CN102502951A - Auxiliary sludge discharging method and device for aeration basin in oxidation ditch process - Google Patents
Auxiliary sludge discharging method and device for aeration basin in oxidation ditch process Download PDFInfo
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- CN102502951A CN102502951A CN201110343889XA CN201110343889A CN102502951A CN 102502951 A CN102502951 A CN 102502951A CN 201110343889X A CN201110343889X A CN 201110343889XA CN 201110343889 A CN201110343889 A CN 201110343889A CN 102502951 A CN102502951 A CN 102502951A
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- oxidation ditch
- aeration basin
- sludge discharging
- aeration tank
- discharging device
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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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- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention discloses an auxiliary sludge discharging method and an auxiliary sludge discharging device for an aeration basin in an oxidation ditch process, and relates to the field of sewage treatment. In the conventional oxidation ditch process, active sludge is discharged by a mode of surface overflowing of the aeration basin, the problem that inorganic sludge with high density cannot be discharged out of the aeration basin exists, the sludge is accumulated at the bottom of the aeration basin after long-time running, and the capacity of the aeration basin becomes small, so the removal effect of a sewage treatment plant is reduced. The auxiliary sludge discharging device for the aeration basin in the oxidation ditch process consists of a sludge discharging pipe (1), a valve (2) and a water outlet tank (3); the auxiliary sludge discharging device for the aeration basin is arranged on a basin wall of the lower part of a water outlet weir (5) of an oxidation ditch aeration basin (4); one end of the sludge discharging pipe (1) is connected with the water outlet tank (3), and the other end of the sludge discharging pipe (1) is connected with a part which is 0.1 to 0.3 m far away from the bottom of the aeration basin (4); and the valve (2) is arranged on the sludge discharging pipe (1). After the auxiliary sludge discharging device for the aeration basin in the oxidation ditch process is arranged, the average mass concentration of residual sludge of an oxidation ditch is improved by 5 to 10 percent, and the mass concentration of inorganic matter is improved by 15 to 20 percent.
Description
Technical field
The present invention is auxiliary spoil disposal method in a kind of oxidation ditch process aeration tank and device, and what relate to is sewage disposal technology, especially the auxiliary spoil disposal technology in oxidation ditch process aeration tank.
Background technology
Oxidation ditch (oxidation ditch) has another name called continuous circulated aeration tank (Continuous loop reactor), is a kind of technology of activated sludge process.Oxidation ditch is applied to Holland at first, has become a kind of important sewage disposal technology in Europe, Oceania, South Africa and NA at present.In recent years, adopt the speed of oxidation ditch treatment plant that progress has faster been arranged.The growth in sewage work's quantity of China's oxidation ditch process at present is rapider, all is widely used in provinces and cities such as China Hunan Province, Jiangxi Province, Henan, Anhui, Chongqing.
Oxidation ditch has special hydromechanics fluidised form, and the characteristics of existing complete mixing reactor resist to come the influence of water slug load big, the advantage that effluent quality is good; The characteristics that plug flow reactor is arranged again have certain substrate and DO gradient, and the utilization ratio of oxygen is higher.The oxidation ditch section is a rectangle or trapezoidal, and it is oval mostly planeform is, the depth of water is generally 3～6m in the ditch, and current V-bar is 0.3m/s in the ditch.Oxidation ditch aeration and mixing has inversed umbrella type surface aeration machine, aeration rotary brush or rotating disk etc., and what be used in recent years also has pusher under water.
Oxidation ditch process is stable because of it, convenient operating maintenance, and effluent quality is good.Improved in recent years oxidation ditch process has preferably, and the denitrogenation dephosphorizing ability makes this technology become one of the most practical technology both at home and abroad.
The municipal sewage plant of design has mostly saved preliminary sedimentation tank in recent years, causes a large amount of inorganic particulate matters to get into the aeration tank; The sewage work's settling pit desanding effect that has is not good; Cause the part sand to flow in the oxidation ditch aeration pond with water inlet; And the employing of the aeration tank of oxidation ditch process circulates and the overflow weir draining, and the flow velocity in the oxidation ditch often only has 0.3m/s, and such impellent only can make active sludge be in suspended state; And the big inorganic particulate matter of density is difficult to from the oxidation ditch overflow weir discharge the oxidation ditch aeration pond; The long-time running meeting causes the inorganic mud of part to comprise sand bottom deposit in the aeration tank, reduces the oxidation ditch aeration pool volume, influences the treatment effect of oxidation ditch process.
Summary of the invention
Present oxidation ditch process all adopts the drainage pattern draining of aeration tank surface overflow; Long-time running causes mud in the bottom deposit of oxidation ditch aeration pond; Inorganic mud is difficult to discharge from the aeration tank, causes oxidation ditch aeration pond useful volume to reduce, and influences the treatment effect of sewage work.The present invention solves to get into inorganic mud in the existing oxidation ditch process aeration tank and be difficult to discharge the problem in pond, thereby invents auxiliary spoil disposal technology in a kind of oxidation ditch process aeration tank and device.
For realizing above-mentioned purpose; Above-mentioned technical problem of the present invention mainly is able to solve through following technical scheme: mud discharging device is assisted in described oxidation ditch process aeration tank; By shore pipe; Valve, effluent trough are formed, and the auxiliary mud discharging device in aeration tank is installed on the pool wall of effluent weir bottom in oxidation ditch aeration pond;
Effluent trough links to each other with effluent weir, and effluent trough is located at the outer wall of effluent weir; One end of described shore pipe links to each other with effluent trough, and the shore pipe the other end is connected apart from 0.1m～0.3m place, bottom, aeration tank, on shore pipe, is provided with valve.
When the ratio of the mass concentration MLVSS of active sludge intermixture VSS and mixed liquor suspended solid, MLSS mass concentration MLSS is lower than 50%, Open valve; Valve-off when active sludge MLVSS/MLSS is higher than 70%.
The beneficial effect of the invention
The present invention is through the aeration tank pool wall is provided with auxiliary mud discharging device at oxidation ditch overflow weir place; The higher mud of the big inorganic content of bottom, aeration tank density is discharged the oxidation ditch aeration pond; After setting up the auxiliary mud discharging device in described oxidation ditch process aeration tank; Oxidation ditch excess sludge average quality concentration improves 5～10%, and inorganics quality concentration improves 15～20%.Preventing effectively that inorganic mud from depositing in the aeration tank causes the aeration tank volume to reduce, and influences wastewater treatment efficiency.
Description of drawings
The device synoptic diagram that Fig. 1 adopts for the auxiliary spoil disposal technology in oxidation ditch process aeration tank;
Among the figure: 1-shore pipe, 2-valve, 3-effluent trough, 4-oxidation ditch aeration pond, 5-overflow weir
Embodiment:
Mud discharging device is assisted in described oxidation ditch process aeration tank, and by shore pipe 1, valve 2, effluent trough 3 formed, and the auxiliary mud discharging device in aeration tank is installed on the pool wall of effluent weir 5 bottoms in oxidation ditch aeration pond 4;
Hefei sewage work adopts oxidation ditch process, aeration tank available depth 4.5m, and along with the prolongation of working time, oxidation ditch mud mud substrate concentration is brought up to more than 60% by 40%, and bottom active sludge inorganics ratio is higher.Therefore the amount reduction of effective microbe in the active sludge in the oxidation ditch, inorganic silt lodging is arranged at the bottom, aeration tank simultaneously, and oxidation ditch aeration pond useful volume reduces, and processing cost increases.
Through the oxidation ditch aeration pond is transformed, increase auxiliary mud discharging device at the effluent weir place.
Below effluent trough, set up shore pipe, an end of shore pipe links to each other with effluent trough, and the shore pipe the other end is connected apart from 0.2m place, bottom, aeration tank, on shore pipe, is provided with valve.The flow of shore pipe is 20% of an oxidation ditch water flow.When MLVSS/MLSS is lower than 50%, Open valve; Valve-off when active sludge MLVSS/MLSS is higher than 70%.
In this way, the inorganic mud of oxidation ditch bottom remains spoil disposal through daily row and discharges oxidation ditch system, in the oxidation ditch in the mud organic concentration be improved, MLVSS/MLSS remains on 50～70%.Guarantee oxidation ditch system normal handling effect, also avoided the deposition of silt in the aeration tank.
Claims (3)
1. mud discharging device is assisted in an oxidation ditch process aeration tank, it is characterized in that:
Mud discharging device is assisted in described oxidation ditch process aeration tank, and by shore pipe (1), valve (2), effluent trough (3) are formed, and the auxiliary mud discharging device in aeration tank is installed on the pool wall of effluent weir (5) bottom of oxidation ditch aeration pond (4);
Effluent trough (3) links to each other with effluent weir (5), and effluent trough (3) is located at the outer wall of effluent weir (5); One end of described shore pipe (1) links to each other with effluent trough (3), and shore pipe (1) the other end is connected apart from 0.1m～0.3m place, aeration tank (4) bottom, on shore pipe (1), is provided with valve (2).
2. mud discharging device is assisted in a kind of oxidation ditch process according to claim 1 aeration tank, and it is characterized in that: the design discharge of described shore pipe (1) is 15～30% of an oxidation ditch water flow.
3. use the method for the auxiliary mud discharging device in a kind of oxidation ditch process as claimed in claim 1 aeration tank, it is characterized in that:
When the ratio of the mass concentration MLVSS of active sludge intermixture VSS and mixed liquor suspended solid, MLSS mass concentration MLSS is lower than 50%, Open valve (2); Valve-off when active sludge MLVSS/MLSS is higher than 70% (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110343889XA CN102502951A (en) | 2011-11-03 | 2011-11-03 | Auxiliary sludge discharging method and device for aeration basin in oxidation ditch process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110343889XA CN102502951A (en) | 2011-11-03 | 2011-11-03 | Auxiliary sludge discharging method and device for aeration basin in oxidation ditch process |
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| CN102502951A true CN102502951A (en) | 2012-06-20 |
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| CN201110343889XA Pending CN102502951A (en) | 2011-11-03 | 2011-11-03 | Auxiliary sludge discharging method and device for aeration basin in oxidation ditch process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1277156A (en) * | 2000-08-08 | 2000-12-20 | 杨传芳 | Oxygen dissolving process and equipment for sewage treatment |
| JP3383541B2 (en) * | 1997-01-29 | 2003-03-04 | 株式会社荏原製作所 | Biological treatment method and apparatus for organic wastewater |
| CN201128701Y (en) * | 2008-04-03 | 2008-10-08 | 贵州省环境科学研究设计院 | Mud-water separator for integrated oxidation ditch |
| CN202297245U (en) * | 2011-11-03 | 2012-07-04 | 安徽国祯环保节能科技股份有限公司 | Assistant sludge discharge device for oxidation ditch process aeration tank |
-
2011
- 2011-11-03 CN CN201110343889XA patent/CN102502951A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3383541B2 (en) * | 1997-01-29 | 2003-03-04 | 株式会社荏原製作所 | Biological treatment method and apparatus for organic wastewater |
| CN1277156A (en) * | 2000-08-08 | 2000-12-20 | 杨传芳 | Oxygen dissolving process and equipment for sewage treatment |
| CN201128701Y (en) * | 2008-04-03 | 2008-10-08 | 贵州省环境科学研究设计院 | Mud-water separator for integrated oxidation ditch |
| CN202297245U (en) * | 2011-11-03 | 2012-07-04 | 安徽国祯环保节能科技股份有限公司 | Assistant sludge discharge device for oxidation ditch process aeration tank |
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Application publication date: 20120620 |