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WO2017135762A1 - Système et procédé de traitement pour eau de distribution, utilisant un agent à base de calcium - Google Patents

Système et procédé de traitement pour eau de distribution, utilisant un agent à base de calcium Download PDF

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Publication number
WO2017135762A1
WO2017135762A1 PCT/KR2017/001228 KR2017001228W WO2017135762A1 WO 2017135762 A1 WO2017135762 A1 WO 2017135762A1 KR 2017001228 W KR2017001228 W KR 2017001228W WO 2017135762 A1 WO2017135762 A1 WO 2017135762A1
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WIPO (PCT)
Prior art keywords
water
calcium hydroxide
control signal
raw water
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2017/001228
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English (en)
Korean (ko)
Inventor
박영복
박은희
이진숙
이향연
임헌태
최영준
정득모
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SEOUL METROPOLITAN GOVERNMENT
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SEOUL METROPOLITAN GOVERNMENT
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Priority claimed from KR1020170015420A external-priority patent/KR101805350B1/ko
Publication of WO2017135762A1 publication Critical patent/WO2017135762A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness
    • C02F5/06—Softening water by precipitation of the hardness using calcium compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents

Definitions

  • the present invention relates to a system and a method for treating tap water using a calcium agent, and more particularly, to a system and method for treating tap water using a calcium agent that can generate purified water by injecting carbon dioxide and a calcium agent into a precipitated water just before a filter paper .
  • Water treatment which is the process of improving the water quality of raw water to the purpose of use by using the water of surface water such as river or lake water as its raw water, varies depending on the water quality of the raw water, the use of the water and the watering process, In the case of public water, it is accomplished through sequential processes such as sedimentation, ordinary sedimentation, chemical sedimentation, slow sand filtration, rapid sand filtration and sterilization.
  • the raw water that is first taken for the water is passed through a settling tank, a mixed soil, a coagulating soil, a sedimentation tank, a filter paper, and a cleansing tank.
  • the primary tank is a place where primary water is stored, It is a place where the micro flocs grow big.
  • the sedimentation basin is generally classified into a sedimentation basin which precipitates sediments in a natural state, a medicament sedimentation basin which sediments flocculated sediments through mixing and flocculation steps after the introduction of coagulation medication, a slow sedimentation filter paper, Is generally adopted as a rapid filter paper, and impurities which have not precipitated in the settling paper are reapplied in the filter paper, and after sterilizing chlorine in the disinfection paper, various pathogens are sterilized.
  • Water which is purified through such a multistage process, has a considerable influence on the corrosion of the pipe network depending on the quality of the raw water. Especially when the ripening period and the rainy season are clearly distinguished as in Korea, the coagulant and chlorine , And the generated water is corrosive, so that the water supply and drainage pipes are corroded and the corroded water supply and drainage pipes are changed to water Resulting in tea contamination.
  • Korean Patent No. 10-0495193 discloses a water purification method and apparatus for removing natural organic matter and preventing corrosion of water pipes.
  • the method for introducing carbon dioxide and calcium hydroxide in a water treatment process Comparing the measured pH to the input reference pH; and, if the measured pH exceeds the reference pH, injecting the carbon dioxide gas into the raw water filled in the bath and adjusting the reference pH
  • Korean Patent No. 10-0315306 (registered on November 11, 2001) is an invention relating to a corrosive water quality control system and a method thereof for water treatment to reduce the corrosion of a water pipe line.
  • a carbon dioxide injection means for injecting carbon dioxide so as to generate carbonate ions in response to the slaked liquor supplied from the slaked lime injection means and the slaked lime and the carbon dioxide are supplied from the slaked lime injection means and the carbon dioxide injection means to dissolve
  • a chemical control means for controlling the supply amount of carbonate ions generated by the chemical manufacturing means according to the water quality of the raw water for the drinking water, and a medicine produced by the chemical manufacturing means by an amount corresponding to the control value of the chemical control means, And a medicine feeding means for feeding the medicine to the cleaning paper.
  • the tap water treatment system as described above can have an effect of preventing corrosion by controlling the corrosion of tap water or forming a film on the water pipe by injecting (or injecting) carbon dioxide into the water purification process.
  • calcium hydroxide (Ca (OH) 2 ) is an insoluble substance characterized by an extremely low solubility in water and an inverse solubility in which the solubility decreases with increasing temperature. Therefore, It is difficult to control the water purification process effectively.
  • the lime dissolving technique using the dispersing machine has a problem that it is difficult to apply to the water treatment process continuously operated as a method of dissolving the limestone water by using the tank for controlling the corrosiveness of the corrosive water for the water treatment water.
  • Korean Patent No. 10-0495193 discloses a method of injecting slaked lime similar to the present invention.
  • the lowest turbidity is 1.63 NTU
  • the concentration of calcium hydroxide is 7 ppm
  • the concentration of calcium (Ca 2+ ) is about 3.78 ppm.
  • the drinking water quality standard of the tap water turbidity is less than 0.5 NTU, it is difficult to expect the turbidity reduction effect.
  • the pH is increased to 8.8, so it needs to be improved because it violates the pH water quality standard.
  • Korean Patent Laid-Open Publication No. 10-2010-0054435 discloses a homogenizer.
  • this patent publication relates to a technique applied to purified water, and since the lime water solution is dispersed at 5 to 20%, heat generation and reaction time And 5 to 20% of the solution is mixed with tap water to increase the hardness, which can lead to a change in the taste of the water.
  • water when water is boiled in Korea, it causes a complaint such as calcium carbonate precipitation .
  • more than 5% of the lime water flows into the piping, which may cause clogging of the piping.
  • Korean Utility Model Registration No. 20-0359201 filed on the Korean Register of Water Purification System for Preventing Corrosion of Water Supply Pipes describes a lime lime melting tank for rapidly liquefying lime and treated water and stirring the lime lime with low speed stirring to increase the dissolution rate of lime lime. There is a large difference in the dissolution effect.
  • the turbidity has a value of 1.63 to 2.58, which is insufficient to improve the turbidity.
  • the prior art attempted to improve the turbidity by adding lime water at the same time as the slow stirring, but it did not increase the solubility of calcium hydroxide and did not improve the turbidity to the water quality standard (0.5 NTU or less).
  • an embodiment of the present invention provides a water treatment system including a settling tank, a mixed tank, a coagulating tank, a settling tank, a filter paper and a cleansing tank, A limestone production device for producing less than 5% limestone by injecting slaked lime into the influent; A pH control device for producing raw water in which the pH of the raw water is lowered by injecting carbon dioxide into the raw water to control the pH; A dispersing device for dispersing limestone produced in the limestone production device to produce dispersed limestone; The dispersed limestone produced in the dispersing device and raw water whose pH was controlled in the pH controller were mixed at a ratio of 3 to 5 mL-Ca (OH) 2 / min: 12,000 to 15,000 mL-raw water / min to produce a process water Mixing device; A filtering device for filtering the process water generated in the mixing device; And a disinfecting device for disinfecting and disinfecting the process water filtered in the filtration device.
  • a limestone production device for producing less than 5% limestone by injecting
  • the apparatus for producing lime water includes an influent control valve for controlling an amount of influent water flowing from raw water in accordance with an influent control signal; A calcium hydroxide control valve for controlling the amount of calcium hydroxide injected into the influent in accordance with the calcium hydroxide control signal; A reaction tank for reacting the influent water transferred through the influent water control valve with calcium hydroxide transferred through the calcium hydroxide control valve to produce a lime water and deliver it to the dispersing device; And a control unit which is installed on the lower surface of the reaction tank to measure the weight of the influent water and the weight of the calcium hydroxide, and compares the influent water weight and the preset inflow water weight set value to generate an influent control signal and transmits it to the influent control valve. And a load controller for generating a calcium hydroxide control signal by comparing the predetermined set calcium hydroxide weight value to the calcium hydroxide control valve.
  • the load controller is configured such that the weight ratio of the influent water and calcium hydroxide is set in a range of more than 95 to less than 100: less than 5 to more than 0, more preferably more than 95 to less than 97:
  • the inflow water temperature control signal is generated and transmitted to the inflow water control valve so that the influent water is introduced into the inflow water control valve Off control signal is generated and transmitted to the influent water control valve to block the influent water.
  • the pH control device is characterized in that the pH of the raw water is lowered by 0.3 to 0.5 by injecting carbon dioxide into the raw water.
  • the pH controller includes: a pH meter for measuring pH of raw water; a carbon dioxide control valve for controlling the amount of carbon dioxide injected into the raw water according to the pH control signal; And a pH controller for generating a pH control signal by comparing the pH value of the raw water measured by the pH meter with a predetermined pH target value and delivering the pH control signal to the carbon dioxide control valve.
  • the pH controller may set a pH value lower by 0.3 to 0.5 than the pH value of the raw water measured by the pH meter to a predetermined pH target value, Up control signal to the carbon dioxide control valve when the pH value of the raw water measured by the pH meter is higher than a predetermined pH target value, And the carbon dioxide is delivered to the carbon dioxide control valve.
  • the dispersing device includes a dispersing device for dispersing calcium hydroxide (Ca (OH) 2 ) or calcium carbonate (CaCO 3 ).
  • the mixing apparatus may further comprise: a dispersion limestone produced in the dispersing apparatus and raw water whose pH is controlled by the pH controller is 3 to 5 mL-Ca (OH) 2 / min: 12,000 to 15,000 mL / raw water / min to adjust the pH to 7.0 to 7.3.
  • a dispersion limestone produced in the dispersing apparatus and raw water whose pH is controlled by the pH controller is 3 to 5 mL-Ca (OH) 2 / min: 12,000 to 15,000 mL / raw water / min to adjust the pH to 7.0 to 7.3.
  • the mixing apparatus further comprises: a storage tank for storing dispersed limestone dispersed in the dispersing apparatus; A mixer for mixing the dispersed limescale stored in the storage tank with raw water whose pH is controlled by the pH controller to generate process water; A dispersed limescale control valve for controlling the amount of dispersed limestone mixed in said mixer in accordance with the process water pH control signal; A process water pH meter for measuring the pH value of the process water produced in the mixer; And a process water pH controller for generating a process water pH control signal by comparing the pH value of the process water measured by the process water pH meter with the predetermined target process water pH target value and delivering the process water pH control signal to the dispersed limestone control valve .
  • another embodiment of the present invention provides a method for producing limestone, comprising the steps of: preparing a limestone water for introducing limestone into influent water to prepare limestone; A pH control step for controlling the pH of the raw water by injecting carbon dioxide into the raw water; A dispersing step for dispersing the lime water to produce a dispersed lime water; A mixing step of mixing the dispersed limestone with raw water whose pH is controlled in the pH control step to produce a process water; A filtration step for filtering the process water; And a disinfecting step of disinfecting the filtered process water by injecting a disinfectant into the tap water.
  • the turbidity can be maintained at an average of 0.05 NTU while maintaining the calcium solubility of the process water at the maximum of 40 mg Ca / L, thereby preventing solidification of the lime water and simultaneously dissolving calcium at a high concentration at a high concentration. Therefore, the high solubility of calcium in the process water (pH 7.0) allows the disinfectant to be maintained for 6 times longer than the conventional tap water with a neutral pH of 7.0. Can be increased.
  • carbon dioxide and calcium hydroxide can increase the alkalinity and calcium concentration of the tap water to form a film on the surface of the specimen, thereby reducing the corrosion rate of the water pipe by up to 6 times.
  • FIG. 1 is a view for explaining a tap water treatment system using a calcium agent according to an embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating a method of treating tap water using a calcium agent according to an embodiment of the present invention.
  • FIG. 3 is a graph showing changes in residual chlorine concentration over time of tap water to which a calcium agent is added and conventional tap water according to an embodiment of the present invention.
  • FIG. 4 is a graph showing the results of experiments of tap water with calcium supplementation and conventional tap water in carbon steel pipes according to an embodiment of the present invention.
  • FIG. 5 is a graph comparing weight loss of a carbon steel pipe specimen with tap water added with a calcium agent according to an embodiment of the present invention and conventional tap water.
  • FIG. 6 is a graph showing turbidity analysis results in a conventional tap water.
  • FIG. 7 is a graph showing the results of turbidity analysis in tap water to which a calcium agent is added according to an embodiment of the present invention.
  • first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
  • first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
  • FIG. 1 is a view for explaining a tap water treatment system using a calcium agent according to an embodiment of the present invention.
  • a tap water treatment system 10 using a calcium agent includes a limestone production device 100, a pH control device 200, a dispersion device 300, a mixing device 400, a filtration device 500, Device 600 shown in FIG.
  • the limestone production apparatus 100 injects calcium hydroxide into the influent water flowing from the raw water (or sedimentation water, surface water, ground water, membrane filtration water) subjected to the precipitation process to produce lime water.
  • the apparatus for producing lime water 100 includes an influent control valve 110, a calcium hydroxide control valve 120, a reaction tank 130, and a load controller 140.
  • the inflow water control valve 110 receives the inflow water control signal from the load controller 140 and controls the amount of inflow water flowing from the raw water according to the inflow water control signal.
  • the inflow water control valve 110 receives the inflow instruction control signal from the load controller 140 and opens according to the received inflow instruction control signal so that the raw water (or the settling water) . ≪ / RTI >
  • the inflow water control valve 110 receives the inflow water down control signal from the load controller 140 and is shut off in response to the received inflow water down control signal so that the raw water (or the settling water) Can be blocked.
  • the calcium hydroxide control valve 120 receives the calcium hydroxide control signal from the load controller 140 and controls the amount of calcium hydroxide injected into the influent water in accordance with the calcium hydroxide control signal.
  • the calcium hydroxide control valve 120 is configured to remove calcium hydroxide from the load controller 140 when the agitation of the first agitator (i.e., the valve of the influent control valve 110 is shut off and the inflow of influent water is blocked)
  • the calcium hydroxide can be injected into the inflow water by receiving the control signal.
  • the calcium hydroxide control valve 120 receives the calcium hydroxide up control signal from the load controller 140 and opens according to the received calcium hydroxide up control signal to inject calcium hydroxide as the influent water.
  • the calcium hydroxide control valve 120 receives the calcium hydroxide down control signal from the load controller 140 and is interrupted in response to the received calcium hydroxide down control signal to block the injection of calcium hydroxide.
  • the calcium hydroxide control valve 120 is characterized by regulating the injection of calcium hydroxide so that a lime solution less than 5% calcium hydroxide (Ca (OH) 2 ) is produced. More preferably 3 to 5% of the calcium hydroxide solution is produced.
  • the ratio of the influent water to the calcium hydroxide is adjusted so that the weight ratio is more than 95 to less than 100: less than 5 to more than 0, more preferably more than 95 to less than 97: less than 5 to more than 3, Can be injected.
  • the weight ratio may be a suitable ratio to maintain the taste of conventional tap water.
  • the calcium hydroxide control valve 120 can inject calcium hydroxide into the influent water using air pressure.
  • the calcium hydroxide control valve 120 is formed by placing the position of the calcium hydroxide inlet at a position about 10 cm or more higher than the storage height (i.e., water surface height) of the inflow water (raw water) stored therein to prevent direct contact with the inflow water , It is possible to prevent an accident that some calcium hydroxide precipitates as calcium carbonate in contact with the influent water and blocks the injection port.
  • the reaction tank 130 reacts the influent water delivered through the influent water control valve 110 with the calcium hydroxide delivered through the calcium hydroxide control valve 120 to produce lime water and deliver it to the dispersing device 300.
  • the load controller 140 is installed on the lower surface of the reaction tank 130.
  • the load controller 140 measures the weight of the influent water and the weight of the calcium hydroxide and compares the influent water weight and the preset inflow water weight set value to generate the inflow water control signal, And transmits the calcium hydroxide control signal to the valve 110.
  • the calcium hydroxide control signal is generated by comparing the weight of the calcium hydroxide and the preset weight of calcium hydroxide to transmit the calcium hydroxide control signal to the calcium hydroxide control valve 120.
  • the influent weight setting value and the calcium hydroxide weight setting value are set such that the weight ratio of the influent water and the calcium hydroxide is more than 95 to less than 100: less than 5 to more than 0, more preferably more than 95 to less than 97: do.
  • the load controller 140 measures the influent water weight, generates an influent control signal and transfers it to the influent control valve 110, and measures the weight of calcium hydroxide and generates a calcium hydroxide control signal, (120). That is, the load controller 140 measures the weight of the influent water, and when the inflow water control signal is adjusted to block the inflow of influent water, the load controller 140 measures the weight of calcium hydroxide to generate a calcium hydroxide control signal.
  • the load controller 140 generates an influent water temperature control signal when the influent water weight is lower than a predetermined inflow water weight set value, and transmits the generated inflow water temperature control signal to the influent water control valve 110 .
  • the inflow water control valve 110 receives the inflow water temperature control signal from the load controller 140 and is opened to inflow the inflow water by a set inflow water weight setting value.
  • the load controller 140 generates an influent water off control signal when the influent water weight is greater than a predetermined inflow water weight set value, and sends the generated inflow water off control signal to the influent water control valve 110 .
  • the inflow water control valve 110 is blocked by receiving the inflow water off control signal from the load controller 140, thereby blocking inflow water inflow and maintaining the weight of inflow water by a predetermined inflow water weight setting value.
  • the load controller 140 generates a calcium hydroxide on control signal when the weight of calcium hydroxide is lower than a preset set weight of calcium hydroxide, and transmits the generated calcium hydroxide on control signal to the calcium hydroxide control valve 120 .
  • the calcium hydroxide control valve 120 receives the calcium hydroxide on control signal from the load controller 140 and is opened to inject calcium hydroxide as the influent water by the preset weight of calcium hydroxide.
  • the load controller 140 generates a calcium hydroxide off control signal when the weight of calcium hydroxide is greater than a predetermined set weight of calcium hydroxide, and transmits the generated calcium hydroxide off control signal to the calcium hydroxide control valve 120 .
  • the calcium hydroxide control valve 120 may be intercepted by receiving the calcium hydroxide off control signal from the load controller 140 so as to block the injection of calcium hydroxide and maintain the amount of calcium hydroxide by the preset weight of calcium hydroxide.
  • the load controller 140 may deliver the influent control signal to the first agitator.
  • the apparatus for producing lime water 100 may further comprise a first stirrer.
  • the first stirrer is formed on the upper side of the reaction tank 130 to stir the inflow water stored in the reaction tank 130 and calcium hydroxide.
  • the first stirrer may receive the influent control signal from the load controller 140 to allow the inflow water to be stirred when the inflow water is blocked by the influent control valve 110.
  • the apparatus for producing lime water 100 may further include a dehumidifier so as to be free of moisture when storing calcium hydroxide (i.e., calcium hydroxide).
  • a dehumidifier so as to be free of moisture when storing calcium hydroxide (i.e., calcium hydroxide).
  • the limestone manufacturing apparatus 100 delivers the 3 to 5% lime solution to the lime water storage tank 310 when it is produced.
  • the pH controller 200 controls the pH of the raw water by injecting carbon dioxide into the raw water.
  • the pH control device 200 includes a pH meter 210, a carbon dioxide control valve 220, and a pH controller 230.
  • the pH meter 210 measures the pH of the raw water (or settling water, surface water, ground water, membrane filtration water) subjected to the precipitation process.
  • the carbon dioxide control valve 220 receives the pH control signal from the pH controller 230 and controls the amount of carbon dioxide injected into the raw water according to the received pH control signal.
  • the carbon dioxide control valve 220 receives the pH-up control signal from the pH controller 230 and is interrupted according to the received pH-up control signal to reduce the amount of carbon dioxide injected into the raw water, Can be increased by a predetermined pH target value.
  • the carbon dioxide control valve 220 receives a pH down control signal from the pH controller 230 and is opened in response to the received pH down control signal to increase the amount of carbon dioxide injected into the raw water, To a predetermined pH target value.
  • the carbon dioxide control valve 220 is a mass flow meter that measures the flow rate of carbon dioxide (CO 2 ) and receives a pH control signal from the pH controller 230 to determine the amount of carbon dioxide Can be controlled.
  • the pH controller 230 compares the pH value of the raw water measured by the pH meter 210 with a predetermined pH target value to generate a pH control signal and transmits the pH control signal to the carbon dioxide control valve 220.
  • the pH controller 230 is, for example, a PID controller (i.e., a proportional-integral-derivative controller) that controls the pH value of the raw water by comparing the output value, reference value, can do.
  • a PID controller i.e., a proportional-integral-derivative controller
  • the predetermined pH target value can be set to a value that is about 0.3-0.5 less than the pH value of the raw water.
  • the pH controller 230 sets the predetermined pH target value to pH 6.7 to pH 6.5, or when the pH value of the surface water is 6.0, The value can be set between pH 5.7 and pH 5.5.
  • pH controller 230 pre-set by setting the pH target value to a low value at least 0.3 to 0.5 as long as more than the pH value of the raw water, carbon dioxide (CO 2) increases in the raw water alkalinity and buffering capacity through the injection Thereby controlling the reactivity between raw water and other materials (e.g., materials such as metal, cement, etc.).
  • CO 2 carbon dioxide
  • the pH controller 230 generates a pH-up control signal when the pH value of the raw water measured by the pH meter 210 is lower than a predetermined pH target value, To the carbon dioxide control valve 220. At this time, the carbon dioxide control valve 220 can increase the pH value of the raw water by a predetermined pH target value by reducing the amount of carbon dioxide injected into the raw water by receiving the pH-up control signal from the pH controller 230.
  • the pH controller 230 generates a pH down control signal when the pH value of the raw water measured by the pH meter 210 is higher than a preset pH target value, To the carbon dioxide control valve 220. At this time, the carbon dioxide control valve 220 may receive the pH-down control signal from the pH controller 230 to increase the amount of carbon dioxide injected into the raw water to lower the pH value of the raw water by a predetermined pH target value.
  • the pH controller 230 generates a pH down control signal, for example, by setting the pH target value to 6.9, if the pH value of the raw water measured by the pH meter 210 is higher than 6.9 To the carbon dioxide control valve 220 so that the amount of CO 2 injected can be increased to adjust the pH to a value lower than 6.9.
  • the raw water into which the carbon dioxide is injected is increased in both the buffering capacity and the alkalinity to prevent a sharp rise in pH due to the inflow of calcium hydroxide (Ca (OH) 2 ) or sodium hydroxide (NaOH) have.
  • pH control device 200 and carbon dioxide to control the injection amount of the carbon dioxide from the control valve 220, subjected to precipitation process raw water (or precipitated water, surface water, ground water, membrane filtered water) and carbon dioxide (CO 2 ) can be uniformly mixed at a mass ratio of 10,000 to 15,000: 0.5 to 1.
  • the dispersing device 300 receives the limestone produced in the limestone producing device 100 and disperses the received limestone to produce dispersed limestone.
  • the dispersing device 300 includes a lime water storage tank 310 and a disperser 320.
  • the homo mixer has not been introduced into domestic and foreign water treatment process to produce tap water.
  • the dispersing device is a device for reducing the particle size, and application examples are utilized in the pharmaceutical industry and the cosmetics industry.
  • the particle size of calcium hydroxide is reduced to increase the floating time in water to increase the reaction time with water.
  • the embodiment is shown in the turbidity experiment result.
  • the lime water storage tank 310 receives lime water (that is, lime water in which 3 to 5% of calcium hydroxide (Ca (OH) 2 ) is dissolved) from the lime water producing apparatus 100 (i.e., the reaction tank 130) Stores the limestone produced by the manufacturing apparatus 100, and transfers the stored limestone to the disperser 320.
  • lime water that is, lime water in which 3 to 5% of calcium hydroxide (Ca (OH) 2 ) is dissolved
  • the lime water storage tank 310 may form a location of the lime water injection port at least about 10 cm above the storage height of the internally stored lime water (i.e., the water surface height).
  • the disperser 320 receives calcium hydroxide from the lime water storage tank 310 to disperse calcium hydroxide (Ca (OH) 2 ) (or calcium carbonate (CaCO 3 )).
  • the spreader 320 is rotated at a speed of 12,000 rpm ⁇ 15,000 rpm for about 15 minutes to 20 minutes to disperse the calcium hydroxide (Ca (OH) 2) (or calcium carbonate (CaCO 3)) in the lime water generating a dispersed lime water, and can be passed to produce the lime water and a dispersion of calcium hydroxide (Ca (OH) 2) (or calcium carbonate (CaCO 3)), the mixing device 400 (that is, the storage tank 410)
  • the dispersing device 300 may further comprise a second agitator.
  • the second agitator is formed on the upper side of the lime water storage tank 310 and stirs the lime water stored in the lime water storage tank 310.
  • the second agitator may be able to maintain the homogeneity of the lime water by stirring the lime water.
  • the dispersing device 300 is configured such that the disperser 320 rotates at a speed of from 12,000 rpm to 15,000 rpm to convert calcium hydroxide (Ca (OH) 2 ) (or calcium carbonate (CaCO 3 ) Because it is lighter in weight, it reduces the amount of precipitation and increases the time in water, so it can improve the solubility.
  • Ca (OH) 2 calcium hydroxide
  • CaCO 3 calcium carbonate
  • the turbidity of the tap water can be lowered below 0.05 NTU (less than 0.5 NTU based on water quality), and the water quality equal to or higher than the current turbidity without the injection of lime water can be maintained.
  • the mixing apparatus 400 receives the dispersed limestone and calcium hydroxide (Ca (OH) 2 ) (or calcium carbonate (CaCO 3 )) generated in the dispersing apparatus 300 and controls the pH in the pH control apparatus 200 A raw water is received, and the process is made by mixing the delivered dispersed limestone with the raw water whose pH is controlled.
  • Ca (OH) 2 calcium hydroxide
  • CaCO 3 calcium carbonate
  • the mixing apparatus 400 may include a storage tank 410, a mixer 420, a dispersion limestone control valve 430, a process water pH meter 440, and a process water pH controller 450 .
  • the storage tank 410 receives and stores the dispersed limestone from the dispersing device 300.
  • the storage tank 410 may receive and store calcium hydroxide (Ca (OH) 2 ) (or calcium carbonate (CaCO 3 ) dispersed from dispersed limescale and lime water from the dispersing device 300. At this time , Calcium hydroxide (Ca (OH) 2 ) (or calcium carbonate (CaCO 3 ) is dispersed by the dispersing device 300 to reduce the particle size and become fine particles, thereby increasing the contact area with water, The solubility can be increased.
  • Ca (OH) 2 calcium carbonate
  • CaCO 3 calcium carbonate
  • the mixer 420 mixes the dispersed limescale stored in the storage tank 410 with the raw water whose pH is controlled in the pH controller 200 to generate the process water.
  • the mixer 420 is configured to provide 3-5% dispersed lime water (i.e., Ca (OH) 2 Solution) and the mixture ratio of the raw water pH control (i.e., CO 2 was dissolved in the raw water) 3 ⁇ 5 mL-Ca ( OH) 2 / min: 12,000 ⁇ 15,000 to raw water mL- / min, the dispersed lime water with pH It is preferable to mix the controlled raw water.
  • 3-5% dispersed lime water i.e., Ca (OH) 2 Solution
  • the mixture ratio of the raw water pH control i.e., CO 2 was dissolved in the raw water
  • 3 ⁇ 5 mL-Ca ( OH) 2 / min 12,000 ⁇ 15,000 to raw water mL- / min
  • the dispersed lime water with pH It is preferable to mix the controlled raw water.
  • the dispersion limestone control valve 430 receives the process water pH control signal from the process water pH controller 450 and controls the amount of dispersed limestone mixed in the mixer 420 according to the received process water pH control signal .
  • the dispersed limestone control valve 430 receives a process water pH down control signal from the process water pH controller 450 and is shut off in response to the received process water pH down control signal, The pH value of the process water can be lowered.
  • the dispersed limescale control valve 430 receives the process water pH up control signal from the process water pH controller 450 and opens according to the received process water pH up control signal to inject dispersed limescale water
  • the pH value of the process water can be increased.
  • the process water pH meter 440 measures the pH value of the process water produced in the mixer 420.
  • the process water pH controller 450 compares the pH value of the process water measured by the process water pH meter 440 with the predetermined process water pH target value to generate a process water pH control signal, .
  • the process water pH controller 450 generates a process water pH down control signal when the pH value of the process water measured by the process water pH meter 440 is higher than a predetermined process water pH target value And transmit the generated process water pH down control signal to the dispersed limestone control valve 430.
  • the process water pH controller 450 generates a process water pH up control signal when the pH value of the process water measured by the process water pH meter 440 is lower than the predetermined process water pH target value And may transmit the generated process water pH-up control signal to the dispersed limescale control valve 430.
  • the process water pH controller 450 is a PID controller (i.e., a proportional-integral-differential controller) that compares the output value, reference value, Can be controlled.
  • PID controller i.e., a proportional-integral-differential controller
  • the process water pH controller 450 may set the predetermined process water pH target value to, for example, pH 7.0 to pH 7.3 so that the process water pH value is maintained at pH 7.0 to pH 7.3 .
  • the mixing apparatus 400 may further include a third stirrer.
  • the third stirrer is formed on the upper side of the storage tank 410 and stirs the dispersed limestone stored in the storage tank 410.
  • the third agitator is capable of preventing precipitation of 3-5% of dispersed limescale by stirring calcium hydroxide and dispersed limescale.
  • the filtration apparatus 500 receives the process water generated in the mixing apparatus 400 and filters the received process water.
  • the filtration apparatus 500 includes a water tank 510 for storing the process water generated in the mixing apparatus 400, and a water tank 510 formed inside the water tank for filtering the process water stored in the water tank And a filtration layer 520.
  • the filtration apparatus 500 allows the process water to be filtered through the filtration layer 520 to maintain the turbidity of the process water below 0.1 NTU to obtain clean calcium-fortified tap water .
  • the filtration apparatus 500 is a sand filtration apparatus, and the filtration layer 520 may be a sand bed.
  • the sand layer can be formed by forming sand on the upper part and forming a gravel layer on the lower part to filter the process water.
  • the filtration apparatus 500 is a membrane filtration apparatus, and the filtration layer 520 may be a filtration membrane. That is, a filtration membrane may be formed in the water tank to filter the process water.
  • the disinfecting apparatus 600 receives the filtered process water from the filtration apparatus 500, and inserts and disinfects the disinfectant into the received process water.
  • disinfection device 600 may include disinfectant injector 610, process water storage tank 620.
  • the disinfectant injector 610 receives the filtered process water from the filtration device 500 and injects disinfectant into the received process water to disinfect it.
  • the disinfecting agent can be chlorine or sodium hypochlorite.
  • the process water storage tank 620 stores the process water disinfected by the disinfectant injector 610.
  • the disinfection device 600 may be adapted to maintain the pH of the process water (i.e., purified water) at pH 6.8 to pH 7.3, which is the current water quality range, by disinfecting the process water with a disinfectant.
  • a disinfectant In the United States, where alkalis (NaOH, Ca (OH) 2 ) is injected to prevent corrosion of tap water, pH is maintained at about 8.0 or higher, and Japan at 7.5. Therefore, if the present technology is used in the United States, Japan, etc., the pH can be lowered while using calcium hydroxide, thereby increasing the disinfection effect.
  • the budget can be reduced by reducing the amount of the alkaline agent and the disinfectant which raise the pH, It is possible to eliminate obstacles such as the removal of calcium hydroxide lumps.
  • HOCl and OCl - reach equilibrium at the pH of the process water at 7.5, When the pH is 7.5 or less, a large amount of HOCl is produced. When the pH of the process water is 7.5 or more, a large amount of OCl - can be produced. That is, chlorine is a very strong oxidant for all metals and organic matter.
  • a disinfectant i.e., chlorine (Cl 2 )
  • FIG. 2 is a flowchart illustrating a method for treating tap water using a calcium agent according to another embodiment of the present invention.
  • a method for treating tap water using a calcium agent includes a step (S100) of preparing a lime water; pH control step S200; Dispersion step S300; Mixing step S400; Filtering step S500; And sterilizing step S600.
  • the limestone production apparatus 100 is introduced from the raw water (or sedimentation water, surface water, ground water, membrane filtration water) subjected to the precipitation process, and calcium hydroxide is injected into the influent water to produce limestone.
  • the limestone production step S100 is a step in which the inflow water is introduced into the reaction tank 130 by the weight of the predetermined influent water from the inflow water control valve 110 and then the calcium hydroxide control valve 120 Calcium hydroxide can be introduced into the limestone as much as the set weight.
  • the pH controller 200 controls the pH of the raw water by injecting carbon dioxide into raw water (or sedimentation water, surface water, ground water, membrane filtration water) subjected to the precipitation process.
  • the pH control step (S200) can control the pH value of the raw water by injecting carbon dioxide equivalent to a predetermined pH target value from the carbon dioxide control valve 220 into the raw water subjected to the precipitation process.
  • the dispersing apparatus 300 disperses the limestone produced in the above-described step S100 to generate dispersed limestone (S300).
  • the dispersing step S300 is a step of dispersing limestone (i.e., lime (Ca (OH) 2 ) dissolved in an amount of 3-5% from the lime water producing apparatus 100 (i.e., the reaction tank 130) It may be delivered to the dispersing unit 320 and dispersed.
  • limestone i.e., lime (Ca (OH) 2
  • the lime water producing apparatus 100 i.e., the reaction tank 130
  • the mixing apparatus 400 mixes the dispersed limestone produced from the dispersing apparatus 300 and the raw water whose pH value is controlled from the pH control apparatus 200 in the above-described step S200 in the above-described step S300 to generate the process number (S400 ).
  • the mixing step S400 is a step of mixing the dispersed limestone and the raw water whose pH value has been controlled by the dispersed limestone control valve 430 by the predetermined process water pH target value into the mixer 420 .
  • the filtration apparatus 500 injects and filters the process water generated in step S400 (S500).
  • the disinfecting apparatus 600 injects the disinfectant into the process water filtered in the step S500 to sterilize the process water (S600).
  • raw water (river water) reaches the water purification plant, and coagulant is injected at the water purification plant, and then water subjected to the precipitation process is used as the raw water of the demonstration plant.
  • Carbon dioxide was injected into the raw water (pH 7.0 ⁇ 7.3) to lower the pH to 6.8 ⁇ 6.5, and 3 ⁇ 5% Ca (OH) 2 dispersed with lime water was injected and dissolved and sand filtered.
  • Water added with 0.5 mg / L disinfectant (sodium hypochlorite) in the condition is calcium-added tap water used in the system.
  • Conventional tap water refers to tap water in which carbon dioxide and lime water are not injected in this process.
  • Table 1 shows the change in residual chlorine concentration measured while circulating conventional tap water and calcium-containing tap water for 60 minutes using an aged carbon steel pipe at a water temperature of 36.5 ° C.
  • the initial chlorine concentration of conventional tap water is 0.40 mg / L and the initial chlorine concentration of calcium-added tap water is 0.24 mg / L.
  • the above results show that the calcium-added tap water can maintain the disinfectant duration for about 6 times longer even though a little chlorine is administered.
  • calcium-added tap water can achieve equal or better effects by injecting the chlorine concentration at the water purification plant by a factor of 1/2 less than the current concentration. As a result, it is possible to simultaneously obtain the effect of inhibiting the formation of chlorine ions and inhibiting the lowering of the pH of water, by inhibiting the formation of iron oxide (greenhouse) by blocking the oxidation reaction with the metal, Inactivation can effectively occur.
  • Equation (1) the case where the formula is a first-order reaction depending on the reaction in which any of the reactants A are consumed is shown in Equation (1). (- r A : Consumption rate of reactant A, t : time, k : rate constant, C A : concentration of A after elapse of time)
  • the results of analysis of the residual chlorine reaction rate in conventional tap water and calcium-added tap water by aged carbon steel pipe corrosion control agent are shown in Table 2.
  • the linearity was 0.9794 and 0.9919, respectively, .
  • the reaction rate constant (k) in the first reaction shows the slope value in the reaction time and reactant concentration graph.
  • the k value was 0.178 and the k value in the calcium added tap water was 0.025.
  • the slope of the slope was 7.12 times faster than that of the calcium - added tap water, and it can be proved that the residual chlorine concentration value in the conventional tap water is rapidly decreased.
  • the time is predicted until the residual chlorine concentration reaches 0.05 mg / L by using the first reaction rate formula for the residual chlorine concentration obtained in the carbon steel pipe corrosion test.
  • Conventional tap water has a residual chlorine concentration of 0.05 mg / L after 11.2 minutes in the carbon steel pipe, and a time of 64.2 minutes after reaching the residual chlorine concentration of 0.05 mg / L in the calcium added tap water.
  • the duration of residual chlorine can be maintained at 5.7 times longer than in the water pipe.
  • FIG. 3 is a graph (x axis: time (minutes), y axis: residual chlorine concentration) showing changes in residual chlorine concentration with time of tap water to which a calcium agent is added and conventional tap water according to an embodiment of the present invention.
  • Carbon steel pipe corrosion test was performed by immersing in tap water and calcium additive prepared in the conventional process for about 6 months to measure weight loss and corrosion rate.
  • the water quality of conventional tap water was pH 7.0, alkaline degree 55 mg / L as CaCO 3 , and Ca 21.6 mg / L.
  • the water quality of calcium added tap water was pH 7.1, alkaline degree 82 mg / L as CaCO 3 and Ca 31.1 mg / L.
  • FIG. 4 is a graph showing the results of experiments using conventional tap water and tap water produced by one embodiment of the present invention (hereinafter referred to as calcium-added tap water) in a carbon steel pipe.
  • FIG. 5 is a chart comparing the weight loss of carbon steel pipe specimens in conventional tap water and tap water produced by one embodiment of the present invention (hereinafter referred to as calcium-added tap water).
  • weight loss results are shown in FIG. 5 as a result of an experiment of carbon steel pipe specimens of conventional tap water and calcium-containing tap water.
  • a water pipe is formed as a coated steel pipe
  • the inner and outer portions of the coated steel pipe are coated with a polymer material in order to prevent corrosion.
  • the inner coating material is peeled off by the welding, Carbon steel is exposed to tap water. Localized corrosion caused by tap water in exposed parts may lead to accidents such as leakage and road depression, but it is possible to prevent local corrosion and rust by using calcium added tap water.
  • a water pipe when a water pipe is formed of a cement lining ductile cast iron tube, water can penetrate because the cement lining is not completely waterproof, and heavy metals such as iron, lead, copper, and cadmium may exist in the cement material have. At this time, if the heavy metal is corroded, the water pipe may leak out in the form of ion and cause secondary pollution of tap water.
  • calcium-containing tap water can effectively prevent corrosion of cement lining ductile cast iron pipe cement material and cast iron pipe.
  • the turbidity change according to the calcium concentration was analyzed through repeated experiments with tap water and tap water produced by one embodiment of the present invention (hereinafter, referred to as calcium-added tap water). Since the experiment period is 6 months, the water quality of the process water entering the plant is slightly different every day. Especially when the rain is heavy, the pH is lowered to below 6.8, and the calcium concentration in the process water is 15 mg / L or less There were also times. In the process operation, the carbon dioxide is automated to be injected when the pH is above 6.8, and the calcium hydroxide is operated so that 3 to 5% solution is dispersed and injected at 3 to 5 mL / min.
  • FIG. 6 is a graph showing turbidity analysis results in conventional tap water
  • FIG. 7 is a graph showing turbidity analysis results in tap water produced by one embodiment of the present invention (hereinafter referred to as calcium-added tap water).
  • the concentration of calcium ions in conventional tap water is 25 to 10 mg / L and the turbidity is 0.1 NTU or less.
  • the calcium added tap water could increase the calcium concentration up to 40 mg / L, and the turbidity was 0.04 NTU.
  • carbon dioxide and a calcium agent can be injected into raw water (that is, precipitated water after a precipitation process) It is possible to prevent the corrosion of the water and sewerage facilities and prolong the service life.
  • the pH controller 200 controls the pH of the raw water by injecting carbon dioxide into the raw water delivered in the precipitation step, and at the same time, the calcium hydroxide is injected into the influent water from the limestone manufacturing apparatus 100 to produce lime water, 400), so that a dissolution technique using a calcium agent is possible in a pH range of 6.7 to 6.9.
  • the embodiment of the present invention is not limited to the above-described apparatus and / or method, but may be implemented by a program for realizing a function corresponding to the configuration of the embodiment of the present invention and a recording medium on which the program is recorded And the present invention can be easily implemented by those skilled in the art from the description of the embodiments described above.

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Abstract

La présente invention concerne un système et un procédé de traitement pour eau de distribution, utilisant un agent à base de calcium, dans lesquels du dioxyde de carbone et l'agent à base de calcium sont ajoutés à de l'eau post-sédimentation en ligne avant un bassin de filtration pour produire de l'eau purifiée. Le système de traitement pour eau de distribution, utilisant un agent à base de calcium comprend : une unité de préparation d'eau de chaux pour injecter de la chaux éteinte dans de l'eau entrante s'écoulant depuis l'eau brute qui a été traitée dans un bassin de décantation, pour préparer de l'eau de chaux; une unité d'ajustement de pH pour diminuer le pH de l'eau brute par injection de dioxyde de carbone dans l'eau brute de façon à préparer de l'eau brute ajustée en pH; une unité de dispersion pour disperser l'eau de chaux préparée dans l'unité de préparation d'eau de chaux pour produire de l'eau de chaux dispersée; une unité de mélange pour mélanger l'eau de chaux dispersée produite dans l'unité de dispersion et l'eau brute ajustée en pH dans l'unité d'ajustement de pH à un rapport de 3 à 5 ml Ca(OH)2/min : 12 000 à 15 000 ml eau brute/min pour produire de l'eau de traitement; une unité de filtration pour filtrer l'eau de traitement produite dans l'unité de mélange; et une unité de désinfection pour désinfecter l'eau de traitement filtrée dans l'unité de filtration par injection d'un désinfectant dans celle-ci.
PCT/KR2017/001228 2016-02-03 2017-02-03 Système et procédé de traitement pour eau de distribution, utilisant un agent à base de calcium Ceased WO2017135762A1 (fr)

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CN108358360A (zh) * 2018-03-22 2018-08-03 齐鲁工业大学 一种可以实现造纸废水降解的高效处理系统
CN109289613A (zh) * 2018-11-11 2019-02-01 方祥杰 一种石灰水搅拌桶防堵塞方法
CN110156213A (zh) * 2019-06-17 2019-08-23 国家能源投资集团有限责任公司 污水的处理方法及处理系统
CN110330150A (zh) * 2019-08-19 2019-10-15 过蕊 一种污水处理设备

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CN109289613A (zh) * 2018-11-11 2019-02-01 方祥杰 一种石灰水搅拌桶防堵塞方法
CN110156213A (zh) * 2019-06-17 2019-08-23 国家能源投资集团有限责任公司 污水的处理方法及处理系统
CN110330150A (zh) * 2019-08-19 2019-10-15 过蕊 一种污水处理设备
CN110330150B (zh) * 2019-08-19 2021-10-22 安徽恒信通智能科技有限公司 一种污水处理设备

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