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WO2014112765A1 - Dispositif de traitement d'eau d'égout et d'eau usée possédant une unité de rétention de boues activées, et procédé de réduction de la teneur en azote pour eau d'égout et eau usée utilisant ledit dispositif - Google Patents

Dispositif de traitement d'eau d'égout et d'eau usée possédant une unité de rétention de boues activées, et procédé de réduction de la teneur en azote pour eau d'égout et eau usée utilisant ledit dispositif Download PDF

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Publication number
WO2014112765A1
WO2014112765A1 PCT/KR2014/000380 KR2014000380W WO2014112765A1 WO 2014112765 A1 WO2014112765 A1 WO 2014112765A1 KR 2014000380 W KR2014000380 W KR 2014000380W WO 2014112765 A1 WO2014112765 A1 WO 2014112765A1
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Prior art keywords
sludge
activated sludge
sewage
tank
wastewater
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Ceased
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PCT/KR2014/000380
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English (en)
Korean (ko)
Inventor
박정훈
권혁
김창수
김진만
차운오
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TSKWATER CO Ltd
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TSKWATER CO Ltd
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Publication of WO2014112765A1 publication Critical patent/WO2014112765A1/fr
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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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification 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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds

Definitions

  • the present invention provides a sewage and wastewater treatment apparatus having an activated sludge retention unit capable of removing nitrogen contained in sewage and wastewater, in particular, so that the total nitrogen is 5 mg / l or less, preferably 2 mg / l or less. It relates to the nitrogen reduction method of the sewage and wastewater used.
  • sewage and wastewater including municipal sewage, livestock wastewater, agricultural wastewater, and industrial wastewater include nutrients including nitrogen and phosphorus, as well as organic matter, which is a BOD component.
  • nutrients including nitrogen and phosphorus, as well as organic matter, which is a BOD component.
  • the increase of these nutrients destroys the balance of the ecosystem, there is a problem that eutrophication occurs.
  • sewage and wastewater treatment methods are mainly for removing organic substances present in sewage and wastewater, and processes such as pretreatment, primary treatment, secondary treatment, and sludge treatment are used.
  • a biological treatment was performed to remove organic matter.
  • the biological treatment method does not remove nitrogen and phosphorus but has a problem of removing only organic matter.
  • Korean Patent Laid-Open Publication No. 2000-40351 discloses a wastewater treatment method consisting of a flow control tank, a contact tank, a nitrification tank, a phosphorus absorption tank, a phosphorus discharge tank, a treatment tank, and the like.
  • No. discloses a process for simultaneously treating nitrogen and phosphorus using activated sludge (microorganism) in a bioreactor comprising a first aerobic tank, a first precipitation tank, a second aerobic tank, an anaerobic tank, an anaerobic tank and a third aerobic tank.
  • activated sludge adsorbs organic matter, there are problems such as a decrease in sludge sedimentation rate and a need for an apparatus for disposing nitrified activated sludge.
  • the conventional method for treating sewage and wastewater using a membrane process is to treat organic matters such as BOD and COD, stabilize the suspended solids (SS) generated after denitrification, and treat sewage with high concentration.
  • organic matters such as BOD and COD
  • SS suspended solids
  • the total phosphorus content of sewage and wastewater can be reduced to 0.5 mg / l or less by using alkaline sludge for reduction, and at the same time, the total nitrogen content can be reduced to some extent.
  • An object of the present invention is to provide a sewage and wastewater treatment apparatus using alkaline sludge which can reduce total nitrogen to 5 mg / l or less, preferably 2 mg / l or less.
  • Another object of the present invention is to provide a method for reducing nitrogen and phosphorus in sewage and wastewater using the sewage and wastewater treatment apparatus capable of reducing total nitrogen to 5 mg / l or less, preferably 2 mg / l or less.
  • the sewage and wastewater treatment apparatus including the sewage and wastewater storage tank, the bioreactor and the treatment water tank of the present invention for achieving the above object is connected to an alkali compound supply passage and a sludge supply passage, An alkali sludge tank for stirring the sludge to produce alkali sludge, and an alkali sludge transfer passage for transferring the alkali sludge of the alkali sludge tank to a bioreactor;
  • the bioreactor is an anoxic tank for removing and denitrifying organic matter from sewage and wastewater containing nitrogen and phosphorus as inflow water, and changing the dissolved phosphorus in the sewage and wastewater introduced from the anoxic tank into insoluble phosphate to be adsorbed onto activated sludge.
  • a pH control tank to nitrate the inflow water and the activated sludge introduced from the pH control tank, and to separate the activated sludge into a membrane and to treat water;
  • the separation membrane tank includes an activated sludge return passage for conveying some of the activated sludge treated in the separation tank to an oxygen-free tank and an activated sludge discharge passage for discharging some other activated sludge to the outside;
  • Including the tubular activated sludge retention portion which decreases in diameter from the top to the bottom outside or inside the anoxic tank, the activated sludge discharged through the activated sludge return passage to the tubular activated sludge retention portion, respectively, and the sewage and wastewater are respectively supplied. After that, a mixture of activated sludge and sewage and wastewater is settled below the tubular activated sludge retention portion and is supplied to the lower portion of the anoxic tank.
  • the relative volume of the tubular activated sludge retention portion is 10 to 40, preferably 20 to 35.
  • the activated sludge residence time in the tubular activated sludge retention portion is preferably 5 to 20 minutes, preferably 6 to 12 minutes.
  • the relative height of the tubular activated sludge retention portion is preferably between 40 and 65.
  • the tubular activated sludge retention part is formed with an opening on one surface of the outer wall of the anoxic tank, and the tubular activated sludge retention part is installed on the outer wall where the opening is formed so that the lower portion of the tubular activated sludge retention part is in communication with the opening.
  • the tubular activated sludge retention part may be in the form of a plate having both ends coupled to two adjacent outer walls of the anoxic tank and having an open lower portion.
  • the tubular activated sludge retention portion may be in the form of a conical opening with an upper portion and a lower portion.
  • At least one surface of the tubular activated sludge retention portion is preferably an inclined surface at an angle of 10 to 30 degrees from the vertical.
  • the said activated sludge conveyance path is provided so that it may adjoin the said inclined surface.
  • Dissolved oxygen of the activated sludge flowing through the tubular activated sludge retention portion can be reduced by 80 to 99%.
  • the alkali compound may be sodium hypochlorite (NaOCl), calcium hypochlorite (Ca (OCl) 2 ), sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium bicarbonate (NaHCO 3 ), potassium bicarbonate (KHCO 3 ), Consisting of magnesium hydroxide (Mg (OH) 2 ), sodium percarbonate (2Na 2 CO 3 -3H 2 O), calcium hydroxide (Ca (OH) 2 ), calcium oxide (CaO) and magnesium oxide (MgO) It may be one or more selected from the group.
  • the nitrogen and phosphorus reduction method of the sewage and wastewater of the present invention using the above sewage and wastewater treatment apparatus, after mixing the sludge and alkali compounds to produce an alkali sludge, including an anoxic tank, pH control tank and separation membrane tank
  • the activated sludge of the separation membrane tank is supplied to an anaerobic tank through a tubular activated sludge retention unit.
  • Dissolved oxygen of the activated sludge supplied to the anaerobic tank through the tubular activated sludge retention portion can be reduced by 80 to 99%.
  • the alkali sludge is preferably added in an amount of 5 to 40 parts by volume with respect to 100 parts by volume of activated sludge containing the influent of the bioreactor.
  • dissolved oxygen (DO) it is preferable to adjust the dissolved oxygen (DO) to 1 to 20 mg / L to adjust the pH of the pH control tank.
  • the sewage and wastewater treatment apparatus of the present invention and the method for reducing nitrogen and phosphorus in sewage and wastewater using the same are added to the bioreactor by adding an alkali sludge containing an alkali compound mixed with activated sludge to reduce phosphorus in the sewage and wastewater.
  • Phosphorus contained in can be removed and at the same time activated sludge retention can be added to increase the efficiency of nitrogen removal in sewage and wastewater.
  • the total phosphorus (T-P) of the treated water treated according to the present invention is 0.5 mg / l or less, and the total nitrogen (T-P) is 5 mg / l or less.
  • FIG. 1 is a view showing a process flow of a wastewater treatment apparatus according to an embodiment of the present invention.
  • FIG. 2A is a view illustrating an anoxic tank part installed so that the activated sludge retention part of the sewage and wastewater treatment device according to an embodiment of the present invention communicates with an opening of an outer wall of an anoxic tank.
  • FIG. 2B is a view illustrating an anoxic tank part in which an activated sludge retention part in a plate shape having upper and lower portions of a sewage and wastewater treatment apparatus according to an embodiment of the present invention is opened inside the anoxic tank;
  • FIG. 2C is a view illustrating an anoxic tank part in which an activated sludge retention part of a conical shape in which upper and lower portions of a sewage and wastewater treatment apparatus according to an embodiment of the present invention are opened is installed inside an anoxic tank.
  • Figure 2d is a view showing an anoxic tank portion installed in the outer portion of the anoxic tank active sludge retention portion of the conical shape of the upper and lower portions of the sewage and wastewater treatment apparatus according to an embodiment of the present invention.
  • the sewage / wastewater treatment apparatus including the sewage / wastewater storage tank, the bioreaction tank and the treatment water tank of the present invention is connected to the alkali compound supply passage and the sludge supply passage, and the alkali compound and the sludge are stirred by an agitator provided to the alkali sludge.
  • Alkali sludge tank for producing a, and an alkali sludge transport passage for transferring the alkali sludge of the alkali sludge tank to a bioreactor;
  • the bioreactor is an anoxic tank for removing and denitrifying organic matter from sewage and wastewater containing nitrogen and phosphorus as inflow water, and changing the dissolved phosphorus in the sewage and wastewater introduced from the anoxic tank into insoluble phosphate to be adsorbed onto activated sludge.
  • a pH control tank to nitrate the inflow water and the activated sludge introduced from the pH control tank, and to separate the activated sludge into a membrane and to treat water;
  • the separation membrane tank includes an activated sludge return passage for conveying some of the activated sludge treated in the separation tank to an oxygen-free tank and an activated sludge discharge passage for discharging some other activated sludge to the outside;
  • Including the tubular activated sludge retention portion which decreases in diameter from the top to the bottom outside or inside the anoxic tank, the activated sludge discharged through the activated sludge return passage to the tubular activated sludge retention portion, respectively, and the sewage and wastewater are respectively supplied. After that, a mixture of activated sludge and sewage and wastewater is settled below the tubular activated sludge retention portion and is supplied to the lower portion of the anoxic tank.
  • the present invention relates to a sewage and wastewater treatment apparatus using alkaline sludge and a method for reducing nitrogen and phosphorus in sewage and wastewater using the same, characterized in that supplying activated sludge with reduced dissolved oxygen to an anaerobic tank through an activated sludge retention unit.
  • the wastewater treatment apparatus of the present invention includes a bioreactor 100 and an alkali sludge tank 200 for removing phosphorus by adding alkaline sludge to adjust pH.
  • the bioreactor 100 is an apparatus including one or more tanks selected from the anaerobic tank 110, the pH control tank 120 and the separation membrane tank 130, the treatment tank 140 is provided at the rear end of the bioreactor 100 Can be.
  • the alkali sludge tank 200 is provided on one side of the pH control tank 120, but this shows an embodiment of the present invention.
  • the alkali sludge tank 200 is provided as part of the bioreactor in any structure of the bioreactor, preferably provided on one side of any one of the anoxic tank 110, pH control tank 120 and separation membrane tank 130.
  • the alkaline sludge is introduced through the alkali sludge feed passage c.
  • the alkali sludge tank 200 produces an alkali sludge by mixing the alkali compound and the sludge with a stirring device (M) to inject the alkali compound into the sludge.
  • the alkali compound is supplied from the alkali compound supply passage (a) connected to the alkali sludge tank 200, and the sludge is supplied from the sludge supply passage (b) connected to the alkali sludge tank 200.
  • the sludge may be activated sludge returned from any one or more of the anoxic tank 110, the pH control tank 120 and the separation membrane tank 130, or may be a sludge supplied from the outside.
  • the anoxic tank 110 removes organic substances by agitating the sewage, wastewater and activated sludge, which are the incoming water, with the stirring device (M) to feed organic matter present in the sewage and wastewater, and separating membrane tank 130.
  • the nitrified activated sludge returned from is denitrified by inducing denitrification under anoxic conditions and releasing nitrogen gas into the atmosphere.
  • the pH control tank 120 adjusts the pH of the inflow water from which the organic matter and the nitrogen are removed from the oxygen-free tank 110 to form insoluble phosphate by aggregating the divalent and trivalent cations present in the inflow water with the dissolved phosphorus in an alkaline state. Form and insoluble phosphate is adsorbed onto the activated sludge.
  • an alkaline substance derived from an alkali compound collected in the alkaline sludge during air aeration is eluted, thereby reducing the pH to 6.5 to 7.5.
  • the separation tank 130 nitrates the ammonia nitrogen and activated sludge of the influent water introduced from the pH control tank 120.
  • the nitrified influent and activated sludge pass through the immersion membrane, and the treated water passing through the separator is discharged to the treatment tank 140, and some of the activated sludge (activated sludge adsorbed with insoluble phosphate) that does not pass through the membrane. Is returned to the oxygen-free tank 100 along the activated sludge return passage (d) and the other part is discharged to the outside along the activated sludge discharge passage (e).
  • the membrane (Membrane) installed in the separation membrane tank 130 is one or two or more selected from flat membrane, hollow fiber membrane and tubular membrane according to the shape, the pore size of the membrane cartridge filter, MF (Microfiltration) and UF (Ultrafiltration) ) Or two or more kinds thereof may be used.
  • the pH control tank 120 supplies air through an acid pipe to maintain an aerobic state, and adjusts the dissolved oxygen (DO) to 1 to 20 mg / L, derived from the alkali compound collected in the alkaline sludge Alkaline substances can change the elution amount.
  • DO dissolved oxygen
  • the membrane tank 130 also supplies air through the diffuser to maintain the aerobic state, but in general, dissolved oxygen (DO) in the range of 1 to 5 mg / L, to form agitation and water flow, and Air cleaning of the separator can prevent the membrane from clogging.
  • DO dissolved oxygen
  • the treated water tank 140 is introduced into the treated water passing through the separation membrane in the separation membrane tank 130, and processes it to store and discharge the treated water.
  • the sewage / wastewater treatment apparatus including the sewage / wastewater storage tank, the bioreaction tank and the treatment water tank of the present invention is connected to the alkali compound supply passage and the sludge supply passage, and the alkali compound and the sludge are stirred by an agitator provided to the alkali sludge.
  • Alkali sludge tank for producing a, and an alkali sludge transport passage for transferring the alkali sludge of the alkali sludge tank to a bioreactor;
  • the bioreactor is an anoxic tank for removing and denitrifying organic matter from sewage and wastewater containing nitrogen and phosphorus as inflow water, and changing the dissolved phosphorus in the sewage and wastewater introduced from the anoxic tank into insoluble phosphate to be adsorbed onto activated sludge.
  • a pH control tank to nitrate the inflow water and the activated sludge introduced from the pH control tank, and to separate the activated sludge into a membrane and to treat water;
  • the separation membrane tank includes an activated sludge return passage for conveying some of the activated sludge treated in the separation tank to an oxygen-free tank and an activated sludge discharge passage for discharging some other activated sludge to the outside;
  • Including the tubular activated sludge retention portion which decreases in diameter from the top to the bottom outside or inside the anoxic tank, the activated sludge discharged through the activated sludge return passage to the tubular activated sludge retention portion, respectively, and the sewage and wastewater are respectively supplied. After that, a mixture of activated sludge and sewage and wastewater is settled below the tubular activated sludge retention portion and is supplied to the lower portion of the anoxic tank.
  • Sewage / wastewater flows into the anaerobic tank through the wastewater inflow passage with the upper part opened in the air, so oxygen is dissolved while contacting the air, and flows into the anoxic tank immediately without the tubular activated sludge retention section, and the turbulent flow in the upper part of the anaerobic tank. ) Is formed, and oxygen dissolves in contact with air in the air, so that the dissolved oxygen in the upper portion of the anoxic tank rises to about 0.1 to 0.3 mg / L.
  • the tubular activated sludge retention part of the present invention before the microorganism in the activated sludge is introduced into the anoxic tank not only the oxygen of the activated sludge conveyed in the state in which the returned activated sludge is separated from the anoxic tank but also dissolved in the incoming sewage and wastewater.
  • the dissolved oxygen in the anoxic tank can be lowered, and once installed, little maintenance costs are required.
  • activated sludge microorganisms living in aerobic conditions in the separation membrane tank of oxygen dissolved in the sewage and wastewater are suddenly returned and consumed even a small amount of oxygen from the sewage introduced by the oxygen supply is cut off. It is possible to achieve the full consumption of oxygen at.
  • the relative volume of the tubular activated sludge retention part is 10 to 40, preferably 20 to 35, and the residence time in the tubular activated sludge retention part is 2 to 20 minutes, preferably 5 to 15 minutes.
  • the volume of the tubular activated sludge retention portion or the residence time in the retention portion is less than the lower limit, the dissolved oxygen reduction effect and the total nitrogen content reduction effect thereof are not sufficient, and when the upper limit value is exceeded, the effect is no longer effective. Without increase, the volume of sewage and wastewater treatment system becomes large and the treatment time becomes long.
  • the relative height of the tubular activated sludge retention portion is between 40 and 65.
  • the supply of activated sludge through the lower portion of the tubular activated sludge retention portion may not be smooth due to the sludge settled in the lower portion of the anoxic tank, and when the residence time of the activated sludge is less than the lower limit. As a result, the dissolved oxygen reduction effect and the total nitrogen content reduction effect may not be sufficient.
  • the tubular activated sludge retention portion is formed to communicate with the opening of the anoxic tank outer wall of FIG. 2A, or as shown in FIG. 2B, two adjacent end walls of the anoxic tank, for example, both sides of the outer wall contacting at 90 ° are joined and the lower plate is opened. 2C or 2D, the upper and lower conical portions may be opened.
  • the tubular activated sludge retention part may be located outside or inside the anaerobic tank, and when located inside, may be installed in contact with any one or two or more of the outer wall of the anaerobic tank, or may be installed in the middle of the anaerobic tank without contact with the outer wall. have.
  • tubular activated sludge reservoir When the tubular activated sludge reservoir is installed outside the anoxic tank, it is connected to the lower part of the anoxic tank via the dissolved oxygen reducing activated sludge supply passage (f) extending from the lower portion of the tubular activated sludge reservoir.
  • At least one surface of the tubular activated sludge retention portion is preferably an inclined surface at an angle of 10 to 30 degrees from the vertical. If the inclined surface is not possessed, turbulent flow is formed in the upper portion of the tubular activated sludge reservoir while the waste water is supplied, and the dissolved oxygen is sufficiently reduced within the residence time in the volume of the tubular activated sludge reservoir. It is difficult to achieve the problem that the volume or height of the tubular activated sludge retention portion has to be large.
  • the activated sludge conveying passage may be manufactured in the form of a pipe but immersed in the water surface of the tubular activated sludge retention part to suppress the formation of turbulent flow in the upper part of the retention part by supply of the activated sludge.
  • Dissolved oxygen of sewage and wastewater and activated sludge flowing through the tubular activated sludge retention portion can be reduced by 80 to 99%.
  • Alkali sludge of the present invention is prepared by adding an alkali compound to the sludge and mixing them.
  • the alkali sludge is prepared by mixing an alkali compound and a sludge to accumulate an alkali compound in the sludge.
  • the alkali sludge is added to a bioreactor, the alkali sludge is mixed with activated sludge to reduce phosphorus in sewage and wastewater and directly add an alkali compound. Unlike the case, it is not only possible to prevent the killing of microorganisms of activated sludge, but also to easily maintain a constant pH.
  • the time for adding and mixing the alkali compound to the sludge is 2 to 12 hours, preferably 4 to 10 hours.
  • the mixing time is less than 2 hours, the alkali compound is difficult to accumulate in the sludge.
  • the mixing time is more than 12 hours, the alkaline compound is no longer accumulated in the activated sludge and the process time is longer.
  • the alkali compound is added throughout the mixing step.
  • the step of adding the alkali compound to the entire mixing step is preferably a step of stirring while dividing the alkali compound into the sludge 10 to 50 times intermittently, or may be a step of continuously injecting the alkali compound.
  • the concentration of the alkali compound added to the sludge is 1 to 5% by weight, preferably 2 to 4% by weight.
  • concentration of the alkali compound exceeds the upper limit, the sludge that collects the alkali compound is decomposed or solubilized, so that an alkali sludge having a desired volume cannot be obtained, and the phosphorus reduction efficiency is lowered below the lower limit.
  • the step of intermittently adding the alkali compound is a step of repeating the process of injecting the alkali compound for 3 to 8 minutes while stirring the sludge, stopping the injection of the alkali compound and stirring for 8 to 15 minutes 10 to 30 times to be.
  • the mixing process of the sludge and the alkali compound by the intermittent injection of the alkali compound for example, in the preparation of 100L alkaline sludge (based on 0.7% by weight of solids content) with 3% by weight of alkali compound in the alkali compound injection step of 2 to 2 per minute 50 ml, preferably 3 to 20 ml.
  • the input amount of the alkali compound may be adjusted according to the volume of the alkaline sludge to be prepared, the solid content, and the concentration of the alkali compound.
  • the insoluble phosphate may not be formed when the alkali compound is supplied to the bioreactor due to the sludge solubilization, and the alkali compound is not accumulated in the sludge. have.
  • 3% by weight of the alkali compound contained in the alkali sludge is 0.05 to 15% by volume, preferably 0.1 to 10% by volume, more preferably 0.5 to 5, based on the total volume of the alkali sludge (based on 0.7% by weight of solids content). It is added in volume%. Since the input amount of the alkali compound is an input amount of the alkali compound based on the concentration of 3% by weight, when using a concentration other than 3% by weight of the input alkali compound, the input amount of the alkali compound can be adjusted by diluting according to the concentration. have. In addition, if the sludge solid content is out of 0.7% by weight accordingly according to the increase in the content of the sludge solid content is adjusted to increase the content of the alkali compound to be added.
  • the content of the alkali compound in the alkali sludge is less than the lower limit, the desired pH is not obtained, and insoluble phosphate is insufficient to form phosphorus, resulting in low phosphorus reduction efficiency, and when the content is above the upper limit, the activity of the microorganisms in the activated sludge in the bioreactor. To lower the water treatment efficiency of the bioreactor.
  • the pH of the alkali sludge is 7.5 to 8.5, preferably 7.7 to 8.2.
  • the alkalinity is 40 to 60 mg / l.
  • the alkalinity is measured by stirring activated sludge or alkali sludge in a slurry state, for example, a sludge having a solid content of 0.7% by weight at 80 to 150 rpm, and the alkalinity of the alkaline sludge and the activated sludge is in a similar range.
  • the alkalinity of the alkali sludge accumulated in the alkali compound and the alkalinity of the activated sludge appear to be similar because the alkalinity of the liquid phase is measured among the alkaline sludge components in the slurry state, and the alkalinity caused by the injected alkali compound is the inside of the solid sludge.
  • the sludge of the said alkali sludge is not specifically limited as sludge normally used, Preferably it is activated sludge, surplus sludge, the concentrated sludge which concentrated these, or dehydration cake.
  • the activated sludge may be activated sludge returned from a separation membrane tank of a bioreactor or activated sludge generated in another sewage / wastewater treatment apparatus, and excess sludge is sludge generated in a sewage / wastewater treatment apparatus.
  • the concentrated sludge is concentrated by the sludge thickener or gravity sedimentation so that the activated sludge or excess sludge to a solid content of 1 to 5% by weight, the dewatering cake is compressed by pressing the activated sludge, surplus sludge or concentrated sludge with a dehydrator solid content 15 To 25 wt%.
  • the concentrated sludge may be used by diluting 1 to 5 times, but may be used by suspending as it is, and dehydrating cake is used by diluting 3 to 20 times so that cake cakes do not aggregate.
  • the alkali compound is sodium hypochlorite (NaOCl), calcium hypochlorite (Ca (OCl) 2 ), sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium bicarbonate (NaHCO 3 ), potassium bicarbonate (KHCO 3 ), Magnesium hydroxide (Mg (OH) 2 ), sodium percarbonate (2Na 2 CO 3 -3H 2 O), calcium hydroxide (Ca (OH) 2 ), calcium oxide (CaO) and magnesium oxide (MgO) At least one selected from the group consisting of.
  • Alkali sludge thus prepared may be used directly in a state in which an alkali compound is accumulated in the sludge, but may be used by concentrating to 1 to 25% by weight of solid content using a sludge thickener or a dehydrator.
  • the sludge thickener or dehydrator is used to dilute the alkali sludge 3 to 20 times so as not to aggregate into the bioreactor.
  • Alkali sludge is supplied to the bioreactor and used in sewage and wastewater treatment, so that the alkali compounds accumulated in the sludge are eluted little by little and can be used for one to three months.
  • the alkali compound is slowly eluted from the alkali sludge, and the amount of the eluted compound may be increased when the air aeration intensity is enhanced.
  • the alkali sludge is preferably added in an amount of 5 to 40 parts by volume with respect to 100 parts by volume of activated sludge containing the influent of the bioreactor.
  • the present invention provides a method for reducing nitrogen and phosphorus in sewage and wastewater using the alkaline sludge and sewage and wastewater treatment apparatus.
  • the membrane bioreaction process maintains a high concentration of activated sludge and also maintains a sludge residence time (SRT) for high efficiency removal of organic matter and nitrogen.
  • SRT sludge residence time
  • nitrogen removal is efficiently generated by extending the denitrification time.
  • the phosphorus is re-dissolved in the sludge ingesting excess phosphorus has a disadvantage of low treatment efficiency.
  • the method for reducing nitrogen and phosphorus in sewage and wastewater according to the present invention includes preparing an alkali sludge by injecting an alkali compound into the sludge and adding the alkaline sludge to the bioreactor.
  • the pH is adjusted, and divalent and trivalent cations present in the sewage and wastewater aggregate with dissolved phosphorus (PO 4 3- ) in an alkaline state to form scale and aggregate.
  • Insoluble phosphate which is a scale, is adsorbed on activated sludge, so phosphorous does not re-dissolve and it is easy to remove a large amount of phosphorus.
  • the bioreactor includes an anoxic tank, a pH adjusting tank, and a separation membrane tank, wherein alkaline sludge is added to any one of the three tanks at one time, and is evenly distributed through the inner transport passage.
  • the alkaline sludge is added at a time and stays in the bioreactor to slowly elute the alkali compound to adjust the pH of the bioreactor. Therefore, there is no need to continuously add alkaline sludge to control the pH of the bioreactor.
  • the content of alkali sludge added to the bioreactor is 5 to 40 parts by volume, preferably 10 to 35 parts by volume with respect to 100 parts by volume of activated sludge containing the influent of the bioreactor. If the content is less than 5 parts by volume, the cycle for which alkaline sludge should be added is short and does not maintain the desired pH to form insoluble phosphate. If the content is more than 40 parts by volume, the amount of activated sludge present in the bioreactor is This relatively small organic decomposition may not occur.
  • the pH value of the bioreactor added with the alkali sludge is 6.5 to 7.5, preferably 6.7 to 7.3, more preferably 6.8 to 7.2.
  • the pH is less than 6.5, insoluble phosphate is not formed.
  • the pH is greater than 7.5, microorganisms of activated sludge are killed and the total phosphorus of the treated water has a value of more than 0.5 mg / L.
  • the pH is controlled by spontaneous elution by the addition of alkali sludge, and physical adjustment is possible by adjusting the air aeration intensity to the reaction solution of the bioreactor in which the alkali sludge is added.
  • the pH becomes acidic, but in the present invention, since alkali sludge is used, the alkali compound accumulated in the sludge is eluted to the outside to have a pH of 6.5 to 7.5. I can regulate it.
  • dissolved oxygen (DO) of the pH adjusting tank to which the air aeration is added is adjusted to 1 to 20, preferably 1 to 5.
  • Al, Ba, Ca, Cu, Fe, Mg, Mn, Zn, Be, and Sr are divalent and trivalent cations.
  • the divalent and trivalent cations added may be recycled divalent and trivalent cations.
  • the reverse osmosis unit (R / O device) is further provided at the rear of the bioreactor to treat the treated water passing through the bioreactor by the reverse osmosis device (R / O device) material contained in the filtered water ( Divalent and trivalent cations) are recycled to the bioreactor.
  • the water treated with the reverse osmosis device (R / O device) can be used as recycled water.
  • the nitrogen and phosphorus reduction method of sewage and wastewater of the present invention further comprises the step of removing and denitrifying the organic matter of the sewage and wastewater introduced into the bioreactor and / or membrane separation of the activated sludge adsorbed the insoluble phosphate. It may include.
  • the wastewater was treated according to the conditions as shown in Tables 1 and 2 below based on 400 L / day.
  • the alkaline compound was injected into the sludge for 5 minutes at 3.775 ml per minute for 5 minutes and the stirring was repeated for 10 minutes without the injection of the alkaline compound for 6 hours, and the sludge used activated sludge returned from the separation membrane bath.
  • the total volume of the activated sludge and the alkaline sludge of the bioreactor was 131.53 L (the respective volumes contained in the anoxic tank, the pH control tank and the separation tank were 43.94 L, 8.45 L, and 79.14 L, and Comparative Example 1 was tubular activated sludge).
  • the remaining comparative examples 2 and 3 and Examples 1 and 2 are plate-shaped in Fig. 2A, Example 3 is cylindrical in Fig. 2C and Example 4 in Fig. 2D, and the height and volume of each retention part are shown in Table 1 And 2).
  • the pH of the sewage and wastewater introduced into the anoxic tank is 7.0 to 7.5
  • the pH of the alkaline sludge is 7.8.
  • the flat membrane MF used in the membrane tank is a membrane having a pore size of 0.1 to 0.4 ⁇ m prepared in Yuasa.
  • Example 1 Tubular activated sludge retention shape - Plate type Plate type Plate type Height 1) - 20 40 65 DO (mg / L) 2) - 0.18 0.17 0.17 Residence time (min) - 3.34 6.69 10.86 Volume (L) 3) - 3.25 6.50 10.56 Anaerobic MLSS concentration (mg / L) 7240 7030 7150 7110 Alkali sludge injection amount (L) - Internal transfer rate (%) 250 250 250 250 250 Stirring Speed (RPM) 180 180 180 DO (mg / L) 4) 0.18 0.11 0.05 0.00 DO (mg / L) 5) 0.00 0.00 0.00 0.00 ORP (mmV) -141 -185 -201 -254 Retention time (hr) 2.64 2.64 2.64 2.64 Alkali Sludge Tank MLSS concentration (mg / L) 8790 8790 8790 8790 MLSS amount (L) 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33 33
  • the height means the height of the tubular activated sludge retention part when the oxygen free tank height is 100.
  • DO is the dissolved oxygen concentration measured in the upper sample (5 cm depth from the surface) of the tubular activated sludge reservoir.
  • the volume is the relative volume of the tubular activated sludge retention zone when the volume of the anaerobic bath is 100.
  • DO is the dissolved oxygen concentration measured in the anoxic tank upper sample (5 cm deep from the surface).
  • DO is the dissolved oxygen concentration measured in an anaerobic lower layer sample (40 cm deep from the surface).
  • Example 4 Tubular activated sludge retention shape Plate type Conical (inside) Conical (outer) Height 1) 90 50 50 DO (mg / L) 2) 0.17 0.17 0.18 Residence time (min) 15.04 8.36 8.36 Volume (L) 3) 14.63 8.13 8.13 Anaerobic MLSS concentration (mg / L) 7190 7230 7060 Alkali sludge injection amount (L) - - - Internal transfer rate (%) 250 250 250 Stirring Speed (RPM) 180 180 180 DO (mg / L) 4) 0.00 0.00 0.00 DO (mg / L) 5) 0.00 0.00 0.00 ORP (mmV) -260 -241 -244 Retention time (hr) 2.64 2.64 2.64 Alkali Sludge Tank MLSS concentration (mg / L) 8440 8330 8500 MLSS amount (L) 33 33 33 Alkali Chemical Concentration (%) (NaOCl) 3 3 3 Alkali chemical injection amount (m
  • Example 1 Example 2 Influent (mg / L) Treated water (mg / L) Processing efficiency (%) Influent (mg / L) Treated water (mg / L) Processing efficiency (%) Influent (mg / L) Treated water (mg / L) Processing efficiency (%) Influent (mg / L) Treated water (mg / L) Processing efficiency (%) BOD 150.2 1.3 99.1 141.2 1.0 99.3 146.5 1.2 99.2 150.3 1.2 99.2 COD 124.0 6.1 95.1 119.0 5.8 95.1 128.5 5.5 95.7 137.0 5.2 96.2 SS 268.0 0.0 100.0 247.0 0.0 100.0 219.0 0.0 100.0 264.0 0.0 100.0 TN 43.486 5.265 87.9 42.154 4.953 88.3 46.840 4.889 89.6 42.260 3.068 92.7 TP 4.224 0.115 97.3 4.336 0.104 97.6 4.038 0.1
  • Example 4 Influent (mg / L) Treated water (mg / L) Processing efficiency (%) Influent (mg / L) Treated water (mg / L) Processing efficiency (%) Influent (mg / L) Treated water (mg / L) Processing efficiency (%) BOD 148.4 1.0 99.3 140.5 1.2 99.1 153.4 1.0 99.3 COD 127.2 5.1 96.0 131.7 5.4 95.9 135.0 5.0 96.3 SS 241.0 0.0 10000 253.0 0.0 100.0 274.0 0.0 100.0 TN 45.290 2.883 93.6 39.551 3.328 91.6 44.047 3.849 91.3 TP 4.721 0.085 98.2 4.304 0.092 97.9 4.407 0.102 97.7 Total coliform count (pcs / ml) TNTC ⁇ 30 - TNTC ⁇ 30 TNTC ⁇ 30 -
  • bioreactor 110 anoxic tank
  • treatment tank 150 tubular activated sludge retention part
  • alkali compound supply passage b sludge supply passage
  • the sewage and wastewater treatment apparatus of the present invention and the method for reducing nitrogen and phosphorus in sewage and wastewater using the same are added to the bioreactor by adding an alkali sludge containing an alkali compound mixed with activated sludge to reduce phosphorus in the sewage and wastewater.
  • Phosphorus contained in can be removed and at the same time activated sludge retention can be added to increase the efficiency of nitrogen removal in sewage and wastewater.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Activated Sludge Processes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne : un dispositif de traitement d'eau d'égout et d'eau usée utilisant une boue alcaline, une boue activée à teneur réduite en oxygène dissous étant fournie dans un bac anoxique via une unité de rétention de boue activée ; et un procédé de réduction de la teneur en azote et en phosphore pour eau d'égout et eau usée utilisant le dispositif de traitement d'eau d'égout et d'eau usée. Le phosphore contenu dans l'eau d'égout et l'eau usée peut être éliminé par addition, dans un bioréacteur, d'une boue alcaline contenant un composé alcalin qui est mélangée à une boue activée et réduit la teneur en phosphore dans l'eau d'égout et l'eau usée, et, dans le même temps, l'efficacité d'élimination de l'azote contenu dans l'eau d'égout et l'eau usée peut être améliorée par addition de l'unité de rétention de boue activée. Selon la présente invention, la teneur totale en phosphore (T-P) dans l'eau traitée après traitement est inférieure ou égale à 0,5 mg/l et la teneur totale en azote (T-N) est inférieure ou égale à 5 mg/l.
PCT/KR2014/000380 2013-01-15 2014-01-14 Dispositif de traitement d'eau d'égout et d'eau usée possédant une unité de rétention de boues activées, et procédé de réduction de la teneur en azote pour eau d'égout et eau usée utilisant ledit dispositif Ceased WO2014112765A1 (fr)

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CN104261547A (zh) * 2014-10-10 2015-01-07 武汉工程大学 水滑石磁铁矿复合水处理材料
CN105126790A (zh) * 2015-09-06 2015-12-09 河南师范大学 一种同时选择性去除硝酸盐及磷酸盐的复合功能树脂的合成及应用方法
CN115959766A (zh) * 2023-02-07 2023-04-14 广州众行环保科技有限公司 一种活性污泥的分次培养方法
CN116903095A (zh) * 2023-09-11 2023-10-20 山东圣诺实业有限公司 一种碳化硅微粉用废水循环处理装置

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KR101369351B1 (ko) * 2014-01-02 2014-03-04 (주)티에스케이워터 다단형 ｐＨ조절조를 구비한 하·폐수 처리장치 및 이를 이용한 하·폐수의 질소 및 인 저감방법

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CN116903095A (zh) * 2023-09-11 2023-10-20 山东圣诺实业有限公司 一种碳化硅微粉用废水循环处理装置
CN116903095B (zh) * 2023-09-11 2023-12-05 山东圣诺实业有限公司 一种碳化硅微粉用废水循环处理装置

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