CN105621603A - Returned sludge elutriation process of biological sewage treatment system - Google Patents
Returned sludge elutriation process of biological sewage treatment system Download PDFInfo
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- CN105621603A CN105621603A CN201610004244.6A CN201610004244A CN105621603A CN 105621603 A CN105621603 A CN 105621603A CN 201610004244 A CN201610004244 A CN 201610004244A CN 105621603 A CN105621603 A CN 105621603A
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Treatment Of Sludge (AREA)
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Abstract
The invention provides a returned sludge elutriation process of a biological sewage treatment system. A sludge return pump conveys a sludge mixture in a secondary sedimentation tank to a hydraulic cyclone separator; under the dynamic action of the sludge return pump, the hydraulic cyclone separator separates impurities such as large-density particles in returned sludge, and the separated low-density sludge mixture enters into a filtration screen through an overflow port in the upper end of the hydraulic cyclone separator; the filtration screen separates out substances such as large granular paper scraps, plant fibers and fur in the sludge mixture, and the screened returned sludge enters into a sludge activation tank so as to be subjected aeration activation treatment; the activated returned sludge enters into an aeration tank, active microbial populations in the returned sludge are increased, so that the sludge load in the aeration tank is improved, and thus the sewage treatment efficiency is improved; during the whole elutriation process, the sludge return pump is needed to lift only one time, facility required for the process can be simplified, the energy consumption can be reduced and the operating expense is reduced.
Description
Technical field
The present invention relates to town sewage treatment system, specifically the elutriation activating process of returned sludge in town sewage active sludge processing system.
Background technology
In town sewage treatment system, sewage is generally after preposition setting pot, preliminary sedimentation tank process, enter hydrolysis acidification or anaerobic treatment, carrying out Aerobic biological process subsequently into Aeration tank, Aerobic biological process mainly has activated sludge process and biomembrance process, and sewage enters second pond after Aeration tank Aerobic biological process, realize muddy water solid-liquid separation, after solid-liquid separation, sewage qualified discharge or carry out advanced treating, mud then enters corresponding subsequent treatment operation.
Activated sludge in activated sludge process Aeration tank mainly includes four parts: 1. have the active microorganism colony of metabolic function, 2. microorganism endogenous respiration, autoxidation residue, 3. the microorganism that raw sewage contains is difficult to the Organic substance degraded, the inorganic matter that 4. raw sewage contains, Aeration tank decomposes the active microorganism colony in organic mainly activated sludge in oxidation sewage with metabolic function. in the Aeration tank of activated sludge process, MLSS is normally controlled within the scope of 2000��4000mg/L, general containing only there being 30��50% active microorganism colonies in activated sludge, in activated sludge process running, because of inorganic matter and organic density contrast in activated sludge, prolongation along with the time of operation, active microorganism population size in Aeration tank activated sludge can be gradually lowered, inorganic constituents is then stepped up, the minimizing of active microorganism colony will affect sewage treatment effeciency in Aeration tank, in certain activated sludge solids gross mass (MLSS) scope, certainly will cause that sludge loading reduces, sewage treating efficiency reduces, under set treatment scale, treatment effect is deteriorated, under set treatment effect, then treatment scale reduces. therefore, by improving the content of the active microorganism colony in Aeration tank, then sewage treatment effect in Aeration tank can be effectively improved.
The partial sludge of second pond is refluxed in Aeration tank, is a kind of mode improving the active microorganism population size in Aeration tank. existing sludge reflux mode is, with sludge reflux pump, mud a certain amount of in second pond is pumped directly into Aeration tank, due in the mud mixture of second pond containing organic/inorganic substance, the fine particle silt that the density that can not remove including setting pot and preliminary sedimentation tank is bigger, the paper scrap that density is less, Plant fiber and hair etc., mud containing these inorganic matters is directly back in Aeration tank, the accumulation of inorganic matter composition in Aeration tank can be aggravated and increase, cause that the content with the active microorganism colony of metabolic function reduces further, thus, more affect sewage treatment effect in Aeration tank.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of sewage biological treatment system returned sludge and eluriates technique, this technique mud to being refluxed by second pond carries out elutriation process, remove the graininess silt that returned sludge Midst density is bigger, the paper scrap that density is less, the material such as Plant fiber and hair, improve the active microorganism population size in returned sludge, and the mud after eluriating is carried out activation processing again, it is then refluxed in Aeration tank, thus the active microorganism colony composition improved in Aeration tank in activated sludge, realize the purpose of sludge loading and the sewage treating efficiency improving Aeration tank.
This sewage biological treatment system returned sludge eluriates the step of technique, referring to Fig. 1:
A, by sludge reflux pump, the mud mixture in second pond in sewage biological treatment system is delivered to hydrocyclone;
B, under the dynamic action of described sludge reflux pump, the impurity such as the bigger graininess silt of returned sludge Midst density are easily separated by hydrocyclone, the foreign material such as the graininess silt after separated are discharged by the underflow opening of hydrocyclone bottom, and the mud mixture containing the materials such as the less paper scrap of density, Plant fiber and hair after separated is entered screen by the overfall of hydrocyclone upper end;
The mud mixture entered is carried out Screening Treatment by c, described screen, density in mud mixture is the less and material such as paper scrap, Plant fiber and hair that granule is bigger is easily separated, the materials such as paper scrap after screening and separating, Plant fiber and hair are discharged by slag notch, and the returned sludge after Screening Treatment enters sludge activation pond;
D, returned sludge carry out aeration activation processing in sludge activation pond;
Returned sludge after e, activation processing enters in the Aeration tank in sewage biological treatment system, and the active microorganism colony in returned sludge participates in the organic pollution that oxidation Decomposition enters in Aeration tank in sewage. Because active microorganism colony increases in mud, the sludge loading in Aeration tank is made to improve, thus improving sewage treating efficiency.
The present invention has following technical effect that
1, present invention process is according to the existing forms of inorganic constituents in returned sludge, carry out eluriating separating treatment through hydrocyclone and screen after elder generation, successively remove the big inorganic particulate matter of density and the little material of density, being effectively improved in returned sludge active microorganism population size, in returned sludge, active microorganism population size can improve 15-20%.
2, to the mud after hydrocyclone separates elutriation process with screen, carry out activation processing again, the active microorganism colony in mud is made to be in the endogenous respiration phase, after being back to Aeration tank, it is typically in the micropopulation high adsorption capacity of endogenous respiration phase, and adsorbing is that micropopulation decomposes the organic first step in oxidation sewage, therefore, micropopulation after activated can significantly improve it to absorption organic in sewage and oxidation susceptibility, thus improving the wastewater treatment efficiency of Aeration tank. Adopting the returned sludge through eluriating and after activation, in Aeration tank, the clearance of dirty organic pollutants can improve 15��20%.
3, owing to the hydrocyclone in this technique is arranged at the front end of system, the power that sludge reflux pump provides not only can meet the work of hydrocyclone and run, and the mud mixture containing the less inorganic matter of density after separating can be sent into screen, enter in the process of screen without additionally arranging delivery pump at mud, whole elutriation process has only to the disposable lifting of sludge reflux pump, simplify the facility needed for technique, energy consumption and operating cost can be reduced.
4, owing to returned sludge makes the increase of active microorganism population size in activated sludge in Aeration tank, after the Aeration tank sewage sludge mixture follow-up second pond of entrance carries out precipitate and separate, content of organics in mud is made in second pond to increase therewith, then be conducive to follow-up excess sludge Anaerobic Digestion process stabilization to run continuously, and increase the yield of anaerobic digestion biogas.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart, and as Figure of abstract;
Fig. 2 is the related device structural representation realizing this technique.
Detailed description of the invention
By sludge reflux pump 1, the mud mixture in second pond in sewage biological treatment system 3 is delivered to hydrocyclone 5; The entrance of sludge reflux pump 1 is connected with the sludge blanket of second pond 3 bottom by the first dredging tube 2, and the outlet of sludge reflux pump 1 is by the inlet communication of the second dredging tube 4 with hydrocyclone 5.
Under the dynamic action of described sludge reflux pump 1, returned sludge enters in this hydrocyclone from the tangential feed pipe on hydrocyclone top, and in cylindrical cavity, produce high speed rotating flow field, namely the foreign material such as the bigger fine particle silt of returned sludge Midst density are easily separated by hydrocyclone 5, thus realizing the separation of particles of inorganic material, the foreign material such as the particles of inorganic material shape after separated are discharged by the underflow opening of hydrocyclone bottom, the paper scrap less containing density after separated, the mud mixture such as Plant fiber and hair, continue under the dynamic action of sludge reflux pump 1, screen 7 is entered by the overfall of hydrocyclone upper end, the overfall of hydrocyclone 5 upper end is communicated with the import of screen 7 by the 3rd dredging tube 6, referring to Fig. 2, the mud foreign material such as the particles of inorganic material shape of hydrocyclone lower bottom head piece discharge is processed by the facility additionally arranged. entering in the process of screen 7 without additionally arranging delivery pump by hydrocyclone 5 upper end overfall at returned sludge, whole elutriation process has only to the disposable lifting of sludge reflux pump, simplifies the facility needed for technique, can reduce energy consumption and operating cost.
The mud mixture entered is carried out Screening Treatment by screen 7, the materials such as the bigger paper scrap of the granule in mud mixture, Plant fiber and hair are easily separated, the materials such as paper scrap, Plant fiber and hair that granule after screening and separating is bigger are discharged by slag notch, and the returned sludge after Screening Treatment enters in sludge activation pond 9 by the 4th dredging tube 8; Screen 7 is containing storage mud groove 7a, and the mud after Screening Treatment enters sludge activation pond 9 by described 4th dredging tube 8 after falling into storage mud groove 7a; Described screen 7 preferably rotates rotary screen; The material otherwise processed such as the bigger paper scrap of granule, Plant fiber and the hair got rid of by screen 7 slag notch.
Carrying out after elutriation separating treatment through hydrocyclone and screen, the active microorganism population size in returned sludge can improve 15-20%.
Returned sludge enters in sludge activation pond 9 and carries out aeration activation processing, the microorganism in mud is made to be in the endogenous respiration phase, the microorganism adsorption ability being in the endogenous respiration phase is strong, aeration intensity is controlled by oxidation-reduction potential (ORP), arranging aeration tube 9a in sludge activation pond, aeration tube 9a is supplied by compressed air source unit; Aeration in activating tank, it is provide oxygen to active microorganism colony, because in activating tank, substrate (Organic substance) concentration is very low, micropopulation relies on endogenous metabolism, utilize the plasmic oxidations of part such as the reserve substance of self, enzyme, obtaining nutrient substance, Ze Shi active microorganism colony is in " hunger " state. Sludge activation pond 9 is connected with the Aeration tank 11 in sewage biological treatment system by the 5th dredging tube 10.
Returned sludge after activation processing enters the Aeration tank 11 in sewage biological treatment system, and the active microorganism colony in returned sludge participates in the organic pollution that oxidation Decomposition enters in Aeration tank in sewage. Because active microorganism colony increases in mud, the sludge loading in Aeration tank is made to improve, thus improving sewage treating efficiency. Aeration component 11a in Aeration tank 11 carries out in the process of aeration, and in Aeration tank, the clearance of the organic pollution in sewage can improve 15��20%.
This technique mud to being refluxed by second pond, successively carry out elutriation process through hydrocyclone and screen, activation processing is carried out then through sludge activation pond, it is then refluxed in Aeration tank, the sludge loading in Aeration tank and the active microorganism colony composition in activated sludge can be improved, thus the sewage treating efficiency improved in Aeration tank, existing sewage treatment plant upgrading capacity expansion revamping can be realized, meet one of technological approaches that the wastewater treatment effluent quality of country's increasingly stringent requires, be also the alternative reduced investment outlay of newly-built sewage treatment plant.
Claims (3)
1. sewage biological treatment system returned sludge eluriates technique, it is characterized in that:
A, by sludge reflux pump, the mud mixture in second pond in sewage biological treatment system is delivered to hydrocyclone;
B, under the dynamic action of described sludge reflux pump, the impurity such as the bigger graininess silt of returned sludge Midst density are easily separated by hydrocyclone, the foreign material such as the graininess silt after separated are discharged by the underflow opening of hydrocyclone bottom, and the mud mixture containing the materials such as the less paper scrap of density, Plant fiber and hair after separated is entered screen by the overfall of hydrocyclone upper end;
The mud mixture entered is carried out Screening Treatment by c, described screen, density in mud mixture is the less and material such as paper scrap, Plant fiber and hair that granule is bigger is easily separated, the materials such as paper scrap after screening and separating, Plant fiber and hair are discharged by slag notch, and the returned sludge after Screening Treatment enters sludge activation pond;
D, returned sludge carry out aeration activation processing in sludge activation pond;
Returned sludge after e, activation processing enters in the Aeration tank in sewage biological treatment system, and the active microorganism colony in returned sludge participates in the organic pollution that oxidation Decomposition enters in Aeration tank in sewage.
2. the sewage biological treatment system returned sludge described in claim 1 eluriates technique, it is characterized in that: be provided with aeration tube (9a) in described sludge activation pond (9).
3. the sewage biological treatment system returned sludge described in claim 1 eluriates technique, it is characterized in that: described screen (7) is for rotating rotary screen.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200434A (en) * | 2017-06-12 | 2017-09-26 | 河北卓润环境科技有限公司 | Method based on multidimensional Strong oxdiative and circulation biochemical treatment electroplating wastewater |
| CN107216002A (en) * | 2017-06-12 | 2017-09-29 | 河北卓润环境科技有限公司 | The method that waste water is produced based on multidimensional Strong oxdiative and circulation biochemical treatment coal chemical industry |
| CN107216001A (en) * | 2017-06-12 | 2017-09-29 | 河北卓润环境科技有限公司 | Method based on multidimensional Strong oxdiative and circulation biochemical treatment pulp black liquor middle-stage wastewater |
| CN107235599A (en) * | 2017-06-12 | 2017-10-10 | 河北卓润环境科技有限公司 | The method that waste water is produced based on Strong oxdiative and the thin miscellaneous skin of multiple stage circulation biochemical treatment |
| CN107265757A (en) * | 2017-06-12 | 2017-10-20 | 河北卓润环境科技有限公司 | Method based on Strong oxdiative and circulation biochemical treatment medical intermediate production waste water |
| CN107365012A (en) * | 2017-06-12 | 2017-11-21 | 河北卓润环境科技有限公司 | Method based on multidimensional Strong oxdiative and circulation biochemical treatment refuse leachate |
| CN107381931A (en) * | 2017-06-12 | 2017-11-24 | 河北卓润环境科技有限公司 | Method based on Strong oxdiative and circulation biochemical treatment dyestuff intermediate production waste water |
| CN108083592A (en) * | 2018-01-03 | 2018-05-29 | 辽宁宸远能源环保设备有限公司 | Municipal sludge is innoxious, recycling pretreatment unit and sludge synthesis locate method in advance |
| CN111204944A (en) * | 2020-01-20 | 2020-05-29 | 南京市市政设计研究院有限责任公司 | Sludge culture system and process thereof |
| WO2022011847A1 (en) * | 2020-07-13 | 2022-01-20 | 南京大学 | Method and device for removing organic micro-pollutants in water |
| CN114426372A (en) * | 2020-10-10 | 2022-05-03 | 中国石油化工股份有限公司 | Method and device for improving activity of AO process sludge |
| CN114477668A (en) * | 2021-12-16 | 2022-05-13 | 廖文歆 | Aeration tank return sludge treatment device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107381931A (en) * | 2017-06-12 | 2017-11-24 | 河北卓润环境科技有限公司 | Method based on Strong oxdiative and circulation biochemical treatment dyestuff intermediate production waste water |
| CN107200434A (en) * | 2017-06-12 | 2017-09-26 | 河北卓润环境科技有限公司 | Method based on multidimensional Strong oxdiative and circulation biochemical treatment electroplating wastewater |
| CN107216001A (en) * | 2017-06-12 | 2017-09-29 | 河北卓润环境科技有限公司 | Method based on multidimensional Strong oxdiative and circulation biochemical treatment pulp black liquor middle-stage wastewater |
| CN107235599A (en) * | 2017-06-12 | 2017-10-10 | 河北卓润环境科技有限公司 | The method that waste water is produced based on Strong oxdiative and the thin miscellaneous skin of multiple stage circulation biochemical treatment |
| CN107265757A (en) * | 2017-06-12 | 2017-10-20 | 河北卓润环境科技有限公司 | Method based on Strong oxdiative and circulation biochemical treatment medical intermediate production waste water |
| CN107365012A (en) * | 2017-06-12 | 2017-11-21 | 河北卓润环境科技有限公司 | Method based on multidimensional Strong oxdiative and circulation biochemical treatment refuse leachate |
| CN107216002A (en) * | 2017-06-12 | 2017-09-29 | 河北卓润环境科技有限公司 | The method that waste water is produced based on multidimensional Strong oxdiative and circulation biochemical treatment coal chemical industry |
| CN108083592A (en) * | 2018-01-03 | 2018-05-29 | 辽宁宸远能源环保设备有限公司 | Municipal sludge is innoxious, recycling pretreatment unit and sludge synthesis locate method in advance |
| CN111204944B (en) * | 2020-01-20 | 2022-02-01 | 南京市市政设计研究院有限责任公司 | Sludge culture system and process thereof |
| CN111204944A (en) * | 2020-01-20 | 2020-05-29 | 南京市市政设计研究院有限责任公司 | Sludge culture system and process thereof |
| WO2022011847A1 (en) * | 2020-07-13 | 2022-01-20 | 南京大学 | Method and device for removing organic micro-pollutants in water |
| CN114426372A (en) * | 2020-10-10 | 2022-05-03 | 中国石油化工股份有限公司 | Method and device for improving activity of AO process sludge |
| CN114426372B (en) * | 2020-10-10 | 2022-11-11 | 中国石油化工股份有限公司 | Method and device for improving activity of AO process sludge |
| CN114477668A (en) * | 2021-12-16 | 2022-05-13 | 廖文歆 | Aeration tank return sludge treatment device |
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