CN1242940C - Method for treating urban sewage through denitrifying process for phophorous removal and defluorination - Google Patents
Method for treating urban sewage through denitrifying process for phophorous removal and defluorination Download PDFInfo
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- CN1242940C CN1242940C CNB2003101120093A CN200310112009A CN1242940C CN 1242940 C CN1242940 C CN 1242940C CN B2003101120093 A CNB2003101120093 A CN B2003101120093A CN 200310112009 A CN200310112009 A CN 200310112009A CN 1242940 C CN1242940 C CN 1242940C
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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
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Abstract
The present invention relates to a method for treating municipal sewage through denitrifying phosphorus removal and nitrogen removal. The present invention comprises eight steps, such as a water entrance stage, an anaerobic stage, a still standing inner water change stage, etc.; in the water entrance stage, raw water enters primary reactors A and B at intervals of four hours; in the anaerobic stage, the raw water is circulated in an anaerobic mode in the primary reactors A and B for two hours to release phosphorus; in the still standing inner water change stage, after anaerobic circulation of the primary reactors A and B, the raw water is statically placed for 0.5 hour, and supernatant liquid containing high concentration of phosphorus is drained into a secondary reactor. By using the characteristic of a sequence batch type, nitrogen and phosphorus are removed by denitrifying phosphorus gathering bacteria in a denitrifying phosphorus stage; the removal rate of biologic oxygen demand (BOD5) of organisms is from 90% to 99%, the removal rate of total nitrogen (TN) is as high as 70%, and the total phosphorus (TP) of yielding water is smaller than 0.5 mg/l.
Description
Technical field
The present invention relates to sewage treatment area, saying so more specifically combines the method for carrying out the denitrification dephosphorization denitrification Treating Municipal Sewage with sequencing batch activated sludge with sequencing batch biofilm reactor process.
Background technology
Along with rapid development of economy, more and more higher in recent years to the requirement of environmental quality.Urban sewage treatment technology has had very big progress.Along with improving constantly that dephosphorization, denitrogenation are required, the urban sewage treatment process activated sludge process has obtained an evolution from theory into action, has absorption-biological degradation method (AB method), anaerobic-aerobic method (AO method), anaerobic-anoxic-aerobic method (A of dephosphorization, denitrification effect
2The O method), oxidation ditch process, sequencing batch active sludge have obtained development rapidly.These biological carbon and phosphorous removal technology, because the active sludge in the system is the mixed bacterial of carbon elimination, nitrated, denitrification, polyP bacteria, nitrification can not independently be finished, the absorption of phosphorus need be carried out under aerobic state again, the clearance that makes total nitrogen in the treatment system is only about 30%, handle back water outlet total phosphorus about 1mg/l, do not reach national grade one discharge standard.Therefore in biological nitration and denitrification and dephosphorization process, certainly existing such contradiction:
1, the different mud battle in age of nitrifier and polyP bacteria,
2, the low organic concentration of nitrated requirement, the denitrification organic concentration of having relatively high expectations;
3, the nitrated hyperoxia that requires, denitrification requires hypoxemia;
4, nitrifying process provides nitrate for denitrification process, but the nitrate of nitrifying process itself is when too much, again nitrifying process is produced and suppresses and whole process can not be proceeded;
5, nitrifying process is to produce acid consumption alkali, and denitrification process is to produce basicity.
Summary of the invention
The contriver finds through investigative test, utilizing sequencing batch activated sludge to combine treatment system with sequencing batch biofilm carries out denitrification dephosphorization denitrification and can solve 5 above-mentioned contradictions, and utilize denitrifying phosphorus removing bacteria in anoxic denitrification with the nitric nitrogen for the electron acceptor(EA) excess absorbs phosphorus in the water, dephosphorization and denitrification are finished synchronously.
The purpose of this invention is to provide a kind of sequencing batch activated sludge that utilizes and combine the method that treatment system is carried out the denitrification dephosphorization denitrification Treating Municipal Sewage with sequencing batch biofilm, utilize the characteristics of sequence batch (, utilize denitrification phosphorus-collecting bacterium dephosphorization denitrogenation in the denitrification phosphorus-collecting phase.Make organism biochemical oxygen demand (BOD) (BOD
5) clearance reach 90%～99%, the clearance of total nitrogen (TN) reaches 70%, and makes water outlet total phosphorus (TP) less than 0.5mg/l.
The present invention sees Fig. 1 with the method process flow sheet of sequencing batch activated sludge and sequencing batch biofilm treatment system Treating Municipal Sewage, and wherein first step device is two sequencing batch activated sludge reactors, and second stage device is two sequencing batch biofilm reactors; From advancing former water to water outlet, the first step sequencing batch activated sludge reactor cycle of operation is 8～9 hours, and the second stage sequencing batch biofilm reactor cycle of operation is 4 hours; The water outlet of second stage sequencing batch biofilm reactor alternately entered the reaction of the first step (A, B) sequencing batch activated sludge in time at interval in 4 hours.
The method of denitrification dephosphorization denitrification Treating Municipal Sewage of the present invention comprises the steps:
1. intake the phase: raw water spacer alternately entered first step reactor A and B in 4 hours;
2. anaerobic phase: former water carries out anaerobism circulation 2 hours in A and B, carry out the release of phosphorus;
3. change the water phase in leaving standstill: first step reactor staticly settled 0.5 hour after circulating through anaerobism, and the supernatant that will have high concentration phosphorus enters second stage reactor;
4. nitration reaction phase: in the reactor of the second stage, the high phosphorus water after staticly settling from first step reactor carries out nitration reaction through aerobic aeration 3.5 hours;
5. nitrification liquid internal reflux: second stage reactor staticly settles 30min after nitration reaction finishes, be that nitrification liquid is back to another first step reactor with supernatant liquor;
6. denitrification phosphorus-collecting phase: in first step reactor, the nitrification liquid from second stage reactor is carried out anoxic circulation 1.0 hours, utilize denitrification phosphorus-collecting bacterium dephosphorization denitrogenation;
7. aerobic reaction phase: in first step reactor, anoxic was carried out aerobic aeration 4.0 hours after 1.0 hours, carried out removal and the residual NH of aerobic suction phosphorus and BOD, COD
3-N's is nitrated;
8. sedimentation and drawing phase: first step reactor after aerobic end, staticly settle 0.5 hour after, will handle supernatant liquor discharging up to standard;
Described first step reactor is two sequencing batch activated sludge reactors, and second stage reactor is two sequencing batch biofilm reactors.
The present invention compared with prior art has following advantage:
1. the novel denitrification dephosphorization denitrification treatment process of sequencing batch active sludge and sequencing batch biofilm reactor process bonded can be saved aeration rate and energy consumption, is a kind of sewage water treatment method of sustainability;
2. independently carry out nitration reaction with sequencing batch biofilm reactor, made full use of the peculiar nitrification function of biomembrance process, increased the nitrifier amount of system, improved nitrification efficiency, reduce hydraulic detention time and reactor volume;
3. nitrification is carried out separately, avoided the mud battle in age of nitrifier and dephosphorization bacterial, solved the contradiction that exists in the traditional biological denitrification dephosphorization technique;
4. reduce organic consumption, save the required carbon source of denitrification, be more suitable for the sewage of carbon, nitrogen, phosphorus ratio imbalance.
5. nitrated, denitrogenation, phosphor-removing effect are good.
Embodiment
Treatment sewage is a city domestic sewage, and the sewage disposal step is as follows:
1. water inlet phase: raw water spacer alternately entered first step reactor A and B in 4 hours;
2. anaerobic phase: former water carries out anaerobism circulation 2 hours in A and B, carry out the release of phosphorus;
3. change the water phase in leaving standstill: first step reactor staticly settled 0.5 hour after circulating through anaerobism, and the supernatant that will have high concentration phosphorus enters second stage reactor;
4. nitration reaction phase: in the reactor of the second stage, the high phosphorus water after staticly settling from first step reactor carries out nitration reaction through aerobic aeration 3.5 hours;
5. nitrification liquid internal reflux: second stage reactor staticly settles 30min after nitration reaction finishes, supernatant liquor (nitrification liquid) is back to first step reactor:
6. denitrification phosphorus-collecting phase: in first step reactor, the nitrification liquid from second stage reactor is carried out anoxic circulation 1.0 hours, mainly utilize denitrification phosphorus-collecting bacterium dephosphorization denitrogenation;
7. aerobic reaction phase: in first step reactor, anoxic was carried out aerobic aeration 4.0 hours after 1.0 hours, mainly carried out removal and the residual NH of aerobic suction phosphorus and BOD, COD
3-N's is nitrated;
8. sedimentation and drawing phase: first step reactor after aerobic end, staticly settle 0.5 hour after, will handle supernatant liquor discharging up to standard.
Result is as follows:
(1) urban sewage chemical oxygen requirement concentration (COD) is between the 86.9-250.6 mg/litre, biological oxygen demand (BOD
5) concentration between the 48.7-127.3 mg/litre, adopt technology of the present invention, its effluent COD concentration is less than 30 mg/litre, clearance about 80%, water outlet BOD
5Concentration below 15 mg/litre, clearance is about 90%;
(2) as water inlet NH
3-N concentration adopts technology of the present invention when the 15-25 mg/litre, water outlet reaches below 4 mg/litre substantially,
(3) water inlet total nitrogen (TN) concentration is when the 16.85-25.8 mg/litre, and water outlet TN concentration is below 4 mg/litre, and the clearance of TN is more than 70%;
(4) municipal effluent water inlet total phosphorus (TP) is in the 1.6-7.1 mg/litre, and water outlet can reach below 0.5 mg/litre, system to the clearance of TP more than 90%.
Claims (1)
1, a kind of method of denitrification dephosphorization denitrification Treating Municipal Sewage is characterized in that comprising the steps:
1. intake the phase: raw water spacer alternately entered first step reactor A and B in 4 hours;
2. anaerobic phase: former water carries out anaerobism circulation 2 hours in A and B, carry out the release of phosphorus;
3. change the water phase in leaving standstill: first step reactor staticly settled 0.5 hour after circulating through anaerobism, and the supernatant that will have high concentration phosphorus enters second stage reactor;
4. nitration reaction phase: in the reactor of the second stage, the high phosphorus water after staticly settling from first step reactor carries out nitration reaction through aerobic aeration 3.5 hours;
5. nitrification liquid internal reflux: second stage reactor staticly settles 30min after nitration reaction finishes, be that nitrification liquid is back to another first step reactor with supernatant liquor;
6. denitrification phosphorus-collecting phase: in first step reactor, the nitrification liquid from second stage reactor is carried out anoxic circulation 1.0 hours, utilize denitrification phosphorus-collecting bacterium dephosphorization denitrogenation;
7. aerobic reaction phase: in first step reactor, anoxic was carried out aerobic aeration 4.0 hours after 1.0 hours, carried out the nitrated of the removal of aerobic suction phosphorus and BOD, COD and residual NH3-N;
8. sedimentation and drawing phase: first step reactor after aerobic end, staticly settle 0.5 hour after, will handle supernatant liquor discharging up to standard;
Described first step reactor is two sequencing batch activated sludge reactors, and second stage reactor is two sequencing batch biofilm reactors.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101120093A CN1242940C (en) | 2003-11-04 | 2003-11-04 | Method for treating urban sewage through denitrifying process for phophorous removal and defluorination |
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| CNB2003101120093A CN1242940C (en) | 2003-11-04 | 2003-11-04 | Method for treating urban sewage through denitrifying process for phophorous removal and defluorination |
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| CN1539768A CN1539768A (en) | 2004-10-27 |
| CN1242940C true CN1242940C (en) | 2006-02-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100349810C (en) * | 2005-02-05 | 2007-11-21 | 彭永臻 | AZNdenitrification phosphorus oliminating sewage treatment method and device |
| CN100369830C (en) * | 2006-03-09 | 2008-02-20 | 武汉凯迪水务有限公司 | Waste water treating process of circulation sequence batched active sludge and its active sludge reactor |
| CN103910432B (en) * | 2014-04-22 | 2016-06-08 | 东南大学 | A kind of energy-saving batch-type sanitary sewage nitrogen phosphorus efficiency minimizing technology |
| CN104609659B (en) * | 2015-01-14 | 2016-08-17 | 合肥工业大学 | A kind of method strengthening SBR PROCESS FOR TREATMENT coal chemical industrial waste water denitrification efficiency |
| CN107531530B (en) * | 2015-07-07 | 2021-09-03 | 洪胜男 | Efficient sewage denitrification and dephosphorization process and system |
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