WO2017163340A1 - Procédé de traitement des eaux usées et appareil de traitement des eaux usées - Google Patents

Procédé de traitement des eaux usées et appareil de traitement des eaux usées Download PDF

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Publication number
WO2017163340A1
WO2017163340A1 PCT/JP2016/059210 JP2016059210W WO2017163340A1 WO 2017163340 A1 WO2017163340 A1 WO 2017163340A1 JP 2016059210 W JP2016059210 W JP 2016059210W WO 2017163340 A1 WO2017163340 A1 WO 2017163340A1
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treatment
separation membrane
wastewater
clogging
activated sludge
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PCT/JP2016/059210
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English (en)
Japanese (ja)
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和之 田口
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富士電機株式会社
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Priority to CN201680078115.XA priority Critical patent/CN108602703A/zh
Priority to PCT/JP2016/059210 priority patent/WO2017163340A1/fr
Publication of WO2017163340A1 publication Critical patent/WO2017163340A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • 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
    • 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 wastewater treatment method and a wastewater treatment apparatus for treating wastewater containing organic matters such as domestic wastewater and industrial wastewater by activated sludge treatment and membrane filtration.
  • wastewater containing organic matter is introduced into the treatment tank and treated with activated sludge to remove organic matter etc., and then reverse osmosis membrane, ultrafiltration membrane, microfiltration membrane, hollow fiber membrane, etc.
  • a membrane separation activated sludge method (MBR: Membrane BioReactor) is known in which a membrane module equipped with a separation membrane is passed through and subjected to filtration treatment of suspended microorganisms and other suspended substances (abbreviated as SS) for solid-liquid separation. ing. Since the membrane separation activated sludge method performs solid-liquid separation using a membrane module, the final sedimentation basin can be omitted and the apparatus can be downsized.
  • the separation membrane is clogged due to the gradual accumulation of suspended microorganisms and other suspended substances (SS), etc., on the membrane module over a long period of operation.
  • SS suspended microorganisms and other suspended substances
  • the separation membrane must be finally replaced. If the replacement interval is short, continuous operation is hindered, and the cost for the replacement is high.
  • the main cause of such clogging of the separation membrane is a deposit containing a glycoprotein produced by microorganisms in activated sludge (adhesive property) that exhibits strong adhesion that cannot be removed even by bubbling or backwashing. Including microorganisms and their debris).
  • Patent Document 1 a small animal having an excellent ability to prey on dispersible bacteria that cause clogging of the separation membrane is introduced into the treatment tank to enhance its feeding effect. Therefore, there is an attempt to solve the problem of clogging of the separation membrane.
  • Patent Document 2 there is an attempt to solve the problem of clogging of the separation membrane by providing microorganisms that can reduce or prevent the formation of biofilms that cause clogging to the separation membrane. .
  • the sludge used for such activated sludge treatment is mainly a microorganism in the reaction tank, and is an agglomeration of microorganisms grown using organic matter in the wastewater as a substrate. For this reason, the activated sludge treatment purifies organic matter in the wastewater, and the sludge generation amount increases accordingly.
  • the microorganisms present in the reaction tank are not in a closed system treatment in which no microorganisms are mixed from the outside, and microorganisms that exist universally in the natural world are always mixed. Therefore, there are a wide variety of microorganisms involved in biological treatment and have various characteristics and functions. Therefore, the microorganisms that predominate in the reaction tank by the wastewater to be treated are also different.
  • JP 2007-260664 A Special table 2013-510710 gazette Japanese Patent No. 4826982 International Publication No. 2011/136188
  • an object of the present invention is to provide a wastewater treatment method and a wastewater treatment apparatus capable of extending the life of a separation membrane with little influence on the original activated sludge treatment environment in the membrane separation activated sludge method.
  • the wastewater treatment method of the present invention introduces wastewater containing organic substances into a treatment tank to perform activated sludge treatment, and discharges wastewater after activated sludge treatment with a separation membrane installed in the treatment tank.
  • the activated sludge treatment is performed in the treatment tank, and the treated water is taken out by solid-liquid separation of the wastewater after the activated sludge treatment with a separation membrane installed in the treatment tank.
  • a tank is not required, and the apparatus configuration can be simplified.
  • the microorganisms that improve the clogging state of the separation membrane are dominated, and the microorganisms are activated according to the clogging state of the separation membrane, so the clogging of the separation membrane is performed at the desired timing. It can be eliminated, and at least during the period other than the activation process of the microorganism, the inside of the treatment tank can be set in an environment suitable for the activated sludge treatment. Therefore, the life of the separation membrane can be extended with little influence on the original activated sludge treatment environment.
  • the microorganism it is preferable to activate the microorganism when an index indicating the clogged state of the separation membrane exceeds a predetermined threshold. According to this, the clogging of the separation membrane can be eliminated at a desired timing at a more accurate time based on the clogging state of the separation membrane.
  • the index indicating the clogged state of the separation membrane is the water pressure of the treated water solid-liquid separated by the separation membrane, and when the water pressure value falls below a predetermined value, It is preferable to activate the microorganism. According to this, the clogging state of the separation membrane can be easily monitored, and the clogging of the separation membrane can be resolved at a desired timing at a more accurate time.
  • the microorganism that improves the clogging state of the separation membrane preferably includes a microorganism that secretes at least a proteolytic enzyme or a carbohydrate degrading enzyme outside the cell. According to this, even a deposit containing a glycoprotein that exhibits strong adhesion that cannot be peeled off even by bubbling or backwashing can be decomposed and purified to extend the life of the separation membrane. it can.
  • the activation treatment of the microorganism includes a treatment for increasing a proteolytic enzyme and / or a carbohydrate degrading enzyme secreted by the microorganism outside the cell. According to this, even if it is a deposit containing a glycoprotein that shows strong adhesion so as not to be peeled off even by bubbling or backwashing by such activated microorganisms, it is decomposed and purified, The life of the separation membrane can be extended.
  • the microorganism activation treatment preferably includes a treatment of adding an iron compound and / or a magnesium compound to the wastewater treated with activated sludge in the treatment tank.
  • a treatment of adding an iron compound and / or a magnesium compound to the wastewater treated with activated sludge in the treatment tank.
  • the activation treatment of the microorganism includes a treatment of adding a silicon compound to wastewater to be treated with activated sludge in the treatment tank.
  • the growth of microorganisms is activated by the added silicon compound, and the proteolytic enzymes and carbohydrate-degrading enzymes secreted by the microorganisms increase accordingly, eliminating clogging of the separation membrane at the desired timing. can do.
  • the clogged state of the separation membrane it is preferable to measure the clogged state of the separation membrane after backwashing or bubbling the separation membrane. According to this, the clogged state of the separation membrane can be monitored more accurately.
  • the wastewater treatment apparatus of the present invention introduces wastewater containing organic substances into a treatment tank to perform activated sludge treatment, and solid-liquid separates the wastewater after activated sludge treatment with a separation membrane installed in the treatment tank.
  • activated sludge treatment is performed in the treatment tank, and the wastewater after the activated sludge treatment is separated into solid and liquid by the separation membrane installed in the treatment tank, and the treated water is taken out.
  • a tank is not required, and the apparatus configuration can be simplified.
  • a means for supplying a microbial activator for improving the clogging state of the separation membrane, a means for measuring the clogging state of the separation membrane, and a treatment based on the measured clogging state of the separation membrane is not required, and the apparatus configuration can be simplified.
  • the microorganisms that improve the clogging state of the separation membrane according to the clogging state of the separation membrane
  • the activator By supplying the activator, clogging of the separation membrane can be eliminated at a desired timing, and at least during the period other than the time when the activator of the microorganism is supplied, the inside of the treatment tank is made an environment suitable for activated sludge treatment. I can leave. Therefore, the life of the separation membrane can be extended with little influence on the original activated sludge treatment environment.
  • the microorganism that improves the clogged state of the separation membrane preferably includes a microorganism that secretes at least a proteolytic enzyme or a carbohydrate degrading enzyme outside the cell. According to this, even a deposit containing a glycoprotein that exhibits strong adhesion that cannot be peeled off even by bubbling or backwashing can be decomposed and purified to extend the life of the separation membrane. it can.
  • the microbial activator preferably contains at least an iron compound or a magnesium compound.
  • the iron compound or magnesium compound supplied as the activator increases the secretion of proteolytic enzymes and carbohydrate degrading enzymes that are secreted from the cells by the microorganisms.
  • the clogging can be eliminated, and at least during the period other than the time when the activating agent for the microorganism is supplied, the inside of the treatment tank can be kept in an environment suitable for the activated sludge treatment. Therefore, the life of the separation membrane can be extended with little influence on the original activated sludge treatment environment.
  • the microbial activator preferably contains at least a silicon compound. According to this, the growth of microorganisms is activated by the silicon compound supplied as the activator, and the proteolytic enzymes and carbohydrate degrading enzymes secreted by the microorganisms increase accordingly. Clogging can be eliminated.
  • the means for measuring the clogged state of the separation membrane includes a means for measuring the water pressure of the treated water solid-liquid separated by the separation membrane. According to this, the clogged state of the separation membrane can be easily monitored.
  • the life of the separation membrane can be extended with little influence on the original activated sludge treatment environment.
  • FIG. 1 It is a schematic block diagram which shows an example of the waste water treatment apparatus for enforcing the waste water treatment method by this invention. It is a schematic block diagram which shows the other example of the waste water treatment apparatus for enforcing the waste water treatment method by this invention. It is a control flowchart in the control apparatus of the waste water treatment apparatus shown in FIG. It is a control flowchart in the control apparatus of the waste water treatment apparatus shown in FIG. It is a graph which shows the result of having measured the proteolytic activity per cell density
  • FIG. It is a graph which shows the result of having measured the color of the iodine starch reaction about Bacillus strain A in Test Example 2 by the light absorbency of 550 nm.
  • FIG. It is a graph which shows the result of having measured the proteolytic activity per cell density
  • FIG. It is a graph which shows the result of having measured the color of the iodine starch reaction about Bacillus strain B in the test example 4 by the light absorbency of 550 nm.
  • FIG. 1 is a schematic configuration diagram showing an example of a waste water treatment apparatus for carrying out a waste water treatment method according to the present invention.
  • This waste water treatment apparatus includes a treatment tank 1 that treats waste water with activated sludge and a membrane module 2 installed in the treatment tank 1, and is a waste water treatment apparatus using a so-called membrane separation activated sludge method. Wastewater from which impurities have been removed in the pretreatment process is introduced into the treatment tank 1 through the flow rate adjustment tank, and activated sludge treatment is performed in the treatment tank 1 after staying for a predetermined time. The treated waste water is sucked by the suction pump 3 through a pipe communicating with the membrane module 2, and the liquid part separated by the separation membrane provided in the membrane module 2 is taken out as treated water. Excess sludge is discharged out of the system by the sludge extraction pump 4 as necessary.
  • the wastewater to be treated is not particularly limited as long as it contains nitrogen and organic matter.
  • household wastewater, cereal starch manufacturing industry, dairy manufacturing industry, meat center, sugar manufacturing industry, livestock food manufacturing industry examples include wastewater from livestock farming, meat product manufacturing, meat ham / sausage manufacturing, fish paste product manufacturing, fishery food manufacturing, organic chemical industry, and inorganic chemical industry.
  • any activated sludge containing microorganisms stays in or is put into the tank, and the activated sludge can be treated so that the contaminated components of the wastewater are decomposed and removed by the microorganisms in the activated sludge.
  • the activated sludge can be treated so that the contaminated components of the wastewater are decomposed and removed by the microorganisms in the activated sludge.
  • it may be an aeration tank using aerobic microorganisms such as ammonia oxidizing bacteria and nitrite oxidizing bacteria, and an intermittent aeration tank using aerobic microorganisms such as nitrite oxidizing bacteria and anaerobic microorganisms such as denitrifying bacteria. It may be.
  • any general filtration membrane can be used.
  • a reverse osmosis (RO) membrane for example, an ultrafiltration (UF) membrane, a microfiltration (MF) membrane, a hollow fiber (HF) membrane, etc.
  • the material for the filtration membrane include polyacrylonitrile, polyimide, polyethersulfone, polyphenylene sulfide sulfone, polytetrafluoroethylene, polyvinylidene fluoride, polypropylene, and polyethylene.
  • the form of the membrane module 2 is not particularly limited, and examples thereof include a hollow fiber membrane module, a flat membrane type module, a spiral type module, and a tubular module.
  • a diffuser plate 5 is provided at the bottom of the treatment tank 1 and below the membrane module 2, and the air from the blower 6 is supplied to the diffuser plate 5 to be processed in the treatment tank 1.
  • the waste water is aerated.
  • the purpose of this aeration treatment is to supply oxygen to the microorganisms in the activated sludge in the tank, but the bubbling action eliminates contaminants that are relatively weakly attached to the membrane module 2, or such contaminants are removed. It also plays a role of preventing the membrane module 2 from adhering.
  • an activator that improves the activity of microorganisms that improve the clogging state of the separation membrane which will be described later, is supplied from the activator supply tank 7 to the wastewater in the treatment tank 1 by an activator injection pump 8. It has become so.
  • a valve 9 is provided in the middle of the pipe, and the supply amount of the activator is adjusted by opening and closing the valve 9.
  • a pressure sensor 10 is provided in the middle of the pipe communicating with the membrane module 2 so that the water pressure of the treated water separated by the separation membrane is monitored.
  • the state of clogging of the separation membrane is improved in addition to or in place of such maintenance of the membrane module.
  • the microorganisms are dominant, and the microorganisms are activated according to the clogged state of the separation membrane.
  • the main cause of clogging of separation membranes in membrane modules is an activity that shows strong adhesion that cannot be removed by bubbling or backwashing from recent research. It has been clarified that it is a deposit containing glycoprotein produced by microorganisms in sludge (including sticky microorganisms and their debris). And glycoprotein is a strong causative agent. Therefore, by decomposing and removing this glycoprotein, it is possible to eliminate deposits firmly attached to the separation membrane of the membrane module and improve the clogging state of the separation membrane.
  • microorganisms capable of degrading and removing glycoproteins include microorganisms belonging to the genus Bacillus and microorganisms belonging to the genus Bifidos that secrete at least a proteolytic enzyme or a carbohydrate degrading enzyme outside the cell.
  • the microorganism that improves the clogging state of the separation membrane can be obtained by screening a microorganism that secretes at least a proteolytic enzyme or a carbohydrate degrading enzyme out of the bacterial body from among existing microorganism groups. For example, a microorganism having excellent protein degradability and carbohydrate degradability can be screened by the following simple enzyme activity test.
  • Degradability of protein A fungus is inoculated linearly on a plate of an agar culture medium containing casein at a concentration of 0.2 to 1.0 w / w%.
  • the agar culture medium containing casein is opaque to translucent. However, when a transparent band is formed around the colony of the fungus after the growth of the fungus, it indicates protein degradability (has protein degradability).
  • Bacillus bacterium Bacillus methylotrophicus CBMB205T (EU194897) strain, Bacillus subtilis subsp. Subtilis DSM 10T (AJ276351) strain, Bacillus subtilis subsp. SubtilisNBRC3009 strain, Bacillus subtilis subsp. Etc. subtilisATCC6051 strains can be used.
  • Bifidobacterium bifidum, Bifidobacterium breve, Bifidobacterium uminfantis etc. which are bifidobacteria can be used.
  • the microorganisms described above can be cultured, stored, and separated by methods commonly used for Bacillus or Bifidobacteria.
  • the medium such as Nutrient medium (0.3% meat extract, 0.5% peptone) or LB medium (0.5% yeast extract, 1% peptone, 1% sodium chloride) Culture can be performed.
  • microorganisms that improve the clogging state of the separation membrane are dominant. “Dominance” means that the number of the biota living in the treatment tank 1 is dominant. Whether it is dominant or not is determined by randomly identifying the biota living in the treatment tank 1 by determining the 16S rDNA sequence, etc. In addition, the percentage of microorganisms belonging to the genus species contained in the genus species is found by the simple enzyme activity test described above, etc. Can do. Specifically, about 1 ⁇ 10 7 to 1 ⁇ 10 10 microorganisms are present in 1 mL of activated sludge in the treatment tank 1 for improving the clogging state of the separation membrane.
  • the means for predominating the microorganism that improves the clogging state of the separation membrane in the treatment tank 1 is not particularly limited.
  • the Bacillus or Bifidobacterium exemplified above is used as an inoculum. As such, it is added to the seed sludge to be added, added to the waste water before flowing into the treatment tank 1, added to the waste water after flowing into the treatment tank 1, etc., and then the Bacillus bacteria and Bifidobacterium The method of maintaining the processing conditions in which the is maintained is mentioned.
  • the above microorganisms by adding the above microorganisms to the initial stage of the wastewater treatment operation, it is possible to ensure that the number is dominant in the biota living in the treatment tank 1, and then the treatment conditions of the conventional method If this is maintained, microorganisms that improve the clogging state of the separation membrane are dominant during the treatment period.
  • the surplus sludge obtained after dominating microorganisms that improve the clogging state of the separation membrane and performing wastewater treatment maintains the balance of the biota in which the microorganisms are dominated. Therefore, such excess sludge may be obtained from another wastewater treatment facility, and this may be added as seed sludge at the time of starting up the wastewater treatment facility to be newly treated.
  • seed bacteria and seed sludge may be added as needed.
  • the wastewater treatment conditions may be according to conventional methods.
  • the activated sludge concentration (MLSS) of the treated wastewater in the treatment tank 1 is controlled in the range of 2000 mg / L to 2500 mg / L.
  • the pH is preferably controlled in the vicinity of neutrality, that is, in the range of 6.5 to 7.
  • treatments that utilize the activity of microorganisms that tend to prefer anaerobic conditions denitrifying bacteria, dephosphorizing bacteria, denitrifying phosphorus-accumulating bacteria, etc.
  • microorganisms that prefer aerobic conditions nitrifying bacteria, yeast
  • the treatment for utilizing the activity of E. coli etc. may be carried out stepwise, continuously or intermittently in the treatment tank 1.
  • the redox potential under the anaerobic condition is in the range of ⁇ 150 mV to ⁇ 200 mV, and the dissolved oxygen amount under the aerobic condition is 2.0 mg / L— It is preferable to manage so that it may become the range of 3.5 mg / L.
  • the wastewater treatment apparatus shown in FIG. 1 can be performed by adjusting the supply of air from the diffuser plate 5.
  • the treatment is performed in an aerobic condition in which nitrifying bacteria act in the final process. It is preferable to finish the process.
  • the activation treatment of microorganisms for improving the clogging state of the separation membrane is performed according to the clogging state of the separation membrane.
  • the activation treatment can be performed, for example, by adding an iron compound such as an iron salt or a magnesium compound such as a magnesium salt to the wastewater treated with activated sludge in the treatment tank 1.
  • an iron compound such as an iron salt or a magnesium compound such as a magnesium salt
  • the microorganism activation process may be a process including both of them.
  • an activator containing at least an iron compound, a magnesium compound, and a silicon compound is stored in the activator supply tank 7, and the activator infusion pump 8 is used to store the activator in the treatment tank 1 when desired.
  • the content ratio between the total amount of the iron compound and magnesium compound contained in the activator and the silicon compound is preferably 0.5 to 5: 1 in terms of mass, and more preferably 2: 1.
  • the silicon compound is preferably added to the waste water in the treatment tank 1 so as to be present at a concentration of 0.1 to 2% by mass with respect to the BOD load of the treatment tank. More preferably, it is added so as to exist at a concentration of 0.2 to 1% by mass.
  • an iron compound or a magnesium compound it is added to the waste water in the treatment tank 1 so as to be present at a concentration of 0.1 to 2% by mass in terms of the total amount of both compounds with respect to the BOD load of the treatment tank. It is preferable to add such that it is present at a concentration of 0.4 to 2% by mass in terms of the total amount of both compounds with respect to the BOD load of the treatment tank.
  • the activator may contain other minerals in addition to the iron compound such as iron salt, magnesium compound such as magnesium salt, and silicon compound such as silicate.
  • examples include calcium compounds such as calcium salts, aluminum compounds such as aluminum salts, nickel compounds such as nickel salts, and titanium compounds such as titanium salts.
  • the state of clogging of the separation membrane can be grasped, for example, by measuring whether or not the water pressure of the treated water that has been solid-liquid separated by the separation membrane is below a predetermined value.
  • the separation membrane clogs with the progress of the wastewater treatment operation, and the membrane pressure rises, while the water pressure of the treated water solid-liquid separated by the separation membrane decreases, so that the water pressure is a predetermined threshold value. If it exceeds and falls below, it can be determined that it is time to eliminate clogging. In this case, it is preferable to perform measurement after applying a reverse water treatment from the treated water side opposite to that during steady operation to perform a backwash treatment of the separation membrane or a bubbling treatment of the separation membrane.
  • the state of the clogging of the separation membrane can be grasped more accurately.
  • the pressure of the treated water that has been solid-liquid separated by the separation membrane is monitored by a pressure sensor 10 provided in the middle of a pipe that communicates with the membrane module 2.
  • the water pressure from the treated water side can be applied by reversing the suction direction by the suction pump 3.
  • the treated water separated by solid-liquid separation by the separation membrane is used. This can be done by measuring whether or not the amount of water per unit time falls below a predetermined value determined arbitrarily. That is, the separation membrane clogs with the progress of the wastewater treatment operation, and the membrane pressure increases, while the amount of treated water solid-liquid separated by the separation membrane decreases per unit time. When the amount of water per hit exceeds a predetermined threshold and falls below, it can be determined that it is time to eliminate clogging.
  • FIG. 2 is a schematic configuration diagram showing another example of a wastewater treatment apparatus for carrying out the wastewater treatment method according to the present invention.
  • This waste water treatment apparatus differs from the waste water treatment apparatus shown in FIG. 1 in that it includes another activator supply tank 11 in addition to the activator supply tank 7. Similar to the activator supply tank 7, an activator that improves the activity against microorganisms that improve the clogging state of the separation membrane by the activator injection pump 12 from the activator supply tank 11 is a treatment tank. It is supplied to the waste water in 1.
  • a valve 13 is provided in the middle of the pipe, and the supply amount of the activator is adjusted by opening and closing the valve 13.
  • the activator can be added into the treatment tank 1 from two independent paths.
  • the iron compound and the magnesium compound can be introduced from the activator supply tank 11 while the silicon compound is introduced from the activator supply tank 7.
  • the silicon compound such as silicate has low solubility and must be supplied as a suspension, and the handling of the iron compound and magnesium is slightly complicated in order to adjust the addition concentration.
  • the compound can be supplied into the treatment tank 1 separately from the silicon compound such as silicate, without complicated handling.
  • the silicon compound that activates the growth of microorganisms regardless of the clogging state is continued. At the time of adding and eliminating clogging, the amount of silicon compound added may be increased, or only the iron compound and magnesium compound may be added, or both.
  • the waste water treatment apparatus of the present invention measures the clogging state of the separation membrane and means for supplying a microbial activator for improving the clogging state of the separation membrane in order to extend the life of the separation membrane of the membrane module. And a control means for controlling the supply amount of the activator into the wastewater treated with activated sludge in the treatment tank.
  • the activator supply tank 7 stores the activator
  • the activator injection pump 8 supplies the activator to the treatment tank 1.
  • a pressure sensor 10 is provided in the middle of the pipe communicating with the membrane module 2 to monitor the water pressure of the treated water that has been solid-liquid separated by the separation membrane. This constitutes the “means for measuring the clogging state of the separation membrane” of the present invention.
  • a control device 14 capable of receiving a signal corresponding to the water pressure value of the treated water in the pressure sensor 10 and transmitting a drive signal to the activator injection pump 8 or the valve 9 is provided. It constitutes “control means for controlling the amount of activator supplied into the wastewater treated with activated sludge in the treatment tank”.
  • the supply of the activator is continued until the water pressure value of the treated water in the pressure sensor 10 is compared with an arbitrarily determined predetermined value stored in the calculation unit 15 of the control device 14 and exceeds that value. Alternatively, it may be finished in a predetermined time.
  • this waste water treatment apparatus is provided with another activator supply tank 11 in addition to the activator supply tank 7, and the first from the activator supply tank 7. 1 is different from the waste water treatment apparatus shown in FIG. 1 in that the supply amount of the second active agent and the supply amount of the second active agent from the active agent supply tank 11 can be independently controlled by the control device 14.
  • the water pressure value of the treated water in the pressure sensor 10 is input to the first calculation unit 17 of the control device 14 and compared with an arbitrarily determined predetermined value stored in the calculation unit 17. If it is below the value, it is determined that it is time to eliminate clogging (FIG. 4).
  • a signal corresponding to the determination drives the activator infusion pump 8 or increases its driving amount through the first output unit 18 or opens the valve 9 or increases its opening amount.
  • a signal corresponding to the water pressure value of the treated water in the pressure sensor 10 is also input to the second calculation unit 19 of the control device 14 and is compared with an arbitrarily determined predetermined value stored in the calculation unit 19. If it is below that value, it is determined that it is time to eliminate clogging.
  • a signal corresponding to the determination drives the activator infusion pump 12 through the second output unit 20 or increases its driving amount, or opens the valve 13 or increases its opening amount. (Fig. 4).
  • the first activator from the activator supply tank 7 can be supplied into the processing tank 1 or the supply amount thereof can be increased, and independently of that.
  • the second activator from the activator supply tank 11 can be supplied into the processing tank 1 or its supply amount can be increased.
  • the supply of the first activator from the activator supply tank 7 is such that the water pressure value of the treated water in the pressure sensor 10 is an arbitrarily determined predetermined value stored in the first calculation unit 17 of the control device 14. The comparison may be continued until the value becomes equal to or greater than the value, or may be terminated in a predetermined time.
  • the second activator is supplied from the activator supply tank 11 in such a way that the water pressure value of the treated water in the pressure sensor 10 is an arbitrarily determined predetermined value stored in the second calculation unit 19 of the control device 14. The comparison may be continued until the value becomes equal to or greater than the value, or may be terminated in a predetermined time.
  • Bacillus methylotropicus (hereinafter referred to as “Bacillus strain A”), a bacterium belonging to the genus Bacillus, was inoculated into a Nutrient medium and cultured at 30 ° C. overnight.
  • an activator (a mineral containing silicate) that improves the activity of Bacillus bacteria, an iron salt added to the activator to increase the iron salt content by a factor of 2, and a magnesium salt as the activator
  • adding manganese salt to the active agent to increase the manganese salt content to a double amount adding calcium salt to the active agent
  • the calcium salt content increased by a factor of 2 was added to the culture medium at 2 mg / mL and cultured, and the proteolytic enzyme activities secreted into the culture were compared.
  • the measurement of proteolytic activity was performed by filtering the above culture solution through a filter having a pore size of 0.2 ⁇ m, and using the filtrate in a fluorescent proteolytic enzyme assay kit (Thermo Fisher Scientific).
  • a fluorescent proteolytic enzyme assay kit (Thermo Fisher Scientific).
  • the fluorescence intensity increased due to the presence of the proteolytic enzyme, and the measured fluorescence intensity was divided by the absorbance at 600 nm representing the cell concentration, and compared as the protease activity per unit cell concentration.
  • ⁇ Test Example 2 About Bacillus strain A, the amylolytic enzyme activity secreted in each culture solution cultured like Test Example 1 was investigated.
  • the above culture solution was filtered through a filter having a pore size of 0.2 ⁇ m, 3 mL of 0.5 w / w% water-soluble starch was added to 1 mL of the filtrate, and an iodine solution was added dropwise after 60 minutes. If starch remains, it exhibits a blue-violet color characteristic of iodine starch reaction, and if starch is decomposed, it does not change color. The color was measured by absorbance at 550 nm.
  • Bacillus sp Closely related to the Bacillus subtilis of the genus Bacillus. (Hereinafter referred to as “Bacillus strain B”) was tested in the same manner as in Test Example 1.
  • Test Example 4 For Bacillus strain B, the same test as in Test Example 2 was performed.
  • the active agent consisting of a mineral containing silicate that has been conventionally used as an activator for improving the activity of Bacillus bacteria, iron salt and magnesium salt in the mineral content It has been clarified that the effect of improving the enzymatic activity of Bacillus bacteria is particularly high by increasing the secretion of proteolytic enzymes and carbohydrate-degrading enzymes secreted by Bacillus bacteria outside the cells.
  • the manganese salt in the mineral content of the active agent has a particularly high effect of inhibiting the enzyme activity of Bacillus bacteria.
  • silicate among the mineral content of the active agent has an effect of assisting the growth of Bacillus bacteria. Therefore, it became clear that the activation process of Bacillus bacteria can be performed efficiently by individually optimizing the addition amount of these minerals added as the activator.
  • treatment tank 2 membrane module 3: suction pump 4: sludge extraction pump 5, diffuser plate 6: blower 7, 11: activator supply tank 8, 12: activator injection pump 9, 13: valve 10: pressure sensor 14: Control device 15: Calculation unit 16: Output unit 17: First calculation unit 18: First output unit 19: Second calculation unit 20: Second output unit

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

Abstract

L'objectif de l'invention est de fournir un procédé de traitement des eaux usées et un appareil de traitement des eaux usées avec lesquels la durée de vie d'une membrane de séparation peut être prolongée avec peu d'effet sur l'environnement de traitement à boues activées d'origine dans des procédés à boues activées à séparation par membrane. L'invention concerne un procédé de traitement des eaux usées destiné à introduire des eaux usées contenant des matières organiques dans un réservoir de traitement et effectuer un traitement à boues activées ainsi que séparer des solides de liquides dans les eaux usées après le traitement à boues activées grâce à une membrane de séparation installée dans le réservoir de traitement pour extraire l'eau traitée, où un microbe qui améliore le colmatage de l'élément de séparation est autorisé à dominer tandis que l'état de colmatage de la membrane de séparation est mesuré et l'activation du microbe est effectuée en fonction de l'état de colmatage de la membrane de separation mesuré. Le microbe qui améliore le colmatage de la membrane de séparation comprend de préférence un microbe qui sécrète de manière extracellulaire au moins une protéase ou une carbohydrase.
PCT/JP2016/059210 2016-03-23 2016-03-23 Procédé de traitement des eaux usées et appareil de traitement des eaux usées WO2017163340A1 (fr)

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CN201680078115.XA CN108602703A (zh) 2016-03-23 2016-03-23 排水处理方法以及排水处理装置
PCT/JP2016/059210 WO2017163340A1 (fr) 2016-03-23 2016-03-23 Procédé de traitement des eaux usées et appareil de traitement des eaux usées

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FR3096282B1 (fr) * 2019-05-22 2021-10-08 Institut National De Recherche En Sciences Et Tech Pour Lenvironnement Et Lagriculture Irstea Procede de traitement de dechets alimentaires et d’extraction de la chaleur associee a ce traitement

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JP2004298703A (ja) * 2003-03-31 2004-10-28 Kubota Corp 膜濾過装置の運転方法
JP2005295887A (ja) * 2004-04-12 2005-10-27 Chuo Bachiru World:Kk バチルス属細菌の高濃度増殖または高濃度胞子化促進培養資剤と、この培養資剤を用いた高濃度増殖または高濃度胞子化廃水処理法
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JP2021020138A (ja) * 2019-07-24 2021-02-18 水ｉｎｇ株式会社 生物処理槽内のバチルス属細菌によるデンプン分解を促進させるための排水の生物処理促進剤および排水処理方法
JP7219183B2 (ja) 2019-07-24 2023-02-07 水ｉｎｇ株式会社 生物処理槽内のバチルス属細菌によるデンプン分解を促進させるための排水の生物処理促進剤および排水処理方法

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