CN1807276A - Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor - Google Patents
Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor Download PDFInfo
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- CN1807276A CN1807276A CNA2006100096936A CN200610009693A CN1807276A CN 1807276 A CN1807276 A CN 1807276A CN A2006100096936 A CNA2006100096936 A CN A2006100096936A CN 200610009693 A CN200610009693 A CN 200610009693A CN 1807276 A CN1807276 A CN 1807276A
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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 disclosed sewage treatment method to denitrify and recover phosphorus by a sludge external circulating composite membrane bioreactor comprises: attaching the bilmembrane on the filling; keeping the sewage in biormembrane zone for 3~5h; adjusting the micropore aerator to control the COD in biormembrane zone within 0. 5-1. 5mg/L for synchronous nitration and denitrification; letting the output water into the deposition zone with surface load as 1. 0m3/m2. h through the rectification baffle on bottom; finally, guiding 35~45% deposited sludge in bioreactor into the dephosphorization pond. Compared with prior art, this invention saves 40~60% land, has low residual sludge, reduces cost about 20%, and outputs super water for direct usage.
Description
Technical field
The present invention relates to a kind of municipal sewage treatment and resource recycling method.
Background technology
In recent years, China's water body nitrogen and phosphorus pollution is serious.Nitrogen and phosphorus pollution has caused the loss of body eutrophication and this Nonrenewable resources of phosphorus, has caused " phosphorus crisis ".The effective way that addresses these problems is that the nitrogen in the sewage is removed with the form of nitrogen, and phosphorus is then reclaimed.Existing process for removing nitrogen and phosphor from sewage (referring to Fig. 1) exists the problem of the following aspects: (1) technology is moved according to suspension type active sludge mode, exist the mud competition in age between polyP bacteria and the nitrifier, for guaranteeing the sedimentation effect of wastewater treatment efficiency and second pond, biomass must be controlled within the 4000mg/L in the aeration tank, and this makes that the sewage treatment facility floor space is bigger; (2) in order to guarantee good denitrogenation dephosphorizing effect, have the return sludge ratio and the nitrification liquid internal reflux measure that is not less than 200% of arts demand 50%～100% now, this makes the sewage disposal power consumption increase; (3) phosphorus can not be recycled with excess sludge discharge; (4) the residual active sludge difficult treatment that produces of sewage disposal, sludge disposal expense height, and the secondary that tends to occur phosphorus in the sludge handling process discharges, and deals with improperly and can cause secondary pollution to environment.Membrane technology is a new technology of introducing water treatment field in recent years, and it is also having more application aspect the processing of advanced treatment of wastewater, organic wastewater with difficult degradation thereby.Membrane bioreactor (MBR) utilizes microorganism in the reactor that the crown_interception of the absorption degradation effect of pollutent and film is realized purification to sanitary sewage.The crown_interception of film makes does not need secondary sedimentation basins in the sewage treatment process, make the interior sludge concentration of reactor increase greatly simultaneously, the increase of sludge concentration makes under the condition that the sewage disposal load remains unchanged, the aeration tank volume will dwindle greatly, and these can dwindle the floor space of sewage treatment facility greatly; High sludge concentration in the membrane bioreactor can create partial anaerobic-aerobic coexisted environment, and this makes it have certain nitric efficiency.But domestic and international at present in the process of using membrane bioreactor, membrane bioreactor does not have obvious removal effect because sludge yield is low, sludge volume is few to phosphorus.(background technology reference: 1. Harbin Institute of Technology's journal, the 35th the 2nd phase of volume of February in 2003.2. " bio-contact oxidation membrane bioreactor ", publication number CN1611453A, open day on May 4th, 2005.3. " chemically reinforced biological phosphate-eliminating process ", publication number CN1417142A, open day on May 14th, 2003.4. " integral type film biological reactor ", publication number CN1358674A, open day on July 17th, 2002.5. " integral type film biological reactor ", Granted publication CN2526315Y, December 18 2002 Granted publication day.)
Summary of the invention
The objective of the invention is that the floor space that prior art exists is big, excess sludge production is high in order to solve, sewage disposal expense height, can not reclaim the problem of phosphorus, a kind of mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor is provided.The characteristics that the present invention has that floor space is little, excess sludge production is few, sewage treating efficiency is high, can reclaim phosphorus.Technical scheme of the present invention is achieved in that in the microbial film district of combined film bioreactor leading portion suspension type or floating filler is set, with microbial film attached to above the filler, sewage is 3～5 hours in the residence time in microbial film district, the dissolved oxygen concentration of adjusting micro-hole aerator control microbial film district carries out synchronous nitration denitrification denitrogenation between 0.5-1.5mg/L; Allow the water outlet in microbial film district enter the settling region from the bottom rectifying baffle plate, the settling region surface load is 1.0m3/m2.h, finish mud-water separation in the settling region, the heavy mud part in bottom, settling region is participated in the release and the recovery of mud outer circulation carrying out phosphorus, another part precipitating sludge refluxes to stitch by bottom mud and enters into the microbial film district, the top of settling region is membrane separation zone, crown_interception by membrane module, obtain water outlet up to standard, its aeration intensity of boring aeration device under the membrane module is realized by dissolved oxygen concentration in the assaying reaction device, the control dissolved oxygen concentration is 4-6mg/L, prevent that film from polluting and the nitrification in enhanced biological film district, the dephosphorization pond is set behind combined film bioreactor, 35～45% of settling region precipitating sludge in the combined film bioreactor is introduced the dephosphorization pond, introduce simultaneously and contain easy degraded organic carbon sewage, the volume ratio of returned sluge and sewage is by the amount decision of contained easy degraded organic carbon in the sewage, the volume ratio of returned sluge and sanitary sewage is 1: 1～2, make polyP bacteria store competent PHB here and finish effective release of phosphorus, realize mud-water separation simultaneously, the hydraulic detention time of mud mixed liquid in the dephosphorization pond is 2.5～3.5 hours, be back to the removal of proceeding nitrogen in the combined film bioreactor and the absorption of phosphorus through releasing mud behind the phosphorus, rich phosphorus sewage then enters the phosphorus pond for recovering and reclaims by adding chemical agent.The invention solves the low problem of membrane bioreactor dephosphorization efficiency by using, simultaneously this Nonrenewable resources of phosphorus are reclaimed, and on the basis that does not increase power consumption, improved the nitric efficiency of membrane bioreactor.Compare with existing process for removing nitrogen and phosphor from sewage, it can save 40%～60% occupation of land, and excess sludge production is extremely low, and phosphor resource reclaimed do not exist secondary to discharge problem, make sewage ton cost of water treatment reduce about 20%, and effluent quality is good, can direct reuse.
Description of drawings
Fig. 1 is the denitrification dephosphorization technique schema of prior art, and Fig. 2 is a process flow sheet of the present invention, and Fig. 3 is the structural representation of the combined film bioreactor that uses of the present invention, Reference numeral 1-microbial film district among Fig. 3,2-membrane separation zone, 3-settling region, the 4-filler, 5-micro-hole aerator, 6-boring aeration device, 7-rectification baffle plate, 8-mud refluxes and stitches 9-membrane module, 10-water entry, the 11-water exit, 12-mud outer circulation passage.
Embodiment
Embodiment one: the technical scheme of (referring to Fig. 2, Fig. 3) present embodiment is achieved in that in the microbial film district 1 of combined film bioreactor leading portion suspension type or floating filler is set, with microbial film attached to above the filler 4, sewage is 3～5 hours in the residence time in microbial film district 1, the dissolved oxygen concentration of adjusting micro-hole aerator 5 control microbial film districts 1 carries out synchronous nitration denitrification denitrogenation between 0.5-1.5mg/L; Allow the water outlet in microbial film district 1 enter settling region 3 from bottom rectifying baffle plate 7, settling region 3 surface loads are 1.0m3/m2.h, 3 finish mud-water separation in the settling region, the heavy mud part in 3 bottoms, settling region is participated in the release and the recovery of mud outer circulation carrying out phosphorus, another part precipitating sludge enters into microbial film district 1 by bottom mud backflow seam 8, the top of settling region 3 is membrane separation zone 2, crown_interception by membrane module 9, obtain water outlet up to standard, boring aeration device 6 its aeration intensities under the membrane module 9 are realized by dissolved oxygen concentration in the assaying reaction device, the control dissolved oxygen concentration is 4-6mg/L, prevent that film from polluting and the nitrification in enhanced biological film district 1, the dephosphorization pond is set behind combined film bioreactor, 35～45% of 3 precipitating sludges of settling region in the combined film bioreactor are introduced the dephosphorization pond, introduce simultaneously and contain easy degraded organic carbon sewage, the volume ratio of returned sluge and sewage is by the amount decision of contained easy degraded organic carbon in the sewage, the volume ratio of returned sluge and sanitary sewage is 1: 1～2, make polyP bacteria store competent PHB here and finish effective release of phosphorus, realize mud-water separation simultaneously, the hydraulic detention time of mud mixed liquid in the dephosphorization pond is 2.5～3.5 hours, be back to the removal of proceeding nitrogen in the combined film bioreactor and the absorption of phosphorus through releasing mud behind the phosphorus, rich phosphorus sewage then enters the phosphorus pond for recovering and reclaims by adding chemical agent.
Embodiment two: it is aluminium salt, molysite, magnesium salts or lime in the chemical precipitation agent and they compound by arbitrary proportion that present embodiment reclaims chemical agent that phosphorus adds.Other method is with concrete
Embodiment one is identical.
Embodiment three: present embodiment adopts lime as chemical precipitation agent, and the throwing amount of lime makes the pH value of sewage reach 10.1～10.6 and gets final product.Other method is identical with embodiment one.Experimental result shows: when adopting lime as chemical precipitation agent, the throwing amount of lime concentration relevant with the basicity in the sewage and phosphor in sewage is irrelevant, adds lime when sewage pH value reaches 10.4 left and right sides, and the recovering effect of phosphorus is best.
Embodiment four: the intermediate processing that present embodiment adopts magnesium chloride to add alkali formation magnesium ammonium phosphate simultaneously ammonia nitrogen and phosphorus reclaims Mg
2+: NH
4 +: PO4
3-Molar ratio be 1.2: 1.2: 1.Other method is identical with embodiment one.Experimental result shows: when ammonia nitrogen in the sewage and phosphorus content all than higher the time, preferentially adopting magnesium chloride to add coprecipitation mode that alkali forms magnesium ammonium phosphate, to come that simultaneously ammonia nitrogen and phosphorus are carried out recovering effect best.
Embodiment five: the difference of present embodiment and embodiment one is that the source of the gas of aeration is a purity oxygen.Adopt pure oxygen aeration can improve oxidation effect greatly and to the removal efficient of pollutent.Other method is identical with embodiment one.
Embodiment six: the difference of present embodiment and embodiment one is that the mounting means of filling carrier is that horizontal floated is installed.Filler can fluctuate with liquid level change in the processing system, establishes stationary installation on reactor top, fixes the level attitude of filler.Other method is identical with embodiment one.
Embodiment seven: the difference of present embodiment and embodiment one is, membrane module is placed the middle and upper part of reactor, below membrane module, establish buffer layer and do not establish the settling region, make mud form in buffer layer that top is aerobic, the bottom anoxic environment, denitrification functions that like this can consolidation system makes that simultaneously the nitrate content in the anaerobism outer circulation mud keeps lower level.Other method is identical with embodiment one.
Embodiment eight: the difference of present embodiment and embodiment one is, leading portion in combined film bioreactor is provided with the multistage packing area, make Installed System Memory in the anaerobic-anoxic district, multiple microorganism growth environment such as anaerobic-aerobic zone of transition, aerobic zone.Can guarantee that like this internal system forms anoxic-aerobic coexistence system, realizes synchronous nitration denitrification denitrogenation; Simultaneously can also realize the anoxic denitrification dephosphorization.In addition, the anaerobion that adheres on the filling carrier in anaerobism-oxygen-starved area can be improved the biodegradability of sewage, the pollution that slows down membrane module to the sewage acidifying that is hydrolyzed.Other method is identical with embodiment one.
Embodiment nine: the difference of present embodiment and embodiment one is that the sludge anaerobic outer circulation is an intermittent cycle.Can prevent that like this locking system may the system that make can't normally move owing to the outer circulation sludge quantity is too little.Other method is identical with embodiment one.
Embodiment ten: the difference of present embodiment and embodiment one is that the carbon source that adds during anaerobic phosphorus release is beer waste water (liquid) or other easy degradation of organic waste water.The carbon source that adds during anaerobic phosphorus release is that beer waste water or other contain high density easily the degrade organic waste water rather than the sanitary sewage of low-molecular-weight organic matter.So both the pollutent resource can be made full use of, the unit cost of part enterprise can be reduced again.According to the prerequisite of this operation scheme operation is to have the competent high density of being convenient to utilize to hang down carbon source sewage near the Sewage Plant.Other method is identical with embodiment one.
Claims (7)
1, a kind of mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor, it is characterized in that this technical scheme is achieved in that in the microbial film district of combined film bioreactor leading portion is provided with suspension type or floating filler, with microbial film attached to above the filler, sewage is 3～5 hours in the residence time in microbial film district, the dissolved oxygen concentration of adjusting micro-hole aerator control microbial film district carries out synchronous nitration denitrification denitrogenation between 0.5-1.5mg/L; Allow the water outlet in microbial film district enter the settling region from the bottom rectifying baffle plate, the settling region surface load is 1.0m
3/ m
2.h, finish mud-water separation in the settling region, the heavy mud part in bottom, settling region is participated in the release and the recovery of mud outer circulation carrying out phosphorus, another part precipitating sludge refluxes to stitch by bottom mud and enters into the microbial film district, the top of settling region is membrane separation zone, crown_interception by membrane module, obtain water outlet up to standard, its aeration intensity of boring aeration device under the membrane module is realized by dissolved oxygen concentration in the assaying reaction device, the control dissolved oxygen concentration is 4-6mg/L, prevent that film from polluting and the nitrification in enhanced biological film district, the dephosphorization pond is set behind combined film bioreactor, 35～45% of settling region precipitating sludge in the combined film bioreactor is introduced the dephosphorization pond, introduce simultaneously and contain easy degraded organic carbon sewage, the volume ratio of returned sluge and sewage is by the amount decision of contained easy degraded organic carbon in the sewage, the volume ratio of returned sluge and sanitary sewage is 1: 1～2, make polyP bacteria store competent PHB here and finish effective release of phosphorus, realize mud-water separation simultaneously, the hydraulic detention time of mud mixed liquid in the dephosphorization pond is 2.5～3.5 hours, be back to the removal of proceeding nitrogen in the combined film bioreactor and the absorption of phosphorus through releasing mud behind the phosphorus, rich phosphorus sewage then enters the phosphorus pond for recovering and reclaims by adding chemical agent.
2, mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor according to claim 1 is characterized in that reclaiming chemical agent that phosphorus adds and is aluminium salt, molysite, magnesium salts or lime in the chemical precipitation agent and they compound by arbitrary proportion.
3, mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor according to claim 2 is characterized in that adopting lime as chemical precipitation agent, and the throwing amount of lime makes the pH value of sewage reach 10.1～10.6.
4, mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor according to claim 2 is characterized in that the intermediate processing that adopts magnesium chloride to add alkali formation magnesium ammonium phosphate simultaneously ammonia nitrogen and phosphorus reclaims Mg
2+: NH
4 +: PO4
3-Molar ratio be 1.2: 1.2: 1.
5, mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor according to claim 1, the source of the gas that it is characterized in that aeration is a purity oxygen.
6, mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor according to claim 1 is characterized in that the sludge anaerobic outer circulation is an intermittent cycle.
7, mud outer circulation combined film bioreactor sewage treatment method of denitrifying and recovering phosphor according to claim 1 is characterized in that the carbon source that anaerobic phosphorus release adds is a beer waste water.
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| CNB2006100096936A CN100372784C (en) | 2006-02-08 | 2006-02-08 | Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor |
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| CNB2006100096936A CN100372784C (en) | 2006-02-08 | 2006-02-08 | Sludge outer circulation type sewage treatment method of denitrifying and recovering phosphor using composite membrane bioreactor |
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| WO2010115319A1 (en) * | 2009-04-09 | 2010-10-14 | 北京汉青天朗水处理科技有限公司 | Sewage treatment process and system |
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