CN105384242A - Starting method of process for synchronously removing carbon, nitrogen and suspended matter in low carbon source wastewater through membrane bioreactor - Google Patents
Starting method of process for synchronously removing carbon, nitrogen and suspended matter in low carbon source wastewater through membrane bioreactor Download PDFInfo
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- CN105384242A CN105384242A CN201511002415.3A CN201511002415A CN105384242A CN 105384242 A CN105384242 A CN 105384242A CN 201511002415 A CN201511002415 A CN 201511002415A CN 105384242 A CN105384242 A CN 105384242A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- 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
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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- 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
Abstract
The invention discloses a starting method of the process for synchronously removing carbon, nitrogen and suspended matter in low carbon source wastewater through a membrane bioreactor, and relates to the processes of sewage autotrophic nitrogen removal, denitrification and membrane filtration. The technical problems that the removal rate of nitrogen in existing low carbon source sewage is low and various pollutants cannot be synchronously and efficiently removed easily are solved. The method includes the steps that returned sludge is transplanted in the membrane bioreactor, and suspended solids are removed first under the filtering action of a membrane assembly; then an anaerobic microenvironment is formed on the surface of a membrane wire by controlling the hydraulic retention time, the stirring speed and the backwashing period so that anaerobic ammonium oxidation bacteria can be enriched, meanwhile, oxygen is supplied into the reactor to enrich aerobic ammonia oxidation bacteria, and thus total nitrogen can be removed; at last, organic substances are added in incoming water to induce and enrich denitrifying bacteria, hence, the organic matter can be removed, and starting is completed. Successful starting can be achieved in 86 days under the indoor temperature condition through the municipal sewage factory returned sludge, and the carbon, the nitrogen and the suspended matter in the low carbon source wastewater can be removed synchronously and efficiently.
Description
Technical field
The invention belongs to sewage disposal and regeneration field, be specifically related to sewage autotrophic denitrification, denitrification and membrane filtration process.
Background technology
Along with the raising of industrial expansion and people's living standard, the quantity discharged of low-carbon-source waste water gets more and more.Low-carbon-source waste water is difficult to reach denitrification in traditional denitrification process and, to the demand of organic carbon source, causes nitric efficiency low.On the other hand, in the face of the problem such as energy dilemma, water scarcity, sewage recycling utilizes the trend having become social development.Therefore for the waste water containing higher organic carbon source, be more tending towards that organism is wherein converted into energy gases methane by anaerobically fermenting and utilize.Such processing mode can not remove nitrogen, and the water outlet therefore through anaerobic pretreatment becomes low ratio of carbon to ammonium (C/N ratio) waste water containing lower organism and higher nitrogen.To sum up, be no matter the objective shortage of organic carbon source in some waste water, or anaerobism production capacity is to the further consumption of organic carbon source, low-carbon-source will be all the predicament that faces of sewage water denitrification from now on.
Principal pollutant in low-carbon-source sewage are organism (representing with COD), ammonia nitrogen and suspended substance (representing with turbidity).Current study general thinks that being applicable to employing autotrophic denitrification technique processes, but this technique only can realize the nitrogen removal rate of maximum 89%, and synchronously can not remove COD, and common biological tank is also difficult to the removal realizing suspended substance simultaneously.
Summary of the invention
The present invention is the technical problem that clearance is low, multiple pollutant is difficult to synchronous high-efficiency removal that will solve nitrogen in existing low-carbon-source waste water, and provides a kind of starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water.
The starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water of the present invention, carries out according to the following steps:
One, membrane bioreactor water treatment system is set up, this system comprises into water peristaltic pump, membrane bioreactor, water outlet peristaltic pump and air pump, agitator, membrane module, distribution device, DO determinator, pH determinator and liquid level control gage are set in membrane bioreactor, water inlet peristaltic pump is connected with the water-in of membrane bioreactor, water outlet peristaltic pump is connected with the membrane module in membrane bioreactor, and air pump 3 is connected with the distribution device in membrane bioreactor;
Two, opening water inlet peristaltic pump passes in membrane bioreactor by artificial distribution, is then inoculated in membrane bioreactor by the returnedactivatedsludge taking from municipal wastewater treatment plant, and in inoculation post-reactor, activated sludge concentration is 3.8 ~ 4.3g/L; Wherein in artificial distribution, ammonia nitrogen concentration is 180 ~ 220mg/L, MgSO
4, KH
2pO
4and CaCl
2concentration be 50 ~ 100mg/L; The temperature of inside reactor is 23.5 ~ 27.5 DEG C, and pH is 7.5 ~ 8.0;
Three, turn on agitator, stirring velocity is 60 ~ 100r/min; Open water outlet peristaltic pump suction membrane module, remove suspended substance by membrane filtration effect; Adjusting water outlet peristaltic pump rotating speed controls water flow, makes hydraulic detention time remain on 5.0 ~ 7.5h; Open air pump, make membrane bioreactor at high-solubility oxygen DO
110 ~ 20 days are run, wherein DO under condition
1be 0.2 ~ 0.4mg/L, then back flushing; Dissolved oxygen concentration is made to be reduced to DO again
2run 10 ~ 20 days, wherein DO
2=(50% ~ 70%) DO
1, then back flushing; Repeat high-solubility oxygen DO again
1operation under condition, back flushing, low solution oxygen DO
2the operation of operation, back flushing under condition, detect nitrogen removal rate and the turbidity removal rate of membrane bioreactor simultaneously, reach more than 80% to nitrogen removal rate, and turbidity removal rate maintains more than 95% follow-up reforwarding row 15 days, completes the enrichment of aerobic ammonia-oxidizing bacteria and anaerobic ammonia oxidizing bacteria;
Four, in artificial distribution, add organism regulates influent COD to be 50 ~ 200mg/L, and dissolved oxygen concentration be 0.1 ~ 0.3mg/L, water flow is 0.20 ~ 0.35L/h, hydraulic detention time is 6.0 ~ 8.0h, temperature continues to run under being the condition of 23.5 ~ 27.5 DEG C, carries out back flushing when film water flow is less than 0.20L/h to membrane module; Continue after back flushing to run under these conditions, when film water flow is less than 0.20L/h, back flushing is carried out to membrane module; So repeatedly carry out, the simultaneously COD clearance of detection reaction device, nitrogen removal rate and turbidity removal rate, more than 85% is reached to COD clearance, and nitrogen removal rate maintains more than 90%, turbidity removal rate is more than 95%, namely complete the induction of denitrifying bacteria, the technique utilizing membrane bioreactor synchronously to remove carbon, nitrogen and suspended substance in low-carbon-source waste water starts successfully.
Utilize method of the present invention, with the returned sluge of municipal wastewater treatment plant for kind of a mud, returned sluge wide material sources, be easy to obtain, without the need to heating, at ambient temperature, utilize municipal wastewater treatment plant returned sluge successfully can start the synchronous technique removing carbon nitrogen and turbidity through 86 days, the fast and save energy of speed.Membrane bioreactor in the present invention, continuously pumping effect can make mud be attached to film silk surface and form microbial film, forms granule sludge, after back flushing rinse microbial film and granule sludge into inside reactor between film silk.Be active sludge in main body reactor, thus define the system that active sludge, granule sludge and microbial film three kinds of mud coexist mutually.And then be conducive to coexisting of the multiple-microorganisms such as aerobic ammonia-oxidizing bacteria, anaerobic ammonia oxidizing bacteria and denitrifying bacteria, synchronously can reduce COD and total nitrogen, realize the synchronous removal to multiple pollutant.In addition, the membrane filtration effect of membrane bioreactor can realize the efficient removal of suspended substance, solves three kinds of pollutents and is difficult to the synchronous difficult problem removed.Present method is at normal temperatures by controlling Inlet and outlet water flow, and stirring velocity, hydraulic detention time and backwashing period etc., realize the synchronous removal of multiple pollutant in low-carbon-source waste water at normal temperatures.Utilize the low-carbon-source waste water of present method process, its COD clearance reaches more than 85%, and nitrogen removal rate reaches more than 90% simultaneously, and turbidity removal rate reaches more than 95%, and this did not realize in other reactor kinds reported.In addition, the present invention achieves the synchronous removal of multiple pollutant in single reaction vessel, saves number of reactors, eliminates second pond, thus save floor space, has saved initial cost and operational and administrative expenses, is favourable to the energy-saving and cost-reducing of Sewage Plant.Membrane bioreactor structure is simple, facilitates the upgrading of existing Sewage Plant on basis, original aeration tank.The present invention is significant for the efficient low-consume process of low-carbon-source waste water.
Accompanying drawing explanation
Fig. 1 is membrane bioreactor water treatment system structural representation of the present invention; In figure, 1 is intake pump; 2 is membrane bioreactor; 2-1 is agitator; 2-2 is membrane module; 2-3 is distribution device; 2-4 is DO determinator; 2-5 is pH determinator, 2-6 is liquid level control gage; 3 for going out water pump; 4 is air pump;
Fig. 2 is nitrogen removal effect figure in membrane bioreactor start-up course in test 1, in figure, curve a is influent ammonia nitrogen variation relation curve in time, curve b is water outlet ammonia nitrogen variation relation curve in time, curve c is the sub-nitrogen of water outlet variation relation curve in time, curve d is water outlet nitre nitrogen variation relation curve in time, and curve e is nitrogen removal rate variation relation curve in time;
Fig. 3 is COD removal effect figure in membrane bioreactor start-up course in test 1, and in figure, curve a is influent COD variation relation curve in time, and curve b is water outlet COD variation relation curve in time, and curve c is COD clearance variation relation curve in time;
Fig. 4 is turbidity removal design sketch in membrane bioreactor start-up course in test 1, and in figure, curve a is influent turbidity variation relation curve in time, and curve b is delivery turbidity variation relation curve in time, and curve c is turbidity removal rate variation relation curve in time.
Embodiment
Embodiment one: the membrane bioreactor that utilizes of present embodiment synchronously removes the starting method of the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water, carries out according to the following steps:
One, membrane bioreactor water treatment system is set up, this system comprises into water peristaltic pump 1, membrane bioreactor 2, water outlet peristaltic pump 3 and air pump 4, arranges agitator 2-1, membrane module 2-2, distribution device 2-3, DO determinator 2-4, pH determinator 2-5 and liquid level control gage 2-6 in membrane bioreactor; Water inlet peristaltic pump 1 is connected with the water-in of membrane bioreactor 2, and water outlet peristaltic pump is connected with the membrane module 2-2 in membrane bioreactor, and air pump 3 is connected with the distribution device 2-3 in membrane bioreactor;
Two, opening water inlet peristaltic pump passes in membrane bioreactor by artificial distribution, is then inoculated in membrane bioreactor by the returnedactivatedsludge taking from municipal wastewater treatment plant, and in inoculation post-reactor, activated sludge concentration is 3.8 ~ 4.3g/L; Wherein in artificial distribution, ammonia nitrogen concentration is 180 ~ 220mg/L, MgSO
4, KH
2pO
4and CaCl
2concentration be 50 ~ 100mg/L; The temperature of inside reactor is 23.5 ~ 27.5 DEG C, and pH is 7.5 ~ 8.0;
Three, turn on agitator, stirring velocity is 60 ~ 100r/min; Open water outlet peristaltic pump suction membrane module, remove suspended substance by membrane filtration effect; Adjusting water outlet peristaltic pump rotating speed controls water flow, makes hydraulic detention time remain on 5.0 ~ 7.5h; Open air pump, make membrane bioreactor at high-solubility oxygen DO
110 ~ 20 days are run, wherein DO under condition
1be 0.2 ~ 0.4mg/L, then back flushing; Dissolved oxygen concentration is made to be reduced to DO again
2run 10 ~ 20 days, wherein DO
2=(50% ~ 70%) DO
1, then back flushing; Repeat high-solubility oxygen DO again
1operation under condition, back flushing, low solution oxygen DO
2the operation of operation, back flushing under condition, detect nitrogen removal rate and the turbidity removal rate of membrane bioreactor simultaneously, reach more than 80% to nitrogen removal rate, and turbidity removal rate maintains more than 95% follow-up reforwarding row 15 days, completes the enrichment of aerobic ammonia-oxidizing bacteria and anaerobic ammonia oxidizing bacteria;
Four, in artificial distribution, add organism regulates influent COD to be 50 ~ 200mg/L, and dissolved oxygen concentration be 0.1 ~ 0.3mg/L, water flow is 0.20 ~ 0.35L/h, hydraulic detention time is 6.0 ~ 8.0h, temperature continues to run under being the condition of 23.5 ~ 27.5 DEG C, carries out back flushing when film water flow is less than 0.20L/h to membrane module; Continue after back flushing to run under these conditions, when film water flow is less than 0.20L/h, back flushing is carried out to membrane module; So repeatedly carry out, the simultaneously COD clearance of detection reaction device, nitrogen removal rate and solid turbidity removal rate, more than 85% is reached to COD clearance, and nitrogen removal rate maintains more than 90%, turbidity removal rate is more than 95%, namely complete the induction of denitrifying bacteria, the technique utilizing membrane bioreactor synchronously to remove carbon, nitrogen and suspended substance in low-carbon-source waste water starts successfully.
Membrane bioreactor material described in step one is synthetic glass, built-in hollow fiber film assembly, and membrane pore size is 0.1um.Active sludge, microbial film and granule sludge three-phase microbial aggregate is there is in reactor;
Turbidity removal rate described in step 3 and four is defined as: turbidity removal rate (%)=(influent turbidity-delivery turbidity) × 100/ influent turbidity; Wherein the unit of influent turbidity is NTU; The unit of delivery turbidity is NTU;
Nitrogen removal rate described in step 3 and four is defined as: nitrogen removal rate (%)=(water inlet total nitrogen-water outlet total nitrogen) × 100/ water inlet total nitrogen; Wherein the intake unit of total nitrogen is mg/L; The unit of water outlet total nitrogen is mg/L;
COD clearance described in step 4 is defined as: COD clearance (%)=(influent COD-water outlet COD) × 100/ influent COD; Wherein the unit of influent COD is mg/L; The unit of water outlet COD is mg/L.
The present invention inoculates the returned sluge of municipal wastewater treatment plant in membrane bioreactor, is first realized the removal of suspended solid by the filteration of membrane module; Pass through afterwards to control hydraulic detention time, stirring velocity and backwashing period, form anaerobism microenvironment, enrichment anaerobic ammonia oxidizing bacteria on film silk surface, supply oxygen coalescence aerobic ammonia-oxidizing bacteria at inside reactor simultaneously, realize the removal of total nitrogen; Finally in water inlet, add a small amount of organic substance, induced concentration denitrifying bacteria, realize organic removal, complete startup.Utilize municipal wastewater treatment plant returned sluge can successfully start through 86 days at ambient temperature, the synchronous high-efficiency that can realize carbon, nitrogen and suspended substance in low-carbon-source waste water is removed.With municipal wastewater treatment plant returned sluge for kind of a mud, this sludge source is extensive, is easy to obtain, and without the need to heating, at ambient temperature, utilizes membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water capable of fast starting, and save energy.
Embodiment two: present embodiment and embodiment one are 215mg/L unlike the ammonia nitrogen concentration of the artificial distribution described in step 3.Other is identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two are 0.8:1 unlike carbon-nitrogen ratio of intaking in step 4.Other is identical with embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three are 1:1 unlike carbon-nitrogen ratio of intaking in step 4.Other is identical with one of embodiment one to three.
Embodiment five: present embodiment and one of embodiment one to four are that air water is in conjunction with back flushing unlike the back-flushing method described in step 3 and step 4, concrete operation step is: first close agitator 2-1, water inlet peristaltic pump 1, water outlet peristaltic pump 3 and air pump 4, leave standstill 1h; Afterwards water outlet peristaltic pump 3 is reversed, water outlet is imported the film silk inside recoil 5min of membrane module 2-2; Finally place in air by rising pipe, air is imported film silk inside recoil 5min, when film silk surface is no longer attached with mud, and after water flow reaches 0.20 ~ 0.35L/h, back flushing completes.Other is identical with one of embodiment one to four.
Embodiment six: one of present embodiment and embodiment one to five unlike: the rule that step 3 relaying reforwarding row is observed for 15 days is: at high-solubility oxygen DO
1operation under condition, back flushing, low solution oxygen DO
2operation, back flushing under condition.Other is identical with one of embodiment one to five.
With following verification experimental verification beneficial effect of the present invention:
Test 1, the starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water are carried out according to the following steps:
One, membrane bioreactor water treatment system is set up, this system is by peristaltic pump 1 of intaking, membrane bioreactor 2, water outlet peristaltic pump 3 and air pump 4, agitator 2-1, membrane module 2-2 are set in membrane bioreactor, distribution device 2-3, DO determinator 2-4, pH determinator 2-5 and distribution device liquid level control gage 2-6 forms, water inlet peristaltic pump 1 is connected with the water-in of membrane bioreactor 2, water outlet peristaltic pump is connected with the membrane module 2-2 in membrane bioreactor, and air pump 3 is connected with the distribution device in membrane bioreactor; Wherein membrane bioreactor is cylindrical reactor.Reactor material is synthetic glass, built-in hollow fiber film assembly, and film wire material is tubular fibre, and aperture is 0.1um.Built-in agitator keeps inside reactor to mix, and bottom controls dissolved oxygen, by the instruments such as online DO, pH real-time detection reaction device inner parameter by air pump and gas meter.The reactor effective volume of this test is 2L.
Two, opening water inlet peristaltic pump passes in membrane bioreactor by artificial distribution, is then inoculated in membrane bioreactor by the returned sluge taking from municipal wastewater treatment plant, and in inoculation post-reactor, activated sludge concentration is 3.9g/L; Wherein in artificial distribution, ammonia nitrogen concentration is 200 ~ 205mg/L, MgSO
4, KH
2pO
4and CaCl
2concentration be 50mg/L; The temperature of inside reactor is 24.5 ~ 25.5 DEG C, and pH is 7.5 ~ 8.0;
Three, turn on agitator, stirring velocity is 80r/min; Open water outlet peristaltic pump suction membrane module, remove suspended substance by membrane filtration effect; Regulating peristaltic pump rotating speed to control water flow is 0.25L/h, and hydraulic detention time is 5.0h; Open air pump, in membrane bioreactor, dissolved oxygen concentration is run 15 days under the condition of 0.3mg/L, carries out back flushing to membrane module, continuing afterwards to maintain water flow is 0.25L/h, reducing DO is that 0.2mg/L reruns 15 days, continues back flushing afterwards, completes first cycle for the treatment of; Be run 15 days under the condition of 0.3mg/L again at dissolved oxygen concentration, back flushing is carried out to membrane module, continuing afterwards to maintain water flow is 0.25L/h, reducing DO is that 0.2mg/L reruns 15 days, continue back flushing afterwards, complete second cycle for the treatment of, by that analogy, in process of the test, carry out back flushing the 15th day, 30 days, 45 days and 60 days respectively.The nitrogen removal rate of detection reaction device, the 48th day time, nitrogen removal rate reaches more than 80%, turbidity removal rate maintains more than 95% simultaneously, operation 15 days to the 64th day is continued again afterwards by above circulation, complete the enrichment of aerobic ammonia-oxidizing bacteria and anaerobic ammonia oxidizing bacteria, this stage nitrogen removal rate in time variation relation as shown in Fig. 2 curve e;
Four, from the 65th day, add glucose and make influent COD be 100mg/L in artificial distribution, increasing aeration control dissolved oxygen concentration is still 0.2mg/L; Regulating peristaltic pump rotating speed to control water flow is 0.33L/h, and be 6.0h at hydraulic detention time, temperature is continue operation 10 days under the condition of 24.5 ~ 25.5 DEG C, and now film water flow is less than 0.20L/h, carries out back flushing to membrane module.Continue after back flushing to run according to above-mentioned condition, carry out back flushing when film water flow is less than 0.20L/h to membrane module, in the process of repeatedly carrying out, this test has carried out back flushing at the 75th day, 85 days respectively.The nitrogen removal rate of detection reaction device, COD clearance and turbidity removal rate in process of the test, the 86th day time, COD clearance reaches more than 85%, nitrogen removal rate is more than 90% simultaneously, turbidity removal rate is more than 95%, complete the induction of denitrifying bacteria, the technique utilizing membrane bioreactor synchronously to remove carbon, nitrogen and suspended substance in low-carbon-source waste water starts successfully.
In this test step 3 and the back-flushing method described in step 4 be air water in conjunction with back flushing, concrete operation step is:
First close agitator 2-1, water inlet peristaltic pump 1, water outlet peristaltic pump 3 and air pump 4, leave standstill 1h; Afterwards water outlet peristaltic pump 3 is reversed, water outlet is imported the film silk inside recoil 5min of membrane module 2-2; Finally place in air by rising pipe, air is imported film silk inside recoil 5min, when film silk surface is no longer attached with mud, and after water flow reaches 0.20 ~ 0.35L/h, back flushing completes.
Detect water turbidity in whole process of the test, turbidity removal rate is greater than 95% always, achieves the synchronous removal of COD, total nitrogen and suspended substance.This stage COD clearance in time variation relation as shown in Fig. 3 curve c, in process of the test turbidity removal rate in time variation relation as shown in Fig. 4 curve c.
In this test, after 86th day, nitrogen removal rate, COD clearance, turbidity removal rate all grow steadily, maintain 90%, 85%, more than 95% respectively, reactor keeps steady running, in visible reactor, active sludge changes redness into by brownish black gradually via yellow simultaneously, then becomes red-brown.
Through the start-up course of 86 days, membrane bioreactor water treatment system reaches a kind of stable state, utilize the microbiological condition formed in start-up course, in conjunction with other hydraulics, this membrane bioreactor water treatment system can by the synchronous removal of the carbon in low-carbon-source waste water, nitrogen and suspended substance.After having started after 86 days, just directly can input the low-carbon-source waste water that carbon-nitrogen ratio is less than 3 and carry out operating of water treatment.
Claims (5)
1. utilize membrane bioreactor synchronously to remove a starting method for the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water, it is characterized in that the method is carried out according to the following steps:
One, membrane bioreactor water treatment system is set up, this system comprises into water peristaltic pump (1), membrane bioreactor (2), water outlet peristaltic pump (3) and air pump (4), arranges agitator (2-1), membrane module (2-2), distribution device (2-3), DO determinator (2-4), pH determinator (2-5) and liquid level control gage (2-6) in membrane bioreactor; Water inlet peristaltic pump (1) is connected with the water-in of membrane bioreactor (2), water outlet peristaltic pump is connected with the membrane module (2-2) in membrane bioreactor, and air pump (3) is connected with the distribution device (2-3) in membrane bioreactor;
Two, opening water inlet peristaltic pump passes in membrane bioreactor by artificial distribution, is then inoculated in membrane bioreactor by the returnedactivatedsludge taking from municipal wastewater treatment plant, and in inoculation post-reactor, activated sludge concentration is 3.8 ~ 4.3g/L; Wherein in artificial distribution, ammonia nitrogen concentration is 180 ~ 220mg/L, MgSO
4, KH
2pO
4and CaCl
2concentration be 50 ~ 100mg/L; The temperature of inside reactor is 23.5 ~ 27.5 DEG C, and pH is 7.5 ~ 8.0;
Three, turn on agitator, stirring velocity is 60 ~ 100r/min; Open water outlet peristaltic pump suction membrane module, remove suspended substance by membrane filtration effect; Adjusting water outlet peristaltic pump rotating speed controls water flow, makes hydraulic detention time remain on 5.0 ~ 7.5h; Open air pump, make membrane bioreactor at high-solubility oxygen DO
110 ~ 20 days are run, wherein DO under condition
1be 0.2 ~ 0.4mg/L, then back flushing; Dissolved oxygen concentration is made to be reduced to DO again
2run 10 ~ 20 days, wherein DO
2=(50% ~ 70%) DO
1, then back flushing; Repeat high-solubility oxygen DO again
1operation under condition, back flushing, low solution oxygen DO
2the operation of operation, back flushing under condition, detect nitrogen removal rate and the turbidity removal rate of membrane bioreactor simultaneously, reach more than 80% to nitrogen removal rate, and turbidity removal rate maintains more than 95% follow-up reforwarding row 15 days, completes the enrichment of aerobic ammonia-oxidizing bacteria and anaerobic ammonia oxidizing bacteria;
Four, in artificial distribution, add organism regulates influent COD to be 50 ~ 200mg/L, and dissolved oxygen concentration be 0.1 ~ 0.3mg/L, water flow is 0.20 ~ 0.35L/h, hydraulic detention time is 6.0 ~ 8.0h, temperature continues to run under being the condition of 23.5 ~ 27.5 DEG C, carries out back flushing when film water flow is less than 0.20L/h to membrane module; Continue after back flushing to run under these conditions, when film water flow is less than 0.20L/h, back flushing is carried out to membrane module; So repeatedly carry out, the simultaneously COD clearance of detection reaction device, nitrogen removal rate and turbidity removal rate, more than 85% is reached to COD clearance, and nitrogen removal rate maintains more than 90%, turbidity removal rate is more than 95%, namely complete the induction of denitrifying bacteria, the technique utilizing membrane bioreactor synchronously to remove carbon, nitrogen and suspended substance in low-carbon-source waste water starts successfully.
2. a kind of starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water according to claim 1, is characterized in that the ammonia nitrogen concentration of the artificial distribution described in step 3 is 215mg/L.
3. a kind of starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water according to claim 1 and 2, the carbon-nitrogen ratio that it is characterized in that intaking in step 4 is 0.8:1.
4. a kind of starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water according to claim 1 and 2, the carbon-nitrogen ratio that it is characterized in that intaking in step 4 is 1:1.
5. a kind of starting method utilizing membrane bioreactor synchronously to remove the technique of carbon, nitrogen and suspended substance in low-carbon-source waste water according to claim 1 and 2, it is characterized in that the back-flushing method described in step 3 and step 4 is that air water is in conjunction with back flushing, concrete operation step is: first close agitator (2-1), water inlet peristaltic pump (1), water outlet peristaltic pump (3) and air pump (4), leave standstill 1h; Afterwards water outlet peristaltic pump (3) is reversed, water outlet is imported the film silk inside recoil 5min of membrane module (2-2); Finally place in air by rising pipe, air is imported film silk inside recoil 5min, when film silk surface is no longer attached with mud, and after water flow reaches 0.20 ~ 0.35L/h, back flushing completes.
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