CN113830885B - Defoaming method for aerobic tank of sewage treatment biochemical system - Google Patents
Defoaming method for aerobic tank of sewage treatment biochemical system Download PDFInfo
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- CN113830885B CN113830885B CN202111251236.9A CN202111251236A CN113830885B CN 113830885 B CN113830885 B CN 113830885B CN 202111251236 A CN202111251236 A CN 202111251236A CN 113830885 B CN113830885 B CN 113830885B
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- defoaming
- guide cylinder
- aerobic tank
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a defoaming method for an aerobic tank of a biochemical system, which comprises the following steps: the jet aeration system provides upward fluid flow and a certain water head height below the liquid level, the defoaming circulating pump rushes high-speed water flow into the guide cylinder through the pipeline, a suction vortex is formed on the water surface, foam is sucked into the guide cylinder and is remixed with activated sludge in the biochemical tank, and the foam is decomposed by the activated sludge in multiple circulation inside and outside the guide cylinder, so that a defoaming effect is realized. The invention decomposes and eliminates from the foam property, has obvious effect, fully utilizes common equipment of a biochemical system, does not need to add defoamer, and reduces the investment and operation cost of the system.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a defoaming method for an aerobic tank of a sewage treatment biochemical system.
Background
The biochemical treatment method is the most widely used treatment method of sewage treatment plants. For most sewage treatment plants adopting biochemical treatment in the world, surface foam problems are common, which cause difficulties in the operation, running and control of the sewage treatment plants and also seriously affect the quality of effluent.
There are two main current defoaming methods, defoaming agent defoaming and physical defoaming. The method for adding the defoaming agent is the most widely applied defoaming method in various industries at present, and has the advantages of greatly improving the defoaming efficiency, being convenient to use and the like, but the searching of a proper and efficient defoaming agent is very critical. At the same time, the use of defoamers throughout the system operation can also result in increased operating costs.
The physical defoaming method mainly comprises mechanical defoaming, filter screen placement or baffle plate addition, freezing, heating, steam, high-speed centrifugation, pressurization and decompression, high-frequency vibration, instant discharge and the like. However, in the process of physical defoaming, environmental factors have a strong restriction on the use of these methods, and if a proper defoaming method is not selected, the defoaming rate is seriously affected.
Disclosure of Invention
In order to overcome the defects of the prior art, improve the defoaming efficiency and reduce the running cost of the system, the invention aims to provide the defoaming method of the sewage treatment biochemical system in the aerobic tank, which does not need to add a defoaming agent or other medicaments into the system and fully utilizes the biochemical system equipment.
The invention adopts the following technical scheme:
an antifoaming method for an aerobic tank of a sewage treatment biochemical system, the antifoaming method comprises the following steps: the jet aeration system provides upward fluid flow and a certain water head height below the liquid level, the defoaming circulating pump flushes high-speed water flow into the guide cylinder through a pipeline, the water surface height difference and the pressure difference formed by the two modes lead the water surface to form a suction vortex, foam is sucked into the guide cylinder to be mixed with activated sludge in the biochemical tank again, and the foam is decomposed by the activated sludge in multiple circulation inside and outside the guide cylinder, so that the defoaming effect is realized.
Further, the defoaming method includes: and the outlet area is reduced at the outlet of the defoaming circulating pump pipeline, so that a faster water outlet flow speed is provided, a higher pressure difference is formed, and the water surface suction vortex forming condition is met.
Further, the defoaming method lifts the position of the jet aerator to 4-5 meters below the liquid level so as to provide sufficient rising flow velocity and water head height outside the guide cylinder.
Furthermore, the defoaming method inserts an air pipe into the defoaming circulating pipe, and carries air into the sewage through high-speed flowing water flow to carry out jet oxygenation, so that the aeration rate of the system is reduced, and the production amount of foam is reduced.
Further, the flow guide cylinder of the defoaming method is fixed on the side wall of the aerobic tank, the length is 4 meters, and the installation position is positioned below the liquid level by 0.5 meter.
Furthermore, the defoaming method needs to be used after the activated sludge has normal capability of decomposing organic matters after the biochemical system is stably debugged.
Furthermore, the method for reducing the outlet area of the defoaming circulation pipe is designed in an inverted circular table mode.
Furthermore, the outlet water flow rate of the defoaming circulation pipe gate needs to reach 10-15 m/s.
Furthermore, the air pipe and the defoaming circulating water pipe should keep a certain concentricity, and the upper part of the air pipe is provided with a control valve, so that the air inflow can be adjusted.
The beneficial effects are that:
the invention has the advantages that the invention does not need to add defoamer or other chemical agents, greatly reduces the running cost of biochemical treatment, fully utilizes biochemical treatment system equipment such as a circulating pump and a jet aerator, only adds a guide cylinder and an air pipe, has low cost, does not need to additionally add a defoaming system, has stable running effect and is convenient to operate.
Drawings
FIG. 1 is a schematic diagram of a defoaming structure used in the defoaming method of an aerobic tank of a sewage treatment biochemical system of the present invention. 1. The circulating pump 2, the air pipe 3, the guide cylinder 4 and the jet aerator.
Detailed Description
According to the invention, upward fluid flow and a certain water head height are provided below the liquid level through the jet aeration system, the defoaming circulating pump flushes high-speed water flow into the guide cylinder through the pipeline, the water surface height difference and the pressure difference formed by the two modes cause the water surface to form a suction vortex, foam is sucked into the guide cylinder and is remixed with activated sludge in the biochemical tank, and the foam is decomposed by the activated sludge in multiple circulation inside and outside the guide cylinder, so that the defoaming effect is realized.
Specifically, the defoaming method for the aerobic tank of the sewage treatment biochemical system specifically comprises the following steps: the defoaming circulating pump pumps circulating sewage into the guide cylinder through the defoaming circulating pipe, when the sewage enters the guide cylinder, the inner surface of the cylinder forms a suction vortex due to high flow velocity, foam on the surface of the sewage enters the inner part of an aerobic pool at the bottom of the guide cylinder along with the vortex to be mixed with activated sludge, then the foam rises to the liquid level under the action of airflow of the jet aerator, and after repeated circulation, the foam is decomposed.
And the outlet area is reduced at the outlet of the defoaming circulating pump pipeline, so that a faster water outlet flow speed is provided, a higher pressure difference is formed, and the water surface suction vortex forming condition is met.
The method for reducing the outlet area of the defoaming circulation pipe is designed into an inverted circular table, and the height of the inverted circular table is 0.25-0.4 m. The outlet water flow rate of the defoaming circulation pipe gate needs to reach 10-15 m/s.
The defoaming method lifts the position of the jet aerator to 4-5 meters below the liquid level so as to provide sufficient rising flow velocity and water head height outside the guide cylinder.
According to the defoaming method, the air pipe is inserted into the defoaming circulating pipe, air is brought into the sewage through high-speed flowing water flow to carry out jet oxygenation, the aeration rate of the system is reduced, and meanwhile, the production amount of foam is reduced.
Specifically, the air pipe and the defoaming circulating water pipe should keep certain concentricity, and the upper part of the air pipe is provided with a control valve, so that the air inflow can be adjusted.
The guide cylinder of the defoaming method is fixed on the side wall of the aerobic tank, the length of the guide cylinder is 4 meters, and the installation position of the guide cylinder is 0.5 meter below the liquid level.
The defoaming method needs to be used after the activated sludge has normal capability of decomposing organic matters after the biochemical system is debugged and stabilized.
Claims (6)
1. The defoaming method for the aerobic tank of the sewage treatment biochemical system is characterized by comprising the following steps of: providing upward fluid flow and a certain water head height below the liquid level by a jet aeration system, flushing high-speed water flow into a guide cylinder by a defoaming circulating pump through a pipeline, forming a suction vortex by the water surface height difference and the pressure difference formed by the two modes, sucking foam into the guide cylinder to be mixed with active sludge in a biochemical pool again, and decomposing the foam by the active sludge in multiple cycles inside and outside the guide cylinder to realize a defoaming effect;
reducing the area of an outlet at the outlet of a defoaming circulating pump pipeline;
the defoaming method is characterized in that the position of a jet aerator is raised to 4-5 meters below the liquid level, so that sufficient rising flow speed and water head height are provided outside a guide cylinder;
according to the defoaming method, the air pipe is inserted into the defoaming circulating pipe, air is brought into the sewage through high-speed flowing water flow to carry out jet oxygenation, the aeration rate of the system is reduced, and meanwhile, the production amount of foam is reduced.
2. The method for defoaming an aerobic tank according to claim 1, wherein the guide cylinder is fixed on the side wall of the aerobic tank, has a length of 4 meters and is arranged at a position 0.5 meter below the liquid surface.
3. The method for defoaming an aerobic tank according to claim 1, wherein the defoaming method is used after the activated sludge has normal capability of decomposing organic matters after the biochemical system is regulated and stabilized.
4. The method for defoaming an aerobic tank according to claim 1, wherein the method for reducing the outlet area of the defoaming circulation pipe is of inverted truncated cone design.
5. The method for defoaming an aerobic tank according to claim 1, wherein the outlet water flow rate of the outlet water of the defoaming circulation pipe is required to be 10-15 m/s.
6. The defoaming method of claim 1, wherein the air pipe has a certain concentricity with the defoaming circulating water pipe, and the upper part of the air pipe is provided with a control valve, so that the air inflow can be adjusted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111251236.9A CN113830885B (en) | 2021-10-27 | 2021-10-27 | Defoaming method for aerobic tank of sewage treatment biochemical system |
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| CN202111251236.9A CN113830885B (en) | 2021-10-27 | 2021-10-27 | Defoaming method for aerobic tank of sewage treatment biochemical system |
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| CN113830885A CN113830885A (en) | 2021-12-24 |
| CN113830885B true CN113830885B (en) | 2023-05-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000005787A (en) * | 1998-06-19 | 2000-01-11 | Japan Steel Works Ltd:The | Anaerobic sewage treating apparatus |
| JP2004243280A (en) * | 2003-02-17 | 2004-09-02 | Kurita Water Ind Ltd | Method and apparatus for aerobic digestion process of sludge |
| JP2006110543A (en) * | 2004-09-17 | 2006-04-27 | Bio Cycle Nogyo Kenkyusho:Kk | Method for treating waste water containing high-concentration organic matter and defoaming apparatus |
| CN101395091A (en) * | 2006-02-02 | 2009-03-25 | 李载宪 | Pure oxygen aeration system for wastewater treatment |
| CN204981319U (en) * | 2015-09-06 | 2016-01-20 | 武汉森泰环保股份有限公司 | Aeration tank efflux fire fighting equipment that breathes in |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002273451A (en) * | 2001-03-23 | 2002-09-24 | Hideo Tanaka | Water purifying device |
| JP3744428B2 (en) * | 2002-01-30 | 2006-02-08 | 栗田工業株式会社 | Apparatus and method for aerobic digestion treatment of sludge |
| CN204485674U (en) * | 2015-01-28 | 2015-07-22 | 韦孟威 | A kind of jet mixing device and the open type anaerobic reactor with this agitating device |
| CN112759189B (en) * | 2020-12-29 | 2021-09-28 | 华夏碧水环保科技有限公司北京分公司 | A fire fighting equipment for sewage biochemical treatment |
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- 2021-10-27 CN CN202111251236.9A patent/CN113830885B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000005787A (en) * | 1998-06-19 | 2000-01-11 | Japan Steel Works Ltd:The | Anaerobic sewage treating apparatus |
| JP2004243280A (en) * | 2003-02-17 | 2004-09-02 | Kurita Water Ind Ltd | Method and apparatus for aerobic digestion process of sludge |
| JP2006110543A (en) * | 2004-09-17 | 2006-04-27 | Bio Cycle Nogyo Kenkyusho:Kk | Method for treating waste water containing high-concentration organic matter and defoaming apparatus |
| CN101395091A (en) * | 2006-02-02 | 2009-03-25 | 李载宪 | Pure oxygen aeration system for wastewater treatment |
| CN204981319U (en) * | 2015-09-06 | 2016-01-20 | 武汉森泰环保股份有限公司 | Aeration tank efflux fire fighting equipment that breathes in |
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| CN113830885A (en) | 2021-12-24 |
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