CN106565017A - Bicirculating nitrogen and phosphorus removal wastewater treatment system and method - Google Patents

Bicirculating nitrogen and phosphorus removal wastewater treatment system and method Download PDF

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Publication number
CN106565017A
CN106565017A CN201610925255.8A CN201610925255A CN106565017A CN 106565017 A CN106565017 A CN 106565017A CN 201610925255 A CN201610925255 A CN 201610925255A CN 106565017 A CN106565017 A CN 106565017A
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pond
sludge
mud
coupling
nitrification
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CN106565017B (en
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郑俊
张德伟
郑杰
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HUAQI ENVIRONMENT PROTECTION SCIENCE AND TECHNOLOGY Co Ltd
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HUAQI ENVIRONMENT PROTECTION SCIENCE AND TECHNOLOGY Co Ltd
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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
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements

Abstract

The invention discloses a bicirculating nitrogen and phosphorus removal wastewater treatment system and method. The system is formed by serially connecting a membrane-sludge coupling pool, a settling pool, an aerobiotic nitration biofilter pool and a chemical phosphorus removal pool in sequence; a sludge return apparatus is arranged between the settling pool and the membrane-sludge coupling pool; and a nitration solution return apparatus is arranged between the aerobiotic nitration biofilter pool and the membrane-sludge coupling pool. According to the system, wastewater treatment is realized through a nitrogen and carbon removal hydrolysis reaction, a sludge-water separation reaction and a carbon removal nitration reaction; the problems of insufficient utilization of raw water carbon sources, complex pretreatment and frequent back-flushing of a conventional biological aerated filter pool, and the like can be effectively solved; the nitrogen and phosphorus removal effect is improved; and the system and the method have the characteristics of low cost, biological multiplication and the like.

Description

A kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment and its method
Technical field
The invention belongs to water-treatment technology field, and in particular to a kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment and its Process.
Background technology
BAF（BAF）It is New biological membrane method sewage treatment process that developed recently gets up, with efficient Removal of carbon and nitrogen efficiency, floor space are little, operating cost is low, without second pond the features such as.But, biological aerated filter process is to water inlet Concentration of suspension require higher, needs carry out the pretreatment of complexity, such as conventional coagulating sedimentation, membrane filtration or other combinations Technique, this will undoubtedly increase technological process and the operational management difficulty of BAF, while can go in preprocessing process Except substantial amounts of Organic substance（General COD clearances are 40% ~ 70%）, this newest country's discharge mark for control water outlet total nitrogen will reach For accurate biological aerated filter process, the removal of excessive Organic substance will cause the carbon source during denitrification denitrogenation not enough. Southern area problem is particularly acute, and southern raw water COD/TN is generally low, if eliminating in preprocessing process substantial amounts of organic Thing, generally needs to add Organic substance carbon source during follow-up denitrification denitrogenation（Glucose, methanol, sodium acetate etc.）To supplement Organic substance, the Organic substance carbon source in raw water can not be fully utilized and traditional pretreatment caused by problem, not only increase Operating cost is added, while also result in CO2 emissions greatly increasing.Additionally, in denitrification and denitrogenation biological filter-good In oxygen nitrification biofilter group technology, although pretreatment can reduce denitrification and denitrogenation biological filter to enter aqueous suspension dense Degree, but the float in pretreatment water outlet is still higher, causes denitrification denitrogenation pond resistance in running constantly to rise, and needs Continually carry out backwash to keep the stable operation of denitrification and denitrogenation biological filter.Additionally, follow-up aerobic biofilter enters Organic concentration in water can cause the amount reproduction of heterotrophic bacteria, it is suppressed that Nitrification of the nitrobacteria to ammonia nitrogen, while increasing Backwash frequency is added, frequently backwash is more easily caused the recovery cycle mistake of Biomass and biological activity in aerobic biofilter Long, this undoubtedly reduces the treatment efficiency of structures and increased management difficulty and operating cost.
In traditional biological aerated filter process, the removal effect of phosphorus is typically poor, needs to coordinate using preposition or rearmounted Chemical dephosphorization measure, in the engineering of preposition biological phosphate-eliminating, not only orthophosphate can consume substantial amounts of Dephosphorization reagent, big in sewage The total phosphorus of amount is removed, and the content of low concentration phosphorus is highly detrimental to the growth of microorganism in waste water, has had a strong impact on follow-up The efficiency of biological treatment, at the same in the engineering of preposition biological phosphate-eliminating a large amount of fine particle, colloid or Organic substances etc. presence Substantial amounts of Dephosphorization reagent can be consumed, this undoubtedly increased the operating cost of sewage disposal.Therefore, according to denitrogenation dephosphorizing principle, carry High volumetric loading, the dosage for rationally utilizing sewage carbon source, reducing medicament, reduction sewage disposal energy consumption, raising denitrogenation dephosphorizing effect Rate is the primary goal and R＆D direction of current Novel sewage handling process.
The content of the invention
The technical problem to be solved is to provide a kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment and its side Method, successfully solves and has that utilization of carbon source in raw water is insufficient, Dephosphorization reagent dosage mistake in traditional biological aerated filter process Greatly, biofilter backwashing period frequently, the low problem of denitrogenation dephosphorizing efficiency.The sewage treatment process and its system have raw water Middle utilization of carbon source rate is high, purification sewage efficiency high, process effluent quality it is good the characteristics of, system structure is simple, with low cost, has Great application value.
For achieving the above object, a kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment of the present invention, the wastewater treatment system System is sequentially connected in series connection and is constituted by film mud coupling pond, sedimentation tank, aerobic nitrification biofilter, chemical dephosphorization pond, described precipitation Pond couples with film mud and be provided between pond sludge refluxing apparatus, and described aerobic nitrification biofilter couples with film mud and be provided between pond nitrification Liquid reflux.
Described sludge refluxing apparatus include sludge reflux pump and sludge return pipe, and return sludge ratio is 10% ~ 200%.
Described nitrification liquid return-flow system includes nitrification liquid reflux pump and nitrification liquid reflux line, and mixed liquid recycle ratio is 10%~400%。
Described film mud coupling pond is that film mud couples anoxic pond or film mud coupling anaerobic pond；Described film mud coupling Chi Weiliu Dynamic formula film mud couples pond or fixed film-mud coupling pond.
Described flow-type film mud coupling pond peripheral effluent is provided with mesh isolating device；Described flow-type film mud coupling pond It is interior including agitating device, water distribution system, suspension biofilm carrier, biomembrane and suspension sludge.
Described agitating device is underwater stirrer or plug flow device under water, and the quantity of described agitating device is at least 1 Group, described suspension biofilm carrier filling rate is 5% ~ 70%.
Include water distribution system, fixed type biological membrane carrier, biomembrane and suspension in described fixed film mud coupling pond Sludge.
Described chemical dephosphorization pond includes Dephosphorization reagent dosing system, agitating device, chemical dephosphorization pond body, discharge pipeline, Chemical dephosphorization pond body is high-efficiency coagulative precipitation tank or magnetic-coagulation sedimentation tank.
The method of wastewater treatment step of the bicirculating denitrogenation dephosphorizing Waste Water Treatment of the present invention is as follows：
（1）Film mud is flowed into after the nitrification liquid mixing that pending sewage flows back with clear water reserviors from the water distribution system of bottom couple pond, Biofilm carrier, the surface of suspension sludge and growth inside in film mud coupling pond hydrolysis acidification microorganism and obligate anti-nitre Change microorganism, the mixed liquid recycle ratio between film mud coupling pond and clear water reserviors is 10% ~ 400%, waste water reacts in film mud coupling pond 1h~12h。
（2）Mud-water separation is reacted：The water outlet in film mud coupling pond is entered in sedimentation tank, is made by the physical sedimentation of sedimentation tank With enabling the biomembrane that comes off on the suspension sludge remained in the coupling pond water outlet of film mud and suspended biological membrane carrier to settle simultaneously Realize mud-water separation；To supplement the strain in mud film coupling pond, the sludge of sedimentation is extracted to film mud coupling by sludge reflux pump Close in pond, return sludge ratio is 10% ~ 200%.The concentration of suspension in sedimentation tank water outlet is set to be less than 70mg/L.
（3）Nitrification, except carbon reaction：Water outlet Jing after sedimentation tank process enters aerobic nitrification biofilter, and dissolved oxygen is 2.5 ~ 8.0mg/L, hydraulic detention time is 0.5h ~ 12h.Obligate aerobic nitrification bacterium of the apposition growth on biologic packing material layer is by ammonia nitrogen Nitrate nitrogen is oxidized to, aerobic heterotrophic bacteria of the apposition growth on biologic packing material layer is by a small amount of remaining organic matter removal, and Jing is good Used as nitrification liquid backflow water, part water outlet is intake as chemical dephosphorization pond for part water outlet after the biofilter process of oxygen nitrification.
（4）Except phosphorus reaction：Water outlet Jing the retention of aerobic nitrification biofilter, after filtering enters chemical dephosphorization pond.By throwing Plus chemical dephosphorization medicament, the total phosphorus in sewage is removed, produce chemical sludge and then periodically discharged by discharge pipeline, through mud-water separation Standard water discharge discharge.
Energy effectively solving conventional aeration biofilter pretreatment of the invention is complicated, backwash is frequently and to raw water utilization of carbon source Insufficient the problems such as, Nitrogen/Phosphorus Removal is improved, have the features such as low cost, biological multiplication concurrently, final outflow water qualified discharge has Great application value.
Description of the drawings
Fig. 1 is the bicirculating denitrogenation dephosphorizing Waste Water Treatment of flow-type film mud coupling pond type.
1st, inlet channel, 2, elevator pump, 3, flow-type film mud coupling pond, 4, suspension sludge and suspended biological membrane carrier are mixed Close area, 5, water distribution system, 6, suspension sludge, 7, suspended biological membrane carrier, 8, agitating device, 9, mesh isolating device, 10, go out Water channel, 11, connecting pipe, 12, sedimentation tank, 13, sludge return pipe, 14, sludge reflux pump, 15, effluent weir, 16, connecting tube Road, 17, aerobic nitrification biofilter, 18, highly effective air bubbler, 19, water distribution system, 20, nitrification biologic packing material layer, 21, go out Pool, 22, outlet canal, 23, aerator, 24, steam line, 25, connecting pipe, 26, chemical dephosphorization pond, 27, dephosphorization dosing System, 28, agitator, 29, outlet canal, 30, drainage pipeline, 31, spoil disposal pipeline, 32, nitrification liquid reflux pump, 33, nitrification liquid returns Flow tube road.
Fig. 2 is the bicirculating denitrogenation dephosphorizing Waste Water Treatment of fixed film mud coupling pond type.
1', inlet channel, 2', elevator pump, 3', fixed film-mud coupling pond, 4', suspension sludge and fixed biofilm Carrier mixed zone, 5', water distribution system, 6', suspension Sludge Bed, 7', fixed biofilm carrier, 8', outlet canal, 9', connecting tube Road, 10', sedimentation tank, 11', sludge return pipe, 12', sludge reflux pump, 13', tube settling district, 14', effluent weir, 15', Connecting pipe, 16', aerobic nitrification biofilter, 17', highly effective air bubbler, 18', water distribution system, 19', fixed biology are filled out The bed of material, 20', exhalant region, 21', outlet canal, 22', aerator, 23', steam line, 24', connecting pipe, 25', chemistry are removed Phosphorus pond, 26', medicine system, 27', agitator, 28', outlet canal, 29', drainage pipeline, 30', spoil disposal pipeline, 31', nitrification liquid Reflux pump, 32', nitrification liquid reflux line.
Fig. 3 is bicirculating denitrogenation dephosphorizing Waste Water Treatment process chart.
Specific embodiment
Fig. 1 embodiments（The bicirculating denitrogenation dephosphorizing Waste Water Treatment of flow-type film mud coupling pond type）
（1）Hydrolysis, anti-nitration reaction：After treatment sewage mixes with the nitrification liquid of backflow in the water inlet pipe 1 lifted by elevator pump 2 Flow in flow-type film mud coupling pond 3 via water distribution system 5, suspension sludge 6 and suspension bio-carrier 7 constitute suspension Sludge and suspended biological membrane carrier mixed zone 4, biofilm carrier 7, the surface of suspension sludge 6 and growth inside hydrolysis acidification Microorganism and obligate denitrifying microorganism, agitating device 8 mixes treatment sewage with suspension sludge 6, suspension bio-carrier 7 Close uniform, to improve interfacial mass transfer and sewage treating efficiency, the mixed liquid recycle ratio between flow-type film mud coupling pond 3 and clear water reserviors For 10% ~ 400%, sewage flows into sedimentation tank 12 after reacting 1h ~ 12h in flow-type film mud coupling pond.
（2）Mud-water separation is reacted：Flow-type film mud coupling pond 3 process after sewage Jing mesh isolating device 9 filtration after according to Secondary entrance outlet canal 10, connecting pipe 11 and sedimentation tank 12, are acted on by the physical sedimentation of sedimentation tank 12, make flow-type film mud coupling Close the biomembrane come off on the suspension sludge 6 and suspended biological membrane carrier 7 remained in the water outlet of pond 3 to be able to settle and realize muddy water Separate, be to supplement the strain in mud film coupling pond, the sludge of sedimentation is flowed back by sludge return pipe 13 and sludge reflux pump 14 To flow-type film mud coupling pond, return sludge ratio is 10% ~ 200%, and settled sewage then passes through effluent weir 15, connecting pipe 16 Into in aerobic nitrification biofilter 17, the concentration of suspension in sedimentation tank water outlet is less than 70mg/L.
（3）Nitrification, except carbon reaction：It is biological that sewage Jing after the process of sedimentation tank 12 enters aerobic nitrification by water distribution system 19 Nitrification biologic packing material layer 20 in filter tank 17, aerating system is by aerator 23, steam line 24,18 groups of highly effective air bubbler Into the dissolved oxygen controlled by aerating system is 2.5 ~ 8.0mg/L, and its hydraulic detention time is 0.5h ~ 12h, and nitrification liquid flows back Than 50% ~ 200%.Ammonium oxidation is nitrate nitrogen by obligate aerobic nitrification bacterium of the apposition growth on biologic packing material layer 20, is adhered to The aerobic heterotrophic bacteria on biologic packing material layer 20 is grown in by a small amount of remaining organic matter removal, at Jing aerobic nitrifications biofilter 17 Jing exhalant regions 21 flow into outlet canal 22 after reason, and its part water outlet is then by nitrification liquid reflux pump 32 and nitrification liquid reflux line 33 times In flowing to flow-type film mud coupling pond 3, part water outlet is then entered in chemical dephosphorization pond 26 by connecting pipe 25.
（4）Except phosphorus reaction：Water outlet after retaining, filter Jing aerobic nitrification biofilter 17 enters chemical dephosphorization pond 26.Stir Mix chemical dephosphorization medicament that device 28 adds dephosphorization medicine system 27 and the sewage into chemical dephosphorization pond be sufficiently mixed uniformly, with Reach and efficiently remove total phosphorus purpose in sewage, produce chemical sludge and then periodically discharged by discharge pipeline 31, through mud-water separation Standard water discharge is discharged.
Fig. 2 embodiments（Fixed film mud couples the bicirculating denitrogenation dephosphorizing Waste Water Treatment of pond type）
（1）Hydrolysis, anti-nitration reaction：Treatment sewage mixes with the nitrification liquid of backflow in the water inlet pipe 1' lifted by elevator pump 2' By being flowed in fixed film-mud coupling pond 3' by water distribution system 5', suspension sludge 6' and fixed biofilm carrier 7' is constituted Suspension sludge and fixed biofilm carrier mixed zone mixed zone 4', fixed biofilm carrier 7', the table of suspension sludge 6' Face and growth inside hydrolysis acidification microorganism and obligate denitrifying microorganism, and fixed film-mud is coupled between pond 3' and clear water reserviors Mixed liquid recycle ratio be 10% ~ 400%, sewage flows into sedimentation tank 10' after reacting 1h ~ 12h in fixed film-mud coupling pond.
（2）Mud-water separation is reacted：Fixed film mud coupling pond 3' process after sewage Jing outlet canal 8', connecting pipe 9' and Sedimentation tank 10', is acted on by the physical sedimentation of sedimentation tank 10', makes the suspension remained in fixed film mud coupling pond 3' water outlets The biomembrane come off on sludge 6' and fixed biofilm carrier 7' is able to rapid subsidence and realizes muddy water by tube settling district 13' Separate, be to supplement the strain in mud film coupling pond, the sludge of sedimentation is returned by sludge return pipe 11' and sludge reflux pump 12' It flow in fixed film-mud coupling pond 3', return sludge ratio is 10% ~ 200%, and settled sewage is then by effluent weir 14', connection Pipeline 15' is entered in the 16' of aerobic nitrification biofilter, and the concentration of suspension in sedimentation tank water outlet is less than 70mg/L.
（3）Nitrification, except carbon reaction：Sewage Jing after sedimentation tank 10' process is given birth to by water distribution system 18' into aerobic nitrification Nitrification biologic packing material layer 19' in the 16' of thing filter tank, aerating system is by aerator 22', steam line 23', highly effective air diffusion Device 17' is constituted, and the dissolved oxygen controlled by aerating system is 2.5 ~ 8.0mg/L, and its hydraulic detention time is 0.5h ~ 12h, is nitrified Liquid reflux ratio 50% ~ 200%.Ammonium oxidation is nitrate by obligate aerobic nitrification bacterium of the apposition growth on biologic packing material layer 19' Nitrogen, aerobic heterotrophic bacteria of the apposition growth on biologic packing material layer 19' is by a small amount of remaining organic matter removal, and Jing aerobic nitrifications are biological Jing exhalant regions 20' flows into outlet canal 21' after filter tank 16 ' is processed, and its water outlet then enters chemical dephosphorization pond by connecting pipe 24' In 25'.
（4）Except phosphorus reaction：Water outlet Jing aerobic nitrification biofilter 16' retentions, after filtering enters chemical dephosphorization pond 25'. Chemical dephosphorization medicament that agitator 27' adds dephosphorization medicine system 26' and the sewage into chemical dephosphorization pond 25' are sufficiently mixed Uniformly, efficiently remove total phosphorus purpose in sewage to reach, produce chemical sludge and then periodically discharged by discharge pipeline 30', Jing Guoni The detached water outlet of water enters outlet canal, and foul water fraction passes through nitrification liquid reflux pump 31' and nitrification liquid reflux line 32' in exhalant region In being back to flow-type film mud coupling pond 3', partly by outlet canal 28' and drainage pipeline 29' discharge systems.
Embodiment 1
Certain sewage treatment plants, the m for the treatment of capacity 10,0003/ d, inlet COD concentration is 240mg/L, TP 12mg/L, NH3-N（Ammonia Nitrogen）Concentration is 42mg/L, TN（Total nitrogen）60mg/L, float（SS）135 mg/L.Sewage sequentially passes through the coupling of flow-type film mud Pond, sedimentation tank, aerobic nitrification biofilter, chemical dephosphorization pond are processed.Flow-type film mud couples the tank waterpower time of staying for 2h, nitre It is 130% to change liquid reflux ratio, return sludge ratio 50%；Aerobic nitrification biofilter dissolved oxygen is 4.0mg/L, and hydraulic detention time is 3h.Final outflow water meets《Urban wastewater treatment firm pollutant emission standard》(GB18918-2002) one-level emission standard A in.
Embodiment 2
Certain chemical wastewater treatment factory, the m for the treatment of capacity 0.3 ten thousand3/ d, inlet COD concentration is 2240mg/L, TP 42mg/L, NH3-N （Ammonia nitrogen）Concentration is 90mg/L, TN（Total nitrogen）600mg/L, float（SS）635 mg/L.Sewage sequentially passes through flow-type film mud Coupling pond, sedimentation tank, aerobic nitrification biofilter, chemical dephosphorization pond are processed.Flow-type film mud coupling the tank waterpower time of staying be 12h, mixed liquid recycle ratio is 280%, return sludge ratio 80%；Aerobic nitrification biofilter dissolved oxygen be 5.0mg/L, hydraulic retention Time is 12h.Final outflow water COD concentration is 110mg/L, TP 0.03mg/L, NH3-N（Ammonia nitrogen）Concentration is 3mg/L, TN（Always Nitrogen）58mg/L, float（SS）11mg/L.
Embodiment 3
Certain sewage treatment plants, the m for the treatment of capacity 10,0003/ d, inlet COD concentration is 220mg/L, TP 11mg/L, NH3-N（Ammonia Nitrogen）Concentration is 46mg/L, TN（Total nitrogen）65mg/L, float（SS）115 mg/L.Sewage sequentially passes through fixed film-mud coupling Chi Chi, sedimentation tank, aerobic nitrification biofilter, chemical dephosphorization pond are processed.Fixed film-mud coupling pond tank waterpower the time of staying is 1h, mixed liquid recycle ratio is 150%, return sludge ratio 70%；Aerobic nitrification biofilter dissolved oxygen be 5.0mg/L, hydraulic retention Time is 2h.Final outflow water meets《Urban wastewater treatment firm pollutant emission standard》(GB18918-2002) one-level A discharge in Standard.
Embodiment 4
Certain chemical wastewater treatment factory, the m for the treatment of capacity 0.4 ten thousand3/ d, inlet COD concentration is 2240mg/L, TP 42mg/L, NH3-N （Ammonia nitrogen）Concentration is 90mg/L, TN（Total nitrogen）600mg/L, float（SS）635 mg/L.Sewage sequentially passes through fixed film-mud Coupling Chi Chi, sedimentation tank, aerobic nitrification biofilter, chemical dephosphorization pond are processed.When fixed film-mud coupling pond tank waterpower is stopped Between be 11h, mixed liquid recycle ratio is 250%, return sludge ratio 100%；Aerobic nitrification biofilter dissolved oxygen be 5.0mg/L, water The power time of staying is 12h.Final outflow water COD concentration is 140mg/L, TP 0.05mg/L, NH3-N（Ammonia nitrogen）Concentration is 3mg/ L, TN（Total nitrogen）65mg/L, float（SS）9mg/L.

Claims (9)

1. a kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment, it is characterised in that：The Waste Water Treatment is by film mud coupling Close pond, sedimentation tank, aerobic nitrification biofilter, chemical dephosphorization pond and be sequentially connected in series connection composition, described sedimentation tank and film mud coupling Close and sludge refluxing apparatus are provided between pond, described aerobic nitrification biofilter couples with film mud and be provided between pond nitrification liquid backflow dress Put.
2. a kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment according to claim 1, it is characterised in that：Described dirt Mud reflux includes sludge reflux pump and sludge return pipe, and return sludge ratio is 10% ~ 200%.
3. a kind of bicirculating denitrogenation dephosphorizing Waste Water Treatment according to claim 1, it is characterised in that：Described nitre Changing liquid reflux includes nitrification liquid reflux pump and nitrification liquid reflux line, and mixed liquid recycle ratio is 10% ~ 400%.
4. described bicirculating denitrogenation dephosphorizing Waste Water Treatment is required according to right 1, it is characterised in that：Described film mud coupling It is that film mud couples anoxic pond or film mud coupling anaerobic pond to close pond；Described film mud coupling pond is that flow-type film mud couples pond or fixation Formula film mud couples pond.
5. bicirculating denitrogenation dephosphorizing Waste Water Treatment according to claim 4, it is characterised in that：Described flow-type Film mud coupling pond peripheral effluent is provided with mesh isolating device；Include agitating device, water distribution in described flow-type film mud coupling pond System, suspension biofilm carrier, biomembrane and suspension sludge.
6. bicirculating denitrogenation dephosphorizing Waste Water Treatment according to claim 5, it is characterised in that：Described stirring dress Underwater stirrer or under water plug flow device are set to, the quantity of described agitating device is at least 1 group, described suspension biomembrane Carrier filling rate is 5% ~ 70%.
7. the bicirculating denitrogenation dephosphorizing Waste Water Treatment according to right 4, it is characterised in that：Described fixed film mud Coupling includes water distribution system, fixed type biological membrane carrier, biomembrane and suspension sludge in pond.
8. bicirculating denitrogenation dephosphorizing Waste Water Treatment according to claim 1, it is characterised in that：Chemical dephosphorization Chi Bao Dephosphorization reagent dosing system, agitating device, chemical dephosphorization pond body, discharge pipeline are included, chemical dephosphorization pond body is heavy for highly effective coagulation Shallow lake pond or magnetic-coagulation sedimentation tank.
9. a kind of method of wastewater treatment of bicirculating denitrogenation dephosphorizing Waste Water Treatment according to claim 1, its work Skill step is as follows：
（1）Hydrolysis, denitrogenation, except carbon reaction：The nitrification liquid that pending sewage flows back with clear water reserviors mix after from the water distribution of bottom System flows into film mud coupling pond, and the biofilm carrier, the surface of suspension sludge and growth inside in film mud coupling pond hydrolysis Acidifying microbes and obligate denitrifying microorganism, the mixed liquid recycle ratio between film mud coupling pond and clear water reserviors is 10% ~ 400%, is given up Water reacts 1h ~ 12h in film mud coupling pond；
（2）Mud-water separation is reacted：The water outlet in film mud coupling pond is entered in sedimentation tank, is acted on by the physical sedimentation of sedimentation tank, is made The suspension sludge remained in the coupling pond water outlet of film mud and the biomembrane come off on suspended biological membrane carrier are able to settle and realize Mud-water separation；To supplement the strain in mud film coupling pond, the sludge of sedimentation is extracted to film mud by sludge reflux pump and couples pond Interior, return sludge ratio is 10% ~ 200%, makes the concentration of suspension in sedimentation tank water outlet be less than 70mg/L；
（3）Nitrification, except carbon reaction：Jing sedimentation tank process after water outlet enter aerobic nitrification biofilter, dissolved oxygen be 2.5 ~ 8.0mg/L, hydraulic detention time is 0.5h ~ 12h；Obligate aerobic nitrification bacterium of the apposition growth on biologic packing material layer is by ammonia nitrogen oxygen Nitrate nitrogen is turned to, aerobic heterotrophic bacteria of the apposition growth on biologic packing material layer is by a small amount of remaining organic matter removal, and Jing is aerobic Part water outlet after the process of nitrification biofilter is intake as nitrification liquid backflow water, part water outlet as chemical dephosphorization pond；
（4）Except phosphorus reaction：Water outlet Jing the retention of aerobic nitrification biofilter, after filtering enters chemical dephosphorization pond, and described is aerobic The dissolved oxygen of nitrification biofilter is 2.5 ~ 8.0mg/L, and hydraulic detention time is 0.5h ~ 12h；By adding chemical dephosphorization medicine Agent, removes the total phosphorus in sewage, produces chemical sludge and is then periodically discharged by discharge pipeline, arranges through the standard water discharge of mud-water separation Put.
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