CN101823814B - Method and system of integrated denitrifying phosphorus and nitrogen removal - Google Patents

Method and system of integrated denitrifying phosphorus and nitrogen removal Download PDF

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CN101823814B
CN101823814B CN 201010139094 CN201010139094A CN101823814B CN 101823814 B CN101823814 B CN 101823814B CN 201010139094 CN201010139094 CN 201010139094 CN 201010139094 A CN201010139094 A CN 201010139094A CN 101823814 B CN101823814 B CN 101823814B
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pond
reflux pump
pump
anoxic
anaerobic
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CN101823814A (en
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黄荣新
谌建宇
张�杰
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South China Institute of Environmental Sciences MEE
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Abstract

The invention discloses a method and s system of integrated denitrifying phosphorus and nitrogen removal. The system is formed by sequentially connecting a water inlet pump, an anaerobic tank, a primary sedimentation tank, an aerobic nitrification tank, a secondary sedimentation tank, an anoxic tank, an aeration tank and a final sedimentation tank by a water pipe, wherein the anaerobic tank is internally provided with a stirring device and a surpass reflux pump 1, the surpass reflux pump 1 is connected with the final sedimentation tank through a water pipe; the aerobic nitrification tank is internally provided with an air pump and a nitrification reflux pump, the nitrification reflux pump is connected with the secondary sedimentation tank through a water pipe; and the anoxic tank is internally provided with a stirring device and a surpass reflux pump 2, and the surpass reflux pump 2 is connected with the primary sedimentation tank through a water pipe. The invention is very suitable for the situation with lower COD/N, can utilize the least consumption of COD to obtain the most nitrogen and phosphorus removal efficiency, effectively reduces occupied area, is convenient to operate and maintain, and better solves the defect that the traditional nitrogen and phosphorus removal process has poor effect of simultaneously removing nitrogen and phosphorus .

Description

A kind of method of integrated denitrifying phosphorus and nitrogen removal and system thereof
Technical field
The invention belongs to water pollution control and processing technology field, particularly a kind of integrated denitrifying phosphorus and nitrogen removal method and system thereof, the intensified process system of biological carbon and phosphorous removal when this invention is mainly used in the city domestic sewage that nitrogenous phosphorus pollutes.
Background technology
Traditional biological dephosphorize denitrification technology is to adopt both at home and abroad extensively always, and A/O, A/A/O, SBR technology and multiple improved novel process of knowing like people and distortion thereof can both effectively be removed the nitrogen phosphorus in the waste water like UCT, MUCT, VIP and JHB technology etc.But; Traditional biological denitrogenation and simultaneously denitrification dephosphorization technique exists all that floor space is bigger, initial cost and working cost be higher; Deficiencies such as complicacy are controlled comparatively in operation; And have following drawback: the oxidation of (1) COD and the nitrated power consumption of ammonia nitrogen are huge, and in the COD oxidising process, have lost a large amount of chemical energy that are stored among the COD virtually; When (2) biology of anoxic denitrification and polyP bacteria is released phosphorus there is contention in COD; (3) relate to mud and mix the multiple backflow of phegma in the traditional technology; (4) traditional dephosphorization process is realized the dephosphorization purpose through aerobic discharging excess sludge, and the surplus sludge volume treatment capacity is big, and cost is high; (5) mikrobes such as nitrifier, denitrifying bacteria, polyP bacteria and heterotrophic bacteria all are in same system, and advantage breeding separately influences the stable treated effect.These can not satisfy present WWT less energy-consumption, and high clearance reduces the new demand of secondary pollution.
Summary of the invention
In order to solve the weak point that exists in the above-mentioned prior art, primary and foremost purpose of the present invention is to provide a kind of integrated denitrifying phosphorus and nitrogen removal system; This system takes up an area of compact, is easy to the sewage denitrogenation dephosphorizing processing simultaneously of maintenance operation.
Another object of the present invention is to provide a kind of method of carrying out denitrification dephosphorization denitrification according to above-mentioned integrated denitrifying phosphorus and nitrogen removal system.
To achieve these goals, the present invention adopts following technical scheme:
A kind of integrated denitrifying phosphorus and nitrogen removal system, it is characterized in that: this system is connected in sequence through water pipe by intake pump, anaerobic pond, preliminary sedimentation tank, aerobic nitrification pond, second pond, anoxic pond, stripping pond and final deposition pool; Whipping appts is housed in the said anaerobic pond and surmounts reflux pump 1, surmount reflux pump 1 and be connected with final deposition pool through water pipe; Pneumatic pump and nitrated reflux pump are housed in the said aerobic nitrification pond, and nitrated reflux pump is connected with second pond through water pipe; Whipping appts is housed in the said anoxic pond and surmounts reflux pump 2, surmount reflux pump 2 and be connected with preliminary sedimentation tank through water pipe.
The optimal water power standing time of said anaerobic pond (HRT) is 2~3.0h; The optimal water power standing time in said aerobic nitrification pond is 4.5~9.0h; The optimal water power standing time of said anoxic pond is 3.0~6.0h; The optimal water power standing time in said stripping pond is 10~30min; The optimal water power standing time of said final deposition pool is 1.5~3.0h.
Said anaerobic pond is provided with 3 of thief holes; Said aerobic nitrification pond is provided with 1 of thief hole; Said anoxic pond is provided with 1 of thief hole.
Said aerobic nitrification is provided with aerating apparatus in the pond, and 8 aeration heads are arranged on the aerating apparatus; Said stripping is provided with aerating apparatus in the pond.
A kind of method of carrying out denitrification dephosphorization denitrification according to above-mentioned integrated denitrifying phosphorus and nitrogen removal system comprises following operation steps:
Behind the real life sewage entering equalizing tank with nitrogenous phosphorus, inject anaerobic pond, stir after 2~3h, introduce in the preliminary sedimentation tank, staticly settle 0.75~1.50h, obtain supernatant 1 and anaerobic-anoxic mud via intake pump; Directly pump in anoxic pond through surmounting reflux pump 2 anaerobic-anoxic mud; Supernatant 1 is introduced in the aerobic nitrification pond, in aerobic digestion tank, charged into air, carry out nitration reaction through pneumatic pump; Nitrated liquid after the nitration reaction is introduced in the second pond, staticly settled 0.75~1.5h, obtain supernatant 2 and aerobic sludge; With aerobic sludge in nitrated reflux pump blowback aerobic nitrification pond; Supernatant 2 is introduced in the anoxic pond,, obtained mud mixture with anaerobic-anoxic mud mixing stirring reaction 3~6h; With mud mixture introduce carry out the stripping aeration in the stripping pond after; Introduce in the final deposition pool staticly settling, the gained supernatant is a final outflow water, and the gained throw out is 30~35% according to backflow volume per-cent; In surmounting reflux pump 1 blowback anaerobic pond, the residue throw out is discharged through mud discharging mouth.
The pH value of said sewage is 6~8.
Said is 30~35% with anaerobic-anoxic mud through the backflow volume per-cent that surmounts reflux pump 2 and directly pump in the anoxic pond; Said is 150~200% with the backflow volume per-cent of aerobic sludge in nitrated reflux pump blowback aerobic nitrification pond.
Said anaerobic-anoxic mud is for having the active sludge of denitrifying phosphorus removing bacteria (DPB bacterium); Said aerobic sludge is that nitrobacteria is main active sludge.
Said injection, the flow of introducing, pumping into blowback are 10~20L/h.
Open aerating apparatus in the said nitration reaction, aeration rate is regulated between 3.0~4.5mg/L with control dissolved oxygen (DO); The temperature of said nitration reaction is 20~30 ℃.
Said equalizing tank is exactly to rise to sewage temporarily to deposit here to regulate the follow-up integrated apparatus of back entering, plays the regulating effect of stabilizing water quality.
The purpose of said stripping aeration phase mainly is stripping anoxic section denitrification nitrogen that produces and an activity of strengthening the DPB bacterium; Also has simultaneously faint denitrification dephosphorization function; Effective separation for muddy water also has certain effect, and therefore the SS of water outlet can be controlled preferably.
The present invention compared with prior art has following outstanding advantage and beneficial effect: technology of the present invention is fit to the lower situation of COD/N very much; Can realize utilizing the consumption of minimum COD; Obtain maximum denitrogenation dephosphorizing efficient, lack 30%, oxygen-consumption less 20% than the COD consumption of traditional technology; The sludge quantity that produces few 30%; Can reduce by 30% reactor volume, effectively reduce floor space, running maintenance conveniently, solve traditional denitrification dephosphorization technique preferably and remove the bad drawback of nitrogen phosphorus effect simultaneously.
Description of drawings
Fig. 1 is the integrated denitrification nitrogen and phosphorus removal system diagram of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the B-B sectional view of Fig. 1.
Fig. 4 is the integrated denitrification nitrogen and phosphorus removal method flow diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
Embodiment 1
Integrated denitrification nitrogen and phosphorus removal system is shown in Fig. 1~3: be connected in sequence through water pipe by intake pump, anaerobic pond, preliminary sedimentation tank, aerobic nitrification pond, second pond, anoxic pond, stripping pond and final deposition pool; Whipping appts is housed in the said anaerobic pond and surmounts reflux pump 1, surmount reflux pump 1 and be connected with final deposition pool through water pipe; Pneumatic pump and nitrated reflux pump are housed in the said aerobic nitrification pond, and nitrated reflux pump is connected with second pond through water pipe; Whipping appts is housed in the said anoxic pond and surmounts reflux pump 2, surmount reflux pump 2 and be connected with preliminary sedimentation tank through water pipe.
Utilize above-mentioned integrated denitrification nitrogen and phosphorus removal system that sewage is carried out denitrification nitrogen and phosphorus removal (schema is as shown in Figure 2):
Real life sewage (ammonia-nitrogen content<35mg/L, total phosphorous<5mg/L, COD<300mg/L with nitrogenous phosphorus; The pH value is 6) get into equalizing tank after; Flow with Q=10L/h injects anaerobic pond via intake pump, stirs after the 3h, introduces in the preliminary sedimentation tank; Staticly settle 1.5h, obtain supernatant 1 and anaerobic-anoxic mud (for having the active sludge of denitrifying phosphorus removing bacteria); Anaerobic-anoxic mud is directly pumped into (backflow volume per-cent is 30%) in the anoxic pond through surmounting reflux pump 2; Supernatant 1 is introduced in the aerobic nitrification pond; In aerobic digestion tank, charge into air through pneumatic pump; Carry out nitration reaction 9h (open aerating apparatus in the nitration reaction, aeration rate is regulated between 3.5mg/L with the control dissolved oxygen, and temperature of reaction is controlled at 25 ℃); Nitrated liquid after the nitration reaction is introduced in the second pond, staticly settled 3.0h, obtain supernatant 2 and aerobic sludge (for nitrobacteria is main active sludge); With aerobic sludge in nitrated reflux pump blowback aerobic nitrification pond (backflow volume per-cent is 150%); Supernatant 2 is introduced in the anoxic pond,, obtained mud mixture with anaerobic-anoxic mud mixing stirring reaction 6h; With mud mixture introduce carry out stripping aeration 10min in the stripping pond after; Introduce in the final deposition pool and staticly settle 3h, the gained supernatant is a final outflow water, and the gained throw out is 33% according to backflow volume per-cent; In surmounting reflux pump 1 blowback anaerobic pond, the residue throw out is discharged through mud discharging mouth.Above-mentioned injection, the flow of introducing, pumping into blowback are 10L/h.System sludge age (being exactly to control the phosphor-removing effect that spoil disposal reaches system) (SRT) is 20 days.
The COD that measures water outlet is 32mg/L, and ammonia nitrogen concentration only has 0.50mg/L, and the concentration of total phosphorus effectively is controlled at 0.7mg/L, and total nitrogen concentration is controlled in 5.0mg/L.The clearance of COD, ammonia nitrogen, total phosphorus, total nitrogen has reached 90%, 98%, 87% and 87% respectively, satisfies the one-level B standard of urban wastewater treatment firm pollutant emission standard GB 18918-2002.
Embodiment 2
Utilize the said integrated denitrification nitrogen and phosphorus removal of embodiment 1 system that sewage is carried out denitrification nitrogen and phosphorus removal (schema is as shown in Figure 2):
Real life sewage (ammonia-nitrogen content<35mg/L, total phosphorous<5mg/L, COD<300mg/L with nitrogenous phosphorus; The pH value is 8) get into equalizing tank after; Flow with Q=15L/h injects anaerobic pond via intake pump, stirs after the 2h, introduces in the preliminary sedimentation tank; Staticly settle 1.0h, obtain supernatant 1 and anaerobic-anoxic mud (for having the active sludge of denitrifying phosphorus removing bacteria); Anaerobic-anoxic mud is directly pumped into (backflow volume per-cent is 30%) in the anoxic pond through surmounting reflux pump 2; Supernatant 1 is introduced in the aerobic nitrification pond; In aerobic digestion tank, charge into air through pneumatic pump; Carry out nitration reaction 6h (open aerating apparatus in the nitration reaction, aeration rate is regulated between 3.0mg/L with the control dissolved oxygen, and temperature of reaction is controlled at 20 ℃); Nitrated liquid after the nitration reaction is introduced in the second pond, left standstill heavy 1.5h, obtain supernatant 2 and aerobic sludge (for nitrobacteria is main active sludge); With aerobic sludge in nitrated reflux pump blowback aerobic nitrification pond (backflow volume per-cent is 150%); Supernatant 2 is introduced in the anoxic pond,, obtained mud mixture with anaerobic-anoxic mud mixing stirring reaction 4h; With mud mixture introduce carry out stripping aeration 30min in the stripping pond after; Introduce in the final deposition pool and staticly settle 1.5h, the gained supernatant is a final outflow water, and the gained throw out is 30% according to backflow volume per-cent; In surmounting reflux pump 1 blowback anaerobic pond, the residue throw out is discharged through mud discharging mouth.Above-mentioned injection, the flow of introducing, pumping into blowback are 15L/h.System sludge age (being exactly to control the phosphor-removing effect that spoil disposal reaches system) (SRT) is 20 days.
The COD that measures water outlet is 30mg/L, and ammonia nitrogen concentration only has 1.00mg/L, and the concentration of total phosphorus effectively is controlled within the 0.5mg/L, and total nitrogen concentration is controlled in 5.0mg/L.The clearance of COD, ammonia nitrogen, total phosphorus, total nitrogen has reached 91%, 97%, 88% and 87% respectively, satisfies the one-level A standard of urban wastewater treatment firm pollutant emission standard GB 18918-2002.
Embodiment 3
Utilize the said integrated denitrification nitrogen and phosphorus removal of embodiment 1 system that sewage is carried out denitrification nitrogen and phosphorus removal (schema is as shown in Figure 2):
Real life sewage (ammonia-nitrogen content<35mg/L, total phosphorous<5mg/L, COD<300mg/L with nitrogenous phosphorus; The pH value is 7) get into equalizing tank after; Flow with Q=20L/h injects anaerobic pond via intake pump, stirs after the 2.5h, introduces in the preliminary sedimentation tank; Staticly settle 0.75h, obtain supernatant 1 and anaerobic-anoxic mud (for having the active sludge of denitrifying phosphorus removing bacteria); Anaerobic-anoxic mud is directly pumped into (backflow volume per-cent is 35%) in the anoxic pond through surmounting reflux pump 2; Supernatant 1 is introduced in the aerobic nitrification pond; In aerobic digestion tank, charge into air through pneumatic pump; Carry out nitration reaction 4.5h (open aerating apparatus in the nitration reaction, aeration rate is regulated between 4.5mg/L with the control dissolved oxygen, and temperature of reaction is controlled at 20 ℃); Nitrated liquid after the nitration reaction is introduced in the second pond, staticly settled 1.5h, obtain supernatant 2 and aerobic sludge (for nitrobacteria is main active sludge); With aerobic sludge in nitrated reflux pump blowback aerobic nitrification pond (backflow volume per-cent is 250%); Supernatant 2 is introduced in the anoxic pond,, obtained mud mixture with anaerobic-anoxic mud mixing stirring reaction 3h; With mud mixture introduce carry out stripping aeration 20min in the stripping pond after; Introduce in the final deposition pool and staticly settle 2h, the gained supernatant is a final outflow water, and the gained throw out is 35% according to backflow volume per-cent; In surmounting reflux pump 1 blowback anaerobic pond, the residue throw out is discharged through mud discharging mouth.Above-mentioned injection, the flow of introducing, pumping into blowback are 20L/h.System sludge age (being exactly to control the phosphor-removing effect that spoil disposal reaches system) (SRT) is 20 days.
The COD that measures water outlet is 40mg/L, and ammonia nitrogen concentration only has 3.0mg/L, and the concentration of total phosphorus effectively is controlled at 1.2mg/L, and total nitrogen concentration is controlled in 10.0mg/L.The clearance of COD, ammonia nitrogen, total phosphorus, total nitrogen has reached 85%, 92%, 75% and 80% respectively, satisfies the secondary discharge standard of urban wastewater treatment firm pollutant emission standard GB 18918-2002.
The foregoing description; Particularly embodiment 2 is preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify, and all should be the substitute mode of equivalence, is included within protection scope of the present invention.

Claims (5)

1. the method for a denitrification dephosphorization denitrification is characterized in that comprising following operation steps:
Behind the real life sewage entering equalizing tank with nitrogenous phosphorus, inject anaerobic pond, stir after 2~3h, introduce in the preliminary sedimentation tank, staticly settle 1.0~1.5h, obtain supernatant 1 and anaerobic-anoxic mud via intake pump; Is 30~35% directly to pump in anoxic pond through surmounting reflux pump 2 with backflow volume per-cent with anaerobic-anoxic mud; Supernatant 1 is introduced in the aerobic nitrification pond, in aerobic nitrification tank, charged into air, carry out nitration reaction through pneumatic pump; Nitrated liquid after the nitration reaction is introduced in the second pond, staticly settled 1.0~1.5h, obtain supernatant 2 and aerobic sludge; Is in 150~250% blowback aerobic nitrification ponds with aerobic sludge with backflow volume per-cent through nitrated reflux pump; Supernatant 2 is introduced in the anoxic pond,, obtained mud mixture with anaerobic-anoxic mud mixing stirring reaction 3~6h; With mud mixture introduce carry out the stripping aeration in the stripping pond after; Introduce in the final deposition pool staticly settling, the gained supernatant is a final outflow water, and the gained throw out is 30~35% according to backflow volume per-cent; In surmounting reflux pump 1 blowback anaerobic pond, the residue throw out is discharged through mud discharging mouth; The denitrification dephosphorization denitrification system that the method for said denitrification dephosphorization denitrification adopts is connected in sequence through water pipe by intake pump, anaerobic pond, preliminary sedimentation tank, aerobic nitrification pond, second pond, anoxic pond, stripping pond and final deposition pool; Whipping appts is housed in the said anaerobic pond and surmounts reflux pump 1, surmount reflux pump 1 and be connected with final deposition pool through water pipe; Pneumatic pump and nitrated reflux pump are housed in the said aerobic nitrification pond, and nitrated reflux pump is connected with second pond through water pipe; Whipping appts is housed in the said anoxic pond and surmounts reflux pump 2, surmount reflux pump 2 and be connected with preliminary sedimentation tank through water pipe.
2. method according to claim 1 is characterized in that: the ammonia-nitrogen content<35mg/L in the said real life sewage, and total phosphorous<5mg/L, COD<300mg/L, the pH value is 6~8.
3. method according to claim 1 is characterized in that: said injection, the flow of introducing, pumping into blowback are 10~20L/h.
4. method according to claim 1 is characterized in that: open aerating apparatus in the said nitration reaction, aeration rate is regulated between 3.0~4.5mg/L with the control dissolved oxygen.
5. method according to claim 1 is characterized in that: the temperature of said nitration reaction is 20~30 ℃.
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CN102190401B (en) * 2010-09-28 2012-09-26 浙江浙大海元环境科技有限公司 Method for treating sewage in middle and small towns
CN103086507B (en) * 2013-03-04 2014-08-27 上海市政工程设计研究总院(集团)有限公司 Denitrification and precipitation integrated sewage treatment device and treatment process thereof
CN104129842A (en) * 2013-05-03 2014-11-05 彭志新 Single-tank integrated biochemical treatment process for sewage
CN104692529A (en) * 2015-03-31 2015-06-10 哈尔滨工业大学 Biological phosphorus removal system construction method based on particle and floc coexistence
CN105129989A (en) * 2015-09-11 2015-12-09 同济大学 Process method of MBBR (Moving Bed Biofilm Reactor) for treating urban sewage
CN111847790A (en) * 2020-07-28 2020-10-30 阳江职业技术学院 Integrated biological denitrification device and application method

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CN101041533A (en) * 2007-02-28 2007-09-26 沈阳化工学院 Denitrogenation dephosphorizing technique for integral sewage treatment
CN100503472C (en) * 2007-06-15 2009-06-24 北京工业大学 A2/O+A/O technique wastewater biological denitrification phosphorous removal process and its device
CN101279794B (en) * 2008-04-18 2010-04-14 清华大学 Enhanced endogenous denitrification process and device for denitrification and phosphorus removal by using film-bioreactor

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