CN105174618A - Environment-friendly treatment process of domestic sewage - Google Patents
Environment-friendly treatment process of domestic sewage Download PDFInfo
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- CN105174618A CN105174618A CN201510580995.8A CN201510580995A CN105174618A CN 105174618 A CN105174618 A CN 105174618A CN 201510580995 A CN201510580995 A CN 201510580995A CN 105174618 A CN105174618 A CN 105174618A
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- anaerobic biofilter
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- equalizing tank
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Abstract
The invention discloses a treatment process of domestic sewage. The treatment process comprises the following steps: pretreatment of the sewage: pumping carbon dioxide to carry out aeration for 5-8 minutes and regulating the PH value to 6.5-7.5; two-time cyclic treatment in an anaerobic biofilter and an oxidation regulating tank, wherein the pretreated sewage and returned sludge from a secondary sedimentation tank enter the anaerobic biofilter to be treated after being mixed and the dwell time of the sewage is 10-15 minutes; the effluent of the anaerobic biofilter enters the oxidation regulating tank to be treated and the dwell time of the sewage is 5-8 minutes; the effluent of the oxidation regulating tank reenters the anaerobic biofilter to be retreated and the dwell time of the sewage is 20-25 minutes; the effluent of the anaerobic biofilter enters the oxidation regulating tank to be treated and the dwell time of the sewage is 10-15 minutes; sewage discharge: the treated sewage is discharged via a discharge outlet and the sludge is recovered and enters the anaerobic biofilter.
Description
Technical field
The invention belongs to technical field of sewage, be specifically related to the environment-friendly treating process of one way of life sewage.
Background technology
In people's traditional concept, water is inexhaustible, nexhaustible, but along with the continuous propelling of urbanization, the demand of people to water resources greatly exceed the storage capacity of water resources, after entering the new millennium, also there is in the country that some original water resourcess are enriched the serious situation that water resources is exhausted and pollute.According to relevant data display, 2010, China's urban sewage discharge total amount was up to 1050 billion cubic meters, and the processing rate of these sewage is less than 50%, and therefore, city domestic sewage process is still faced with severe situation.So, we just are extremely necessary to learn about common sewage treatment process, by analyzing, find out correct method, promote the sustainable development of China's city domestic sewage process engineering construction.
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 (NH3, NH4+) by heterotrophic bacterium, at aerobic section, NH4+ is oxidized to NO3-by the nitrification of autotrophic bacteria, anoxic section is back to by backflow control, the denitrification of heterotrophic bacterium will be reduced into molecular state nitrogen (N2), 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.Prior art is disclosed a kind of technique, is arranged alternately three times by anoxic section and aerobic section, contributes to synchronously carrying out of nitrification and denitrification, and the carrying out of short distance nitration, substantially increase the degradation efficiency of sewage, also reduce the generation of sludge quantity, reduce follow-up sludge treatment cost.
The present invention aims to provide a kind of environment-friendly treating process of new sanitary sewage, particularly substantially improve pre-treating process for sewage, as long as and anoxic section and aerobic section alternately arrange twice, just can reach good wastewater treatment efficiency, the increase of sludge quantity also significantly reduces.Such technique have not been reported.
Summary of the invention
Based on the technical problem that background technology exists, the present invention is directed to the shortcoming of prior art, by years of researches and experiment, and the condition of Optimization Technology, a kind of environment-friendly treating process of new sanitary sewage is provided.
Technical scheme of the present invention is as follows:
The treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Pass into carbon dioxide aeration 5-8min, adjustment PH is 6.5-7.5;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 10-15min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 5-8min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 20-25min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 10-15min;
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
As preferably, described oxidation equalizing tank is catalytic oxidation mechanism.
In reactor, hydraulic detention time to be degraded the impact had clearly for the removal of anaerobism COD.Higher flow velocity can increase the disturbance in reactor, thus it is more abundant that mud is contacted with organic in waste water, is conducive to improving clearance.But the water outlet of high flow rate flows through often carries anaerobic membrane, decreases biofilm biomass in reactor.Lower flow velocity can increase sewage and biomembranous duration of contact, microorganism is absorbed fully, nutritive substance in degradation of sewage, improves processing efficiency; But too low flow velocity also can cause part microorganism cannot obtain sufficient nutrient thing, if can not get sufficient nutrition for a long time, will cause microorganism endogenous respiration thus biofilm detachment.Therefore, in order to obtain good treatment effect, it is vital for choosing suitable hydraulic detention time.
The present invention has surprisingly found to pass into carbonic acid gas period of aeration in the sewage disinfection treatment stage, coordinate and anaerobic biofilter and oxidation equalizing tank are circulated the process optimization of twice process, can obtain good wastewater treatment efficiency, sludge quantity also can not significantly increase and expand.
Usefulness of the present invention is:
1, technique of the present invention effectively can reduce COD, and has good deodorizing effect.
2, technological operation of the present invention is simple, only needs twice anaerobic biofilter and oxidation equalizing tank circular treatment, reduces costs, save time, raise the efficiency.
3, technique of the present invention is carried out for a long time continuously, and sludge bulking is not obvious, and process continuously in four months, swell increment is not higher than 5%.
Embodiment
embodiment 1:
The treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Pass into carbon dioxide aeration 5min, adjustment PH is 6.5-7.5;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 10min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 5min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 20min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 10min;
Described oxidation equalizing tank is catalytic oxidation mechanism.
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
Test period is 4 months, and the mean value of the indices of comprehensive water inlet waste water is respectively: COD568.26mg/L; Ammonia nitrogen 58.67mg/L; BOD598.71mg/L.Effluent index is respectively: COD22.90mg/L; Ammonia nitrogen 1.25mg/L; BOD58.07mg/L.
Continuous operation 4 months sludge bulking amounts are not more than 5%.
embodiment 2:
The treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Pass into carbon dioxide aeration 8min, regulate PH to be 7.5;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 15min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 8min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 25min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 15min;
Described oxidation equalizing tank is catalytic oxidation mechanism.
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
Test period is 4 months, and the mean value of the indices of comprehensive water inlet waste water is respectively: COD651.71mg/L; Ammonia nitrogen 55.16mg/L; BOD588.36mg/L.Effluent index is respectively: COD29.31mg/L; Ammonia nitrogen 1.58mg/L; BOD57.86mg/L.
Continuous operation 4 months sludge bulking amounts are not more than 5%.
embodiment 3:
The treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Pass into carbon dioxide aeration 6min, adjustment PH is 6.5-7.5;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 12min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 6min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 22min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 12min;
Described oxidation equalizing tank is catalytic oxidation mechanism.
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
Test period is 4 months, and the mean value of the indices of comprehensive water inlet waste water is respectively: COD578.67mg/L; Ammonia nitrogen 53.25mg/L; BOD596.91mg/L.Effluent index is respectively: COD19.810mg/L; Ammonia nitrogen 1.52mg/L; BOD56.97mg/L.
Continuous operation 4 months sludge bulking amounts are not more than 5%.
embodiment 4:
The treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Pass into carbon dioxide aeration 7min, adjustment PH is 6.5-7.5;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 14min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 7min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 22min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 12min;
Described oxidation equalizing tank is catalytic oxidation mechanism.
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
Test period is 4 months, and the mean value of the indices of comprehensive water inlet waste water is respectively: COD641.27mg/L; Ammonia nitrogen 55.79mg/L; BOD589.32mg/L.Effluent index is respectively: COD18.79mg/L; Ammonia nitrogen 1.03mg/L; BOD58.73mg/L.
Continuous operation 4 months sludge bulking amounts are not more than 3%.
embodiment 5 comparative example:
The treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Regulate PH, precipitation, but not aeration;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 20min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 10min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 15min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 18min;
Described oxidation equalizing tank is catalytic oxidation mechanism.
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
Test period is 4 months, and the mean value of the indices of comprehensive water inlet waste water is respectively: COD596.35mg/L; Ammonia nitrogen 62.39mg/L; BOD588.65mg/L.Effluent index is respectively: COD121.36mg/L; Ammonia nitrogen 1.53mg/L; BOD518.39mg/L.
Continuous operation 4 months sludge bulking amounts are about 12%.
As can be seen here, technique of the present invention is very outstanding, carries out sewage disinfection treatment, coordinate the Optimization Technology of twice anaerobic biofilter and oxidation equalizing tank circular treatment, can dispose of sewage to energy-conserving and environment-protective, the clearance of COD and BOD5 is all very high, apparently higher than control group.Sludge bulking rate is also remarkable in expansion group.And this technological operation is easy, be worthy to be popularized.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (5)
1. the treatment process of one way of life sewage, it comprises the steps:
(1) sewage is through pre-treatment:
Pass into carbon dioxide aeration 5-8min, adjustment PH is 6.5-7.5;
(2) anaerobic biofilter and oxidation equalizing tank circulate twice process:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, the water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, the water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, the water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 10-15min;
(3) sewage discharge;
Sewage after process is discharged through discharge outlet, and mud reclaims and enters anaerobic biofilter.
2. the treatment process of sanitary sewage according to claim 1, is characterized in that:
Described oxidation equalizing tank is catalytic oxidation mechanism.
3. the treatment process of the sanitary sewage described in claim 1-2, is characterized in that:
The concrete technology of step (2) is:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 10-15min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 5-8min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 20-25min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 10-15min.
4. the treatment process of sanitary sewage according to claim 3, is characterized in that:
The concrete technology of step (2) is:
Pretreated sewage and enter anaerobic biofilter after mixing from the returned sluge of second pond and process, dwell time of sewage is 14min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 7min;
The water outlet of oxidation equalizing tank again enters anaerobic biofilter and again processes, and dwell time of sewage is 22min;
The water outlet of anaerobic biofilter enters the process of oxidation equalizing tank, and dwell time of sewage is 12min.
5. the treatment process of the sanitary sewage described in claim 1-4, is characterized in that:
Process continuously in 4 months, sludge bulking amount is not higher than 5%.
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| CN201510580995.8A CN105174618B (en) | 2015-09-14 | 2015-09-14 | A kind of environment-friendly treating process of sanitary sewage |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645672A (en) * | 2015-12-31 | 2016-06-08 | 安徽省绿巨人环境技术有限公司 | Device and method for treating alkaline wastewater |
| CN107117709A (en) * | 2017-05-19 | 2017-09-01 | 重庆中鼎三正科技有限公司 | A kind of new waste water control method |
| CN107935305A (en) * | 2017-11-28 | 2018-04-20 | 奕铭（大连）科技发展有限公司 | A kind of domestic sewage processing method |
| CN108996834A (en) * | 2018-08-20 | 2018-12-14 | 朱翠帮 | A kind of processing method of sanitary sewage |
| CN109721159A (en) * | 2019-02-25 | 2019-05-07 | 北京工业大学 | Lack the aerobic device and method for alternately realizing synchronous short-cut nitrification and denitrification joint Anammox processing Low-carbon Urban Wastewater |
| CN110981104A (en) * | 2019-12-21 | 2020-04-10 | 潍坊科技学院 | Flocculating agent, preparation method and application thereof, and domestic sewage treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279808A (en) * | 2008-05-28 | 2008-10-08 | 北京大学 | Method for processing nitrobenzene and aniline waste water |
| CN102134143A (en) * | 2011-01-28 | 2011-07-27 | 北京市水利科学研究所 | Method and device for treating sewage in anaerobic bio-filter and solar aeration bio-filter |
| CN102718365A (en) * | 2012-06-28 | 2012-10-10 | 苏州科博思流体科技有限公司 | Buried sewage treatment device |
-
2015
- 2015-09-14 CN CN201510580995.8A patent/CN105174618B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101279808A (en) * | 2008-05-28 | 2008-10-08 | 北京大学 | Method for processing nitrobenzene and aniline waste water |
| CN102134143A (en) * | 2011-01-28 | 2011-07-27 | 北京市水利科学研究所 | Method and device for treating sewage in anaerobic bio-filter and solar aeration bio-filter |
| CN102718365A (en) * | 2012-06-28 | 2012-10-10 | 苏州科博思流体科技有限公司 | Buried sewage treatment device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645672A (en) * | 2015-12-31 | 2016-06-08 | 安徽省绿巨人环境技术有限公司 | Device and method for treating alkaline wastewater |
| CN107117709A (en) * | 2017-05-19 | 2017-09-01 | 重庆中鼎三正科技有限公司 | A kind of new waste water control method |
| CN107935305A (en) * | 2017-11-28 | 2018-04-20 | 奕铭（大连）科技发展有限公司 | A kind of domestic sewage processing method |
| CN108996834A (en) * | 2018-08-20 | 2018-12-14 | 朱翠帮 | A kind of processing method of sanitary sewage |
| CN109721159A (en) * | 2019-02-25 | 2019-05-07 | 北京工业大学 | Lack the aerobic device and method for alternately realizing synchronous short-cut nitrification and denitrification joint Anammox processing Low-carbon Urban Wastewater |
| CN109721159B (en) * | 2019-02-25 | 2021-09-14 | 北京工业大学 | Device and method for treating low-carbon municipal sewage by combining anoxic-aerobic alternate synchronous shortcut nitrification and denitrification with anaerobic ammonia oxidation |
| CN110981104A (en) * | 2019-12-21 | 2020-04-10 | 潍坊科技学院 | Flocculating agent, preparation method and application thereof, and domestic sewage treatment method |
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| CN105174618B (en) | 2018-03-16 |
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Inventor after: Xu Wenjin Inventor after: Xu Hui Inventor after: Ouyang Xiongwu Inventor before: Shen Yinyun Inventor before: Tao Feng |
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Effective date of registration: 20180212 Address after: Wanjiali road 410000 in Hunan province Changsha Kaifu District, a No. 899 Lake court No. 1 building 401 room Applicant after: Hunan Zhongji Environmental Investment Co., Ltd. Address before: Wuxing District of Zhejiang city in Huzhou province 313000 Township temple shijiaqiao Village Applicant before: HUZHOU DAOCHANG SEWAGE TREATMENT CO., LTD. |
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