CN104529081A - Treatment process for domestic sewage - Google Patents
Treatment process for domestic sewage Download PDFInfo
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- CN104529081A CN104529081A CN201410849508.9A CN201410849508A CN104529081A CN 104529081 A CN104529081 A CN 104529081A CN 201410849508 A CN201410849508 A CN 201410849508A CN 104529081 A CN104529081 A CN 104529081A
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Abstract
The invention discloses a treatment process for domestic sewage. After being pretreated, the sewage is sequentially treated by a primary sedimentation tank, a biological tank and a secondary sedimentation tank, wherein the biological tank comprises an anoxic zone, an anaerobic zone, a second anoxic zone, a second anaerobic zone, a third anoxic zone and an aerobic zone. As low DO, the anaerobic zones and the anoxic zones are arranged alternately, competitive equilibrium of filamentous bacteria and zoogloea is facilitated, the sewage treatment effect is improved, expansion of filamentous bacterium sludge can be prevented, and the cost of sewage treatment is greatly reduced.
Description
Technical field
The invention belongs to technical field of sewage, be specifically related to the treatment process of one way of life sewage.
Background technology
Activated sludge process is application the most a kind of sewage treatment process within the scope of the world today, along with this technique updating in production practice, particularly in recent decades on the basis of its biological respinse and purification mechanism being carried out to extensively research, activated sludge process is greatly improved, define the activated sludge process A/O method of improvement, A/O method obtains, except degraded, also having the function of certain denitrogenation dephosphorizing except making organic pollutant.A section DO is not more than 0.2mg/L, O section DO is 2 ~ 4mg/L, anoxic section heterotrophic bacterium, the suspended substances such as the starch in sewage, fiber, carbohydrate and dissolved organic matter are hydrolyzed to organic acid, larger molecular organics resolves into small organic molecule, insoluble organism is converted into dissolved organic matter, when these products through anaerobic hydrolysis enter aerobic section process, the efficiency of biodegradability in sewage and oxygen can be improved.In anoxic section, the pollutent such as protein, fat can be carried out ammonification (N in organic chain or the amino in amino acid) and to dissociate ammonia (NH by heterotrophic bacterium
3, NH
4 +), at aerobic section, the nitrification of autotrophic bacteria is by NH
4 +be oxidized to NO
3 -, be back to anoxic section by backflow control, the denitrification of heterotrophic bacterium will be reduced into molecular state nitrogen (N
2), complete C, N, O circulation in ecology, realize sewage harmless treatment.A/O method has the advantages such as processing efficiency is high, effluent quality is good, but also there is a stubborn problem, is exactly sludge bulking.The main manifestations of sludge bulking is that sludge structure is loose, precipitation compression performance is poor, SV value increases, secondary sedimentation basins is difficult to solid-liquid separation, cause a large amount of sludge loss, water outlet is muddy, and returned sluge concentration is low, sometimes also produce with a large amount of foams, directly affect the normal operation of whole biochemical system.Investigation display, the sludge bulking of more than 90% is all caused by hyphomycetic amount reproduction, and Filamentous Bulking not only affects effluent quality, and its excessive multiplication also can produce a large amount of foams, seriously jeopardizes the operation of sewage work.
Summary of the invention
It is short, effective that the technical problem to be solved in the present invention is to provide a kind of sewage disposal time, and effectively can prevent the domestic sewage treatment process of sludge bulking.
Technical scheme provided by the invention is the treatment process of one way of life sewage, sewage after pretreatment, primary sedimentation pond, biological tank and secondary sedimentation basins process successively, it is characterized in that: described biological tank comprises anoxic section, anaerobism section, the second anoxic section, the second anaerobism section, the 3rd anoxic section, aerobic section;
Sewage and enter anoxic section after mixing from the returned sluge of second pond and process, dwell time of sewage is 0.3h;
The water outlet of anoxic section enters the process of anaerobism section, and dwell time of sewage is 0.2h;
The water outlet of anaerobism section enters the second anoxic section process, and dwell time of sewage is 0.4h;
The water outlet of anoxic section enters the second anaerobism section process, and dwell time of sewage is 0.5h;
The water outlet of the second anaerobism section and processing from entering the 3rd anoxic section after the sewage mixing of the backflow of aerobic section, sewage backflow rate is 50 ~ 75%, and dwell time of sewage is 0.5h;
The water outlet of the 3rd anoxic section enters aerobic section and processes, dwell time of sewage is 0.5h, part effluent recycling is to the 3rd anoxic section, all the other water outlets enter second pond and carry out precipitate and separate, sewage after process is discharged through discharge outlet, partial sludge is back to pre-anoxic section, and other mud enter sludge treating system.
The DO of above-mentioned anoxic section, the second anoxic section, the 3rd anoxic section is 0.2 ~ 0.5mg/L.
DO≤the 0.2mg/L of above-mentioned anaerobism section, the second anaerobism section.
The DO of above-mentioned aerobic section is 0.5 ~ 0.8mg/L.
Compared with prior art, the present invention has following beneficial effect:
1) biological tank maintains lower DO level, is conducive to hyphomycetic suitable breeding, forms not breakable reticulated structure flco, can adsorb the fine particle in trap water and free bacteria, improves the clearance of SS.Hyphomycetic suitable breeding can also accelerate the degradation rate of substrate, improves processing efficiency, reduces dwell time of sewage.
2) anaerobism and anoxic section are arranged alternately, and aerobic section sewage divides two strands to be back to anoxic section, hyphomycetic excessive breeding can be suppressed again, ensure that thread fungus and zoogloea are in equilibrium state all the time, effectively prevent the generation of Filamentous Bulking.
3) being arranged alternately of anoxic section and aerobic section, contributes to synchronously carrying out of nitrification and denitrification, and the carrying out of short distance nitration, substantially increases the degradation efficiency of sewage, also reduces the generation of sludge quantity, reduce follow-up sludge treatment cost.
Embodiment
The present invention is further elaborated for following specific embodiment, but not as a limitation of the invention.
Embodiment 1
By sewage after pretreatment, primary sedimentation pond, biological tank and secondary sedimentation basins process successively, and described biological tank comprises anoxic section, anaerobism section, the second anoxic section, the second anaerobism section, the 3rd anoxic section, aerobic section;
Sewage and enter anoxic section (DO 0.2 ~ 0.5mg/L) after mixing from the returned sluge of second pond and process, dwell time of sewage is 0.3h;
The water outlet of anoxic section enters anaerobism section (DO≤0.2mg/L) process, and dwell time of sewage is 0.2h;
The water outlet of anaerobism section enters the second anoxic section (DO0.2 ~ 0.5mg/L) process from after the backflow sewage mixing of aerobic section, and sewage backflow rate is 20 ~ 50%, and dwell time of sewage is 0.4h;
The water outlet of anoxic section enters the second anaerobism section (DO≤0.2mg/L) process, and dwell time of sewage is 0.5h;
The water outlet of the second anaerobism section and processing from entering the 3rd anoxic section (DO 0.2 ~ 0.5mg/L) after the sewage mixing of the backflow of aerobic section, sewage backflow rate is 20 ~ 50%, and dwell time of sewage is 0.5h;
The water outlet of the 3rd anoxic section enters aerobic section (DO 0.5 ~ 0.8mg/L) and processes, dwell time of sewage is 0.5h, part effluent recycling to the second anoxic section and the 3rd anoxic section, all the other water outlets enter second pond and carry out precipitate and separate, sewage after process is discharged through discharge outlet, partial sludge is back to pre-anoxic section, and other mud enter sludge treating system.
Experimental example
For certain municipal sewage plant, adopt A/O treatment process, table 1 is the actual operating data in 2013 continuous four months of in January, 10 ~ 2014 of this factory, and its water outlet reaches secondary standard in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002).This factory started to adopt treatment process of the present invention 3 ~ June in 2014, detected this water outlet of four months and reached one-level A standard in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) completely, refer in table 2.
Table 1
Table 2
Claims (4)
1. the treatment process of one way of life sewage, sewage after pretreatment, primary sedimentation pond, biological tank and secondary sedimentation basins process successively, it is characterized in that: described biological tank comprises anoxic section, anaerobism section, the second anoxic section, the second anaerobism section, the 3rd anoxic section, aerobic section;
Sewage and enter anoxic section after mixing from the returned sluge of second pond and process, dwell time of sewage is 0.3h;
The water outlet of anoxic section enters the process of anaerobism section, and dwell time of sewage is 0.2h;
The water outlet of anaerobism section enters the second anoxic section process from after the backflow sewage mixing of aerobic section, and sewage backflow rate is 20 ~ 50%, and dwell time of sewage is 0.4h;
The water outlet of anoxic section enters the second anaerobism section process, and dwell time of sewage is 0.5h;
The water outlet of the second anaerobism section and processing from entering the 3rd anoxic section after the sewage mixing of the backflow of aerobic section, sewage backflow rate is 20 ~ 50%, and dwell time of sewage is 0.5h;
The water outlet of the 3rd anoxic section enters aerobic section and processes, dwell time of sewage is 0.5h, part effluent recycling to the second anoxic section and the 3rd anoxic section, all the other water outlets enter second pond and carry out precipitate and separate, sewage after process is discharged through discharge outlet, partial sludge is back to pre-anoxic section, and other mud enter sludge treating system.
2. the treatment process of one way of life sewage according to claim 1, is characterized in that: the DO of anoxic section is 0.2 ~ 0.5mg/L.
3. the treatment process of one way of life sewage according to claim 1, is characterized in that: the DO≤0.2mg/L of anaerobism section.
4. the treatment process of one way of life sewage according to claim 1, is characterized in that: the DO of aerobic section is 0.5 ~ 0.8mg/L.
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|---|---|---|---|
| CN201410849508.9A CN104529081B (en) | 2014-12-31 | 2014-12-31 | The treatment process of one way of life sewage |
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|---|---|---|---|
| CN201410849508.9A CN104529081B (en) | 2014-12-31 | 2014-12-31 | The treatment process of one way of life sewage |
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| CN104529081A true CN104529081A (en) | 2015-04-22 |
| CN104529081B CN104529081B (en) | 2016-01-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174642A (en) * | 2015-10-10 | 2015-12-23 | 北京市市政工程设计研究总院有限公司 | Efficient biological denitrification method for sewage |
| CN107739085A (en) * | 2017-11-28 | 2018-02-27 | 唐毅 | A kind of high efficiency sewage treating agent |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587123A (en) * | 2004-09-16 | 2005-03-02 | 同济大学 | Physiochemical and biochemical interactive city sewage treating method |
| CN104150716A (en) * | 2014-08-20 | 2014-11-19 | 哈尔滨工业大学 | Biology processing apparatus capable of processing sewage at low-temperature with low carbon-nitrogen-ratio in cold region and method for processing sewage at low-temperature with low carbon-nitrogen-ratio in cold region |
| CN104163551A (en) * | 2014-08-29 | 2014-11-26 | 成都市新筑路桥机械股份有限公司 | MUCT-MBR (Modified University of Cape Town-membrane bioreactor) combination technique for sewage treatment |
-
2014
- 2014-12-31 CN CN201410849508.9A patent/CN104529081B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587123A (en) * | 2004-09-16 | 2005-03-02 | 同济大学 | Physiochemical and biochemical interactive city sewage treating method |
| CN104150716A (en) * | 2014-08-20 | 2014-11-19 | 哈尔滨工业大学 | Biology processing apparatus capable of processing sewage at low-temperature with low carbon-nitrogen-ratio in cold region and method for processing sewage at low-temperature with low carbon-nitrogen-ratio in cold region |
| CN104163551A (en) * | 2014-08-29 | 2014-11-26 | 成都市新筑路桥机械股份有限公司 | MUCT-MBR (Modified University of Cape Town-membrane bioreactor) combination technique for sewage treatment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174642A (en) * | 2015-10-10 | 2015-12-23 | 北京市市政工程设计研究总院有限公司 | Efficient biological denitrification method for sewage |
| CN107739085A (en) * | 2017-11-28 | 2018-02-27 | 唐毅 | A kind of high efficiency sewage treating agent |
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| CN104529081B (en) | 2016-01-13 |
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Inventor after: Kong Wenfeng Inventor before: Han Biao Inventor before: Mo Haiyan Inventor before: Song Hongjun Inventor before: Zeng Guangqing Inventor before: Mo Xiankun Inventor before: Zhao Wei Inventor before: Pan Zhengxian Inventor before: Zhang Weiwei Inventor before: Li Cheng Inventor before: Mo Chunyan |
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Effective date of registration: 20170731 Address after: Xianning City, Hubei Province in 437000 Road No. 15 Patentee after: Hubei macwell Environmental Engineering Co. Ltd. Address before: 541004, Guilin, Qixing Road, Qixing District, Guilin, the Guangxi Zhuang Autonomous Region, China National hi tech Zone, University Science Park, room 410 Patentee before: Waste Gas Treatment Guilin Gentral Bank Equipment Co.,Ltd. |
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