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WO2018123647A1 - Dispositif et procédé de traitement de boues activées par séparation membranaire, dispositif et procédé d'alimentation en eau brute - Google Patents

Dispositif et procédé de traitement de boues activées par séparation membranaire, dispositif et procédé d'alimentation en eau brute Download PDF

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Publication number
WO2018123647A1
WO2018123647A1 PCT/JP2017/045049 JP2017045049W WO2018123647A1 WO 2018123647 A1 WO2018123647 A1 WO 2018123647A1 JP 2017045049 W JP2017045049 W JP 2017045049W WO 2018123647 A1 WO2018123647 A1 WO 2018123647A1
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WIPO (PCT)
Prior art keywords
raw water
tank
reaction tank
water
partition plate
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
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PCT/JP2017/045049
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English (en)
Japanese (ja)
Inventor
克輝 木村
進 石田
亮 張
輝美 円谷
太郎 三好
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hokkaido University NUC
Maezawa Industries Inc
Original Assignee
Hokkaido University NUC
Maezawa Industries Inc
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Priority claimed from JP2016254055A external-priority patent/JP6941439B2/ja
Priority claimed from JP2016254064A external-priority patent/JP6941440B2/ja
Application filed by Hokkaido University NUC, Maezawa Industries Inc filed Critical Hokkaido University NUC
Publication of WO2018123647A1 publication Critical patent/WO2018123647A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a membrane separation activated sludge treatment apparatus and a membrane separation activated sludge treatment method capable of efficiently performing nitrogen removal together with membrane separation.
  • the present invention also relates to a raw water supply apparatus and a raw water supply method for supplying raw water to a reaction tank that performs biological treatment such as activated sludge treatment.
  • an activated sludge method in which sewage is introduced into a reaction tank and aerated and stirred together with activated sludge for biological treatment is used.
  • membrane separation is performed by immersing the membrane separation device in the reaction tank and separating the treated water into a membrane.
  • the activated sludge method (Membrane Bioreactor (MBR) method) is frequently used.
  • Patent Documents 1 and 2). As a technology to be realized, a membrane separation activated sludge apparatus and method for aerobic treatment (nitrification treatment) and oxygen-free treatment (denitrification treatment) in a single reaction tank have been proposed (Patent Documents 1 and 2). .
  • an apparatus proposed in Patent Document 1 includes a single reaction tank 1 that performs an aerobic treatment and an oxygen-free treatment, and an immersion membrane separation unit 2 that is disposed inside the reaction tank.
  • the reaction tank 1 is divided into a plurality of compartments by a partition plate 7 provided with a bottom portion spaced apart from the bottom surface of the reaction tank.
  • At least one of the compartments is an aerobic compartment in which the submerged membrane separation unit 2 and the aeration means 4 are arranged, and the remaining compartments are changed from an aerobic state to an anoxic state, and from an anoxic state.
  • a compartment for switching to an aerobic state, and a liquid level control means or a height control means for the partition plate is provided for switching the liquid level in the reaction tank between a state higher and lower than the upper end of the partition plate.
  • Membrane separation activated sludge with partition plate insertion A management device (Baffled Membrane Bioreactor (B-MBR method)).
  • the membrane separation unit 2 is continuously operated under the supply of air from the air diffuser 4 while supplying the sludge mixed liquid containing nitrate nitrogen after nitrification and the air from the inside of the partition plate to the outside. Can be performed or stopped (FIG. 3).
  • an aerobic state and an oxygen-free state can be alternately created in a constant cycle in the partition outside the partition plate, thereby eliminating the need to provide a nitrifying liquid circulation pump and without stopping membrane filtration.
  • nitrification and denitrification can proceed in a single reaction tank.
  • the sewage transfer pump when the anaerobic process is started in the reaction tank, the sewage transfer pump is operated to supply sewage (raw water) to the reaction tank, and the water level in the reaction tank reaches the maximum water level.
  • the raw water is intermittently supplied to the reaction tank by stopping the sewage transfer pump.
  • Patent Document 3 a raw water supply device in which a part of the raw water supply pipe is extended outside the reaction tank and two kinds of valves are provided to remove clogging generated in the raw water supply pipe.
  • Patent Document 3 is a device that removes clogging of the raw water supply pipe while changing the flow path of the raw water by opening and closing the valve, and does not solve the problem of clogging in devices such as pumps and valves. It was. Conventionally, in order to intermittently supply the raw water to the reaction tank, it is necessary to turn the pump on and off at a constant cycle, and there is a problem that the operational load of the raw water pump is large and the pump life is short. Furthermore, since it was necessary to greatly change the operation rate of the pump, it was necessary to overdesign the pump.
  • the present invention provides a membrane separation activated sludge apparatus capable of efficiently denitrifying and further improving nitrogen removal efficiency in a partition plate insertion type membrane separation activated sludge treatment method.
  • An object is to provide a membrane separation activated sludge method and a raw water supply device.
  • the present invention can solve the problem of clogging of equipment such as pumps and valves when supplying raw water intermittently to a reaction tank that performs biological treatment such as activated sludge treatment, and reduces the operating load of the raw water pump.
  • An object of the present invention is to provide a raw water supply device and a raw water supply method that reduce the amount and eliminate the need for excessive pump design.
  • the inventors of the present application have at least a water tank when supplying raw water intermittently to a reaction tank that performs biological treatment. Then, the present inventors have found that the above problem can be solved by using a siphon tube provided so as to extend from the inside of the water storage tank to the outside of the water storage tank through the upper part of the water storage tank wall.
  • a membrane separation activated sludge treatment apparatus having a single reaction tank for performing an aerobic treatment and an oxygen-free treatment, a submerged membrane separation unit disposed in the reaction tank, and an aeration means.
  • the tank is divided into a plurality of compartments by a partition plate provided with a bottom portion separated from the bottom surface of the reaction tank, and at least one of the plurality of compartments is arranged with a submerged membrane separation unit and an aeration means.
  • the membrane separation activated sludge treatment apparatus provided with a liquid level control means for switching between a higher state and a lower state, the liquid level in the reaction tank is lower than the upper end of the partition plate, and the other compartments Is anoxic Come to, membrane separation activated sludge treatment apparatus, characterized in that the liquid level in the reaction tank is provided with a raw water supply means for supplying raw water in an amount not exceeding the upper end of the partition plate to the other compartments in the reaction vessel.
  • a membrane separation activated sludge treatment apparatus having a single reaction tank for performing an aerobic treatment and an oxygen-free treatment, a submerged membrane separation unit disposed in the reaction tank, and an aeration means.
  • the tank is divided into a plurality of compartments by a partition plate provided with a bottom portion separated from the bottom surface of the reaction tank, and at least one of the plurality of compartments is arranged with a submerged membrane separation unit and an aeration means.
  • a membrane-separated activated sludge treatment apparatus which is a section for switching from an aerobic state to an anaerobic state and from an anaerobic state to an aerobic state.
  • the liquid level control means for switching the liquid level in the reaction tank between a state higher and lower than the upper end of the partition plate, and the liquid level in the reaction tank lower than the upper end of the partition plate
  • the other compartments A raw water supply device comprising raw water supply means for supplying raw water in an amount of raw water whose amount in the reaction tank does not exceed the upper end of the partition plate to the other compartment in the reaction tank when in an oxygen state .
  • a raw water supply device for supplying raw water to a reaction tank for biological treatment provided to extend from the inside of the water storage tank to the outside of the water storage tank through the upper part of the water storage tank wall
  • a raw water supply device comprising a siphon tube.
  • the membrane separation activated sludge treatment method for switching the other compartment from an aerobic state to an anaerobic state and from an anaerobic state to an aerobic state the liquid level in the reaction tank When the other compartment is in an oxygen-free state lower than the upper end, an amount of raw water that does not exceed the upper end of the partition plate is supplied to the other compartment in the reaction tank.
  • Membrane separation activated sludge treatment Method for performing an aerobic treatment and an oxygen-free treatment in a single reaction tank in which an immersion membrane separation unit is arranged, wherein the bottom of the
  • a raw water supply method for supplying raw water to a reaction tank that performs biological treatment and is provided so as to extend from the inside of the water storage tank to the outside of the water storage tank through the upper part of the water storage tank wall.
  • the “anoxic state” does not mean only a complete anoxic state but also a state where the oxygen concentration is low enough to reduce nitrate nitrogen to nitrogen molecules by the action of denitrifying bacteria. Used in the meaning of inclusion.
  • a partition plate insertion type membrane separation activated sludge treatment method B-MBR
  • an aerobic state and an anoxic state are alternately created in a constant cycle in a partition outside the partition plate, While aerobic treatment and anaerobic treatment are progressing in the reaction tank, the organic matter necessary for denitrification can be provided efficiently and at low cost in the anaerobic compartment, and denitrification is advanced efficiently and organic
  • the nitrogen removal efficiency from sewage can be improved.
  • the raw water is intermittently supplied from the water tank to the reaction tank at a constant cycle by a simple method of continuously supplying the raw water to the water tank at a constant flow rate using the water tank and the siphon tube. Therefore, it is not necessary to control the flow rate of the raw water supplied to the reaction tank using a pump or a valve. Therefore, the problem of clogging occurring in devices such as pumps and valves can be reduced, the operating load of the raw water pump can be smoothed, and the life of the pump can be extended. In addition, since it is not necessary to change the operating rate of the raw water pump, an excessive design of the raw material pump becomes unnecessary. As a result, the cost can be reduced, and there is an advantage that the maintainability of the entire apparatus is improved.
  • natural water supply apparatus of this invention it is a figure which shows typically the aspect by which raw
  • A It is a figure which shows the liquid level fluctuation
  • B It is a figure which shows the raw
  • C) It is a figure which shows the liquid level fluctuation
  • D It is a figure which shows the raw
  • an immersion type membrane separation unit 2 is provided in a single tank type reaction tank 1.
  • a suction pump 3 is connected to the membrane separation unit 2 outside the reaction tank 1, and an aeration tube 4 for membrane cleaning and aerobic biological treatment is provided below the membrane separation unit 2.
  • the air diffuser 4 is connected to the blower 5, and air (air) is supplied from the blower 5.
  • the reaction tank 1 sludge containing microorganisms is accommodated, and these microorganisms act as organic matter decomposing bacteria, and further as decomposing bacteria of these microorganisms, and perform biological treatment. Therefore, it is preferable that the reaction tank 1 has no corners or irregularities on the inner surface so that sludge is not partially unevenly distributed and oxygen is supplied uniformly. As a result, the temperature and pH of the treatment liquid become uniform in the reaction tank 1, and the decomposition treatment can proceed stably.
  • Microorganisms contained in sludge contribute to the degradation of soluble organic matter such as bacteria, yeasts and fungi including fungi, and are obtained from nature, such as soil, compost, and sludge, by accumulating culture and acclimatization. The It is also possible to isolate and use the main microbial group involved in the degradation from this conditioned solution. In addition, the sludge itself containing these microorganisms is well known in this field.
  • the membrane separation unit immersed in the reaction tank 1 may be one that uses a material that is not easily contaminated as the membrane itself, or one that has an appropriate gap between the membranes so that the surface of the membrane is not easily contaminated.
  • the membrane separation unit 2 may be a module formed using a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane, a reverse osmosis membrane, or the like. From the economical point of view, a module using a microfiltration membrane or an ultrafiltration membrane that has a high filtration rate and can be made compact and is easy to maintain is preferable.
  • the membrane may be a flat membrane, a hollow fiber membrane or the like. The submerged membrane separation unit itself used here is widely used in this field and is also commercially available.
  • sewage is biologically treated in the reaction tank 1, and the air from the air diffuser 4 prevents the sludge substance and the like from adhering to the membrane surface of the membrane separation unit 2.
  • the treatment liquid in the reaction tank 1 can be filtered by the membrane separation unit 2, and the filtered water can be sucked by the suction pump 3 and taken out of the tank.
  • the activated sludge treatment conditions in the reaction tank 1 may be well-known conditions that are usually used in the membrane separation activated sludge method, but the MLSS (Mixed Liquor Suspended Solid) concentration is usually 3000 to 20000 mg / L, preferably 5000 to 15000 mg / L, and HRT (hydraulic residence time) is usually 2 to 24 hours, preferably 4 to 8 hours.
  • MLSS Mated Liquor Suspended Solid
  • HRT hydroaulic residence time
  • the partition plate 7 is connected to a raw water supply device 10 and is provided with a level sensor 6 'and a partition plate 7.
  • the level sensor 6 ' is a sensor for checking the liquid level, that is, the position of the liquid surface, and is well known per se.
  • the partition plate 7 is provided with a bottom portion separated from the bottom surface of the reaction tank.
  • the partition plate 7 surrounds the entire periphery in the lateral direction of the membrane separation unit 2 (upper and lower sides are open), but any partition material that substantially surrounds the periphery of the membrane separation unit 2 may be used.
  • the partition plate 7 may be combined with the tank wall to surround the periphery of the membrane separation unit 2, and is preferably two flat plates that cooperate with the tank wall to define a rectangular region.
  • the partition plate 7 surrounds one surface and the other three surfaces are surrounded by the tank wall, or the partition plate 7 surrounds the entire periphery of the membrane separation unit 2. But you can.
  • such a partition plate divides the inside of the reaction vessel into a plurality of compartments, and at least one of the plurality of compartments is preferably provided with an immersion membrane separation unit and an aeration means.
  • the air compartment is used, and the other compartments are compartments for switching from the aerobic state to the anaerobic state and from the anaerobic state to the aerobic state.
  • the volume ratio of the partition plate (aerobic compartment in which the membrane separation unit 2 is disposed) to the outside (other compartment) is usually 1: 0.5 to 5, preferably 1: 1 to Set to be within the range of 3.
  • the membrane unit accommodating section.
  • the membrane unit in order to increase the processing amount per unit time, the membrane unit is accommodated as desired.
  • a plurality of compartments may be provided, and the membrane unit may be immersed in each of these compartments.
  • the filtration pressure is obtained by the suction pump 3, but even if the filtration pressure is obtained only by the difference between the water level in the reaction tank and the water level at the filtered water outlet, that is, the natural water head.
  • the filtration pressure may be obtained by further applying pressure from the stock solution side.
  • the membrane separation activated sludge treatment apparatus of the present invention has a liquid level control means for switching the liquid level in the reaction tank 1 between a higher state and a lower state than the upper end of the partition plate 7.
  • this liquid level control means By this liquid level control means, the state in which the liquid in both compartments can circulate through the region above the partition plate, and the liquid does not exist above the partition plate, the flow of the liquid in both compartments is divided. A state is created.
  • the membrane separation unit 2 is continuously operated under the supply of air from the air diffuser 4 while supplying the sludge mixed liquid containing nitrate nitrogen after nitrification and the air from the inside of the partition plate to the outside. Can be performed or stopped.
  • an aerobic state and an oxygen-free state can be alternately created in a constant cycle in a partition outside the partition plate, that is, an oxygen-free state can be intermittently formed, and nitrification treatment by nitrifying bacteria And denitrification treatment with denitrifying bacteria can be performed in the same reaction tank.
  • the sewage that has flowed into the sewage treatment facility such as a sewage treatment plant is separated and removed by sand and garbage in the pretreatment facility, and then introduced into the raw water supply device 10 from the raw water tank 9 in FIG. 1 by the raw water pump 8 ′. Then, the raw water supply device 10 is introduced into the reaction tank 1.
  • the feature of the present invention is that when the liquid level in the reaction vessel is lower than the upper end of the partition plate and the partition outside the partition plate is in an oxygen-free state, the liquid level in the reaction vessel does not exceed the upper end of the partition plate.
  • a raw water supply means (hereinafter also referred to as “small amount raw water supply means” for convenience) for supplying a certain amount of raw water to a section outside the partition plate in the reaction tank for a certain period of time, and a raw water supply apparatus having this means.
  • the amount of raw water that is supplied by a small amount of raw water supply means so that the liquid level in the reaction tank does not exceed the upper end of the partition plate is usually that the treatment liquid is filtered by the membrane separation unit 2 and the filtered water is sucked.
  • the flow rate is almost the same as or less than the membrane filtration flow rate taken out of the tank by the pump 3, and the flow rate is almost the same as the membrane filtration flow rate in that the liquid level in the reaction vessel can be kept almost constant.
  • the difference between the flow rate of raw water supplied by the small amount of raw water supply means and the membrane filtration flow rate can be within 20%, preferably within 5% of the membrane filtration flow rate.
  • the fixed time for supplying the raw water by the small amount of raw water supply means may be a time sufficient for the denitrification to proceed in the compartment outside the partition plate in an oxygen-free state, and usually 2 minutes to 30 minutes. Preferably, it is 5 to 10 minutes.
  • FIG. 4 shows a first embodiment of the raw water supply apparatus according to the present invention.
  • the raw water supply device 10 stores a water tank 12 for storing raw water supplied at a constant flow rate from the raw water tank, and stores water from the inside of the water tank 12 through the upper part of the water tank tank wall, preferably the upper end of the water tank tank wall.
  • a siphon tube 13 extending outside the tank 12 is provided.
  • the siphon tube is a curved tube used to raise the liquid once to a high place and move it to a low place by utilizing the property of the liquid that the liquid flows from the high liquid level to the low liquid side. means.
  • the raw water is supplied from the raw water tank to the water storage tank 12 at a constant flow rate, and the raw water is not supplied from the siphon tube to the reaction tank until the water level in the water storage tank 12 reaches the constant water level (raw water stoppage) Step), and when the water level in the water tank 12 reaches a certain water level, that is, the water level corresponding to the portion where the siphon tube 13 bends at the upper end of the water tank 12, almost all the raw water in the water tank is siphoned.
  • the process (raw water supply process) supplied to the reaction tank through the pipe 13 can be repeatedly performed in a constant cycle.
  • the “constant flow rate” is not limited as long as the flow rate is constant at a predetermined time, and may be changed to obtain an optimum flow rate.
  • the full capacity of the water storage tank is usually 0.5 to 30%, preferably 1 to 10% of the reaction tank capacity.
  • the inner diameter of the siphon tube is usually 50 mm or more, preferably 100 mm or more, and more preferably 200 mm or more from the viewpoint of preventing clogging.
  • the position of the end of the siphon pipe extending inside and outside the water storage tank needs to be installed so that the end of the siphon pipe existing outside the water storage tank is lower than the end of the siphon pipe existing inside the water storage tank. .
  • the end part of the siphon tube existing inside the water storage tank is installed at a depth at which a necessary amount of raw water can be supplied to the reaction tank.
  • the siphon tube 13 may be installed independently from the tank wall of the water storage tank 12 as long as it extends from the inside of the water storage tank 12 to the outside of the water storage tank 12 through the upper part of the water storage tank wall. From the viewpoint of space saving and cost reduction, the tank wall of the water storage tank 12 may be integrated.
  • the raw water supply device 10 should be equipped with an emergency stop device and a bypass pipe equipped with a water level sensor that can sense the high water level in the water tank so that it can cope with the case where the siphon tube is blocked and the raw material leaks. Can do.
  • FIG. 5 The manner in which the raw water is supplied to the reaction tank 1 by this raw water supply apparatus 10 is shown in FIG. 5 (from the raw water supply apparatus 10 of FIG. 1 to the reaction tank 1 along the time series (i) to (vi) of FIG. This will be explained with reference to the flow rate fluctuation of the raw water.
  • FIG. 4 (i) t 0 to t 1 (the supply of raw water to the reaction tank is stopped)
  • the raw water is stored in the water storage tank 12 and the water level rises, but until the water level reaches the constant water level, the siphon tube is transferred to the reaction tank.
  • the supply flow rate is controlled using equipment such as a pump and a valve when the raw water is supplied from the raw water supply apparatus to the reaction tank. Even if not, the raw water can be intermittently supplied to the reaction tank in a constant cycle.
  • a raw water pump is used when supplying raw water from the raw water tank to the water storage tank.
  • this pump it is only necessary to continuously supply the raw water to the water storage tank at a constant flow rate.
  • the operating load of the raw water pump is small, and the excessive design of the raw water pump is unnecessary.
  • the apparatus other than the apparatus based on the immersion type membrane separation activated sludge method in which the membrane separation apparatus is immersed in the reaction tank as described above.
  • the apparatus by the membrane separation activated sludge method of an outside tank type or a separate tank type can be used.
  • use devices such as batch activated sludge method (SBR), nitrification denitrification method using double-pipe reactor, and carrier addition activated sludge method. Can do.
  • natural water supply apparatus of this invention is shown in FIG.
  • the raw water supply device 10 ′ of FIG. 6 stores a water storage tank 12 for storing the raw water supplied from the raw water tank, and stores water from the inside of the water storage tank 12 through the upper part of the water tank tank wall, preferably the upper end of the water tank tank wall.
  • a siphon tube 13 (liquid level control means) extending to the outside of the tank 12 and a part of the raw water in the water tank 12 are extracted from a part of the tank wall of the water tank 12, and the water is stored outside the water tank 12.
  • An auxiliary pipe 14 (a small amount of raw water supply means) is provided to supply the side portion of the siphon pipe 13 that is lower than the tank.
  • the water tank 12 when the liquid level in the water tank 12 is a constant water level, that is, when the siphon tube 13 exceeds the water level corresponding to the portion that bends at the upper end of the water tank 12, the water tank All the raw water is intermittently supplied to the reaction tank through the siphon pipe 13, and before all the raw water is supplied to the reaction tank through the siphon pipe 13, a constant flow of raw water is supplied to the reaction tank through the auxiliary pipe 14.
  • the “constant flow rate” is not limited as long as the flow rate is constant at a predetermined time, and may be changed to obtain an optimum flow rate.
  • the full capacity of the water storage tank is usually 0.5 to 20% of the reaction tank capacity, and preferably 2 to 8% of the reaction tank capacity.
  • the dimensions and location of the water storage tank, siphon pipe, and auxiliary pipe can vary depending on the amount of raw water supplied to the reaction tank and fluctuations in the flow rate.
  • the inner diameter of the siphon pipe is usually 50 mm or more in order to prevent clogging.
  • the inner diameter ratio between the auxiliary pipe and the siphon pipe is usually 1: 2 to 10, preferably 1: 2 to 5.
  • the position from the bottom of the water tank to which the auxiliary pipe is coupled is usually set in a range of 20 to 90% of the height from the bottom of the water tank to the top of the siphon pipe, and preferably 40 to 60%. .
  • the siphon tube 13 may be installed independently from the tank wall of the water storage tank 12 as long as it extends from the inside of the water storage tank 12 to the outside of the water storage tank 12 through the upper part of the water storage tank wall. From the viewpoint of space saving and cost reduction, the tank wall of the water storage tank 12 may be integrated. Moreover, it is preferable that the auxiliary piping 14 is couple
  • FIG. 7C liquid level fluctuation in the reaction tank
  • FIG. 7C liquid level fluctuation in the reaction tank
  • FIG. 7C raw water flow rate fluctuation
  • the flow rate of the raw water supplied from the auxiliary pipe 14 to the reaction vessel 1 is a flow rate at which the liquid level in the reaction vessel does not exceed the upper end of the partition plate.
  • a circulation flow that descends and returns to the membrane unit housing section through the region below the partition plate 7 is formed, and the outside of the partition plate 7 is switched from an oxygen-free state to a mostly aerobic state. Further, inside the partition plate in the reaction tank 1, sludge containing a large amount of nitrate nitrogen circulated to the outside of the partition plate in which the ammonia component in the raw water is oxidized to nitrite and nitrate by the action of nitrifying bacteria. .
  • FIG. 6 (v) t t 2 to t 3 (the supply of raw water to the reaction tank is stopped)
  • the interior of the water storage tank 12, the siphon pipe 13 and the auxiliary pipe 14 is in an almost empty state where no raw water is present.
  • the raw water tank 9 continues to be supplied from the raw water tank 9 to the water storage tank 12 at a constant flow rate, the raw water is stored in the water storage tank 12, but until the water level in the water storage tank 12 reaches the auxiliary pipe 14, There is no supply from the auxiliary pipe 14 to the reaction tank 1.
  • the treatment liquid is filtered by the membrane separation unit 2, and the membrane filtration flow rate of the filtrate taken out of the tank by the suction pump 3 and the raw water flow rate supplied to the reaction tank by the auxiliary pipe are substantially the same,
  • the aerobic compartment in which the membrane separation unit is arranged and the other compartments are separated by the partition plate 7.
  • the air from the air diffuser 4 stays in the space surrounded by the partition plate 7, and the region outside the partition plate can be made oxygen-free because air does not circulate.
  • the siphon tube 13 functions as a liquid level control means for the reaction tank.
  • the liquid level in the reaction tank is lower when the liquid level in the reaction tank is lower than the upper end of the partition plate and the partition outside the partition plate is in an oxygen-free state by the auxiliary pipe 14 of the raw water supply apparatus 10 ′.
  • An amount of raw water not exceeding the upper end of the partition plate can be supplied into the reaction tank, and the denitrification performance can be improved. Therefore, in the raw water supply apparatus 10 ′, the auxiliary pipe functions as the small amount raw water supply means.
  • the amount of raw water supplied by the auxiliary pipe is usually equal to or substantially equal to the membrane filtration flow rate that the treated liquid is filtered by the membrane separation unit 2 and the filtered water is taken out of the tank by the suction pump 3. It is preferable that the flow rate is lower than the flow rate, and the flow rate is substantially the same as the membrane filtration flow rate in that the liquid level in the reaction vessel can be maintained almost constant.
  • the difference between the flow rate of raw water supplied by the small amount of raw water supply means and the membrane filtration flow rate can be within 20%, preferably within 5% of the membrane filtration flow rate.
  • the fixed time for supplying the raw water by the small amount of raw water supply means may be a time sufficient for the denitrification to proceed in the compartment outside the partition plate in an oxygen-free state, and usually 2 minutes to 30 minutes. Preferably, it is 5 to 10 minutes.
  • the liquid level in the reaction tank can be increased and lowered in a constant cycle while the liquid level in the reaction tank is reduced. It is lower than the upper end of the partition plate, and when the compartment outside the partition plate is in an oxygen-free state, it becomes possible to supply raw water without increasing the liquid level in the reaction tank, and to improve denitrification performance Can do.
  • raw water can be supplied to the reaction tank with a preferable flow rate fluctuation as shown in FIG. 7 (d). That is, when the liquid level in the reaction tank is lower than the upper end of the partition plate and the compartment outside the partition plate is in an oxygen-free state, the amount of raw water that does not exceed the upper end of the partition plate is reacted. Step of supplying into the tank (FIG.
  • a valve that receives timer control is installed in the siphon pipe 13, and the raw water supply is set to start at an arbitrary time, or a flow rate adjustment valve is installed in the auxiliary pipe 14 to assist. It is also possible to adjust the raw water supply flow rate from the piping. Also controls raw water supply in response to instructions from ORP meter, PH meter, DO meter, NH 4 -N meter, NO 3 -N meter, etc. attached to the reaction tank, raw water tank level, and reaction tank water level.
  • the control device may be attached to the raw water supply device.
  • an emergency stop device equipped with a water level sensor that can sense a high water level and a bypass pipe can be installed so that it can cope with a case where the siphon pipe is blocked and the raw material leaks.
  • the raw water pump 8 is turned on and off to control the liquid level in the reaction tank. Therefore, it is necessary to increase the capacity of the raw water pump sufficiently compared to the membrane filtration pump. As a result, it is necessary to install a larger raw water pump than expected from the amount of treated water, which increases the initial cost. It was. In contrast, with the raw water supply apparatus 10 ′ shown in FIG. 6, it is not necessary to use a large raw water pump, and membrane separation activated sludge treatment can be performed at low cost.
  • the raw water can be continuously supplied to the water storage tank 12 at a constant flow rate by the raw water pump 8 ′ regardless of whether or not the raw water is supplied to the reaction tank 1. it can. Therefore, compared with the case where the raw water pump is operated intermittently, the operation load of the raw water pump can be smoothed and the life of the pump can be extended. Moreover, since there is no need to change the operating rate of the raw water pump, there is an advantage that an excessive design of the raw material pump becomes unnecessary.
  • the apparatus 10 ′ shown in FIG. 6 uses the valves and sensors as described above by operating the liquid level fluctuation in the reaction tank and the fluctuation of the flow rate of the raw water supplied to the reaction tank strictly in advance. Even if it does not have, it has the function to raise and lower the liquid level of a reaction tank by a fixed cycle, and the organic substance required for denitrification can be efficiently provided in an oxygen-free section. In the sewage treatment, organic matter or the like adheres to equipment such as valves and sensors, so that the equipment is damaged quickly. However, by using the apparatus shown in FIG. Maintainability can be improved.
  • FIG. 2 there is an apparatus and a method in which a raw water flow rate control device 11 capable of supplying raw water to the reaction tank 1 with a desired flow rate fluctuation is provided in the front stage of the reaction tank 1.
  • a raw water flow rate control device 11 for example, a level sensor 6 ′′ is used, and in addition to setting a maximum water level detection point as a target water level when supplying a large amount of raw water to overflow the partition plate 7, a reaction tank The water level detection point is set at a position lower than the upper end of the partition plate as a target water level when supplying the raw water in an amount that does not exceed the upper end of the partition plate 7 into the reaction tank 1.
  • the apparatus which controls the operation rate of a pump using, or the apparatus provided with the inverter etc. which control the flow volume of a raw
  • the desirable flow rate fluctuation of raw water supplied to the reaction tank is a flow rate fluctuation as shown in FIG. That is, when the liquid level in the reaction tank is lower than the upper end of the partition plate and the compartment outside the partition plate is in an oxygen-free state, the amount of raw water that does not exceed the upper end of the partition plate is reacted.
  • the raw water is always continuously supplied to the reaction tank at a constant flow rate, and the raw water flow rate and the membrane filtration flow rate are set to be the same, and the upper end of the partition plate is moved up and down.
  • treatment conditions other than those described above and pretreatment of raw water can be performed under the same conditions as those conventionally known, and materials for various tanks and pipes used in the present invention are also conventionally known. Things can be used.
  • the raw water can be intermittently supplied from the water storage tank to the reaction tank at a constant cycle without controlling the flow rate of the raw water by a pump or a valve. Therefore, the problem of clogging occurring in devices such as pumps and valves can be reduced, the operating load of the raw water pump can be smoothed, and the life of the pump can be extended. In addition, an overdesign of the raw water pump is unnecessary, and the maintainability of the entire apparatus is improved.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Activated Sludge Processes (AREA)

Abstract

La présente invention a pour but de fournir : un dispositif de boues activées par séparation membranaire avec lequel il sera possible d'améliorer efficacement la dénitrification et l'efficacité d'élimination d'azote même dans un procédé de traitement de boues activées par séparation membranaire de type à insertion de plaque de séparation ; un dispositif d'alimentation en eau brute ; des procédés utilisant les dispositifs. Pour atteindre ce but, l'invention porte sur un dispositif de traitement de boues activées par séparation membranaire de type à insertion de plaque de séparation pourvu d'un moyen d'alimentation en eau brute, un dispositif d'alimentation en eau brute équipé du moyen d'alimentation en eau brute, et un procédé dans lequel lesdits dispositifs sont utilisés. Ledit dispositif de traitement de boues activées par séparation membranaire possède un unique réservoir de réaction dans lequel un traitement aérobie et un traitement anoxique sont effectués, une unité de séparation membranaire immergée, disposée à l'intérieur du réservoir de réaction, et un moyen d'aération, le dispositif de traitement de boues activées par séparation membranaire de type à insertion de plaque de séparation étant pourvu : d'un moyen de commande de position de liquide pour commuter entre des états dans lesquels la position du liquide à l'intérieur du réservoir de réaction est plus haute ou plus basse que l'extrémité supérieure de la plaque de séparation ; du moyen d'alimentation en eau brute, qui fournit de l'eau brute à une section sur l'extérieur de la plaque de séparation en une quantité telle que la position du liquide à l'intérieur du réservoir de réaction ne dépasse pas l'extrémité supérieure de la plaque de séparation, lorsque la position du liquide à l'intérieur du réservoir de réaction est plus basse que l'extrémité supérieure de la plaque de séparation et que la section sur l'extérieur de la plaque de séparation est dans un état anoxique.
PCT/JP2017/045049 2016-12-27 2017-12-15 Dispositif et procédé de traitement de boues activées par séparation membranaire, dispositif et procédé d'alimentation en eau brute Ceased WO2018123647A1 (fr)

Applications Claiming Priority (4)

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JP2016-254064 2016-12-27
JP2016-254055 2016-12-27
JP2016254055A JP6941439B2 (ja) 2016-12-27 2016-12-27 膜分離活性汚泥処理装置、膜分離活性汚泥処理方法及び原水供給装置
JP2016254064A JP6941440B2 (ja) 2016-12-27 2016-12-27 原水供給装置及び原水供給方法

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US20210395122A1 (en) * 2018-10-17 2021-12-23 Ebara Jitsugyo Co., Ltd. Apparatus and method for biological treatment of organic wastewater
WO2021261543A1 (fr) * 2020-06-26 2021-12-30 国立大学法人北海道大学 Dispositif de traitement des eaux usées, procédé de commande du dispositif de traitement des eaux usées, et programme
WO2022004642A1 (fr) * 2020-06-29 2022-01-06 国立大学法人北海道大学 Dispositif de traitement des eaux usées et procédé de traitement des eaux usées
WO2025110077A1 (fr) * 2023-11-21 2025-05-30 株式会社クボタ Procédé de fonctionnement pour dispositif de traitement des eaux, et dispositif de traitement des eaux

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JP2004261711A (ja) * 2003-02-28 2004-09-24 Yoshikimi Watanabe 膜分離活性汚泥処理装置及び膜分離活性汚泥処理方法
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JPS43552Y1 (fr) * 1965-10-08 1968-01-11
JPS60248294A (ja) * 1984-05-23 1985-12-07 Mitsubishi Kakoki Kaisha Ltd 廃水処理装置
JPS6359396A (ja) * 1986-08-30 1988-03-15 Kankyo Eng Kk 生物学的排水処理方法
JPH04215892A (ja) * 1990-09-03 1992-08-06 Kubota Corp 汚水浄化槽
JPH07275887A (ja) * 1994-04-06 1995-10-24 Toto Ltd 浄化槽
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JP2005279447A (ja) * 2004-03-30 2005-10-13 Kubota Corp 水処理方法および装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210395122A1 (en) * 2018-10-17 2021-12-23 Ebara Jitsugyo Co., Ltd. Apparatus and method for biological treatment of organic wastewater
WO2021261543A1 (fr) * 2020-06-26 2021-12-30 国立大学法人北海道大学 Dispositif de traitement des eaux usées, procédé de commande du dispositif de traitement des eaux usées, et programme
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JP7732731B2 (ja) 2020-06-26 2025-09-02 国立大学法人北海道大学 汚水処理装置、汚水処理装置の制御方法、及びプログラム
WO2022004642A1 (fr) * 2020-06-29 2022-01-06 国立大学法人北海道大学 Dispositif de traitement des eaux usées et procédé de traitement des eaux usées
JPWO2022004642A1 (fr) * 2020-06-29 2022-01-06
JP7702948B2 (ja) 2020-06-29 2025-07-04 国立大学法人北海道大学 汚水処理装置及び汚水処理方法
WO2025110077A1 (fr) * 2023-11-21 2025-05-30 株式会社クボタ Procédé de fonctionnement pour dispositif de traitement des eaux, et dispositif de traitement des eaux

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