CN112807759A - Uniform sludge discharge system for secondary sedimentation tank of sewage treatment plant and control method thereof - Google Patents
Uniform sludge discharge system for secondary sedimentation tank of sewage treatment plant and control method thereof Download PDFInfo
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- CN112807759A CN112807759A CN202011582029.7A CN202011582029A CN112807759A CN 112807759 A CN112807759 A CN 112807759A CN 202011582029 A CN202011582029 A CN 202011582029A CN 112807759 A CN112807759 A CN 112807759A
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- sludge discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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Abstract
The invention discloses a secondary sedimentation tank uniform sludge discharge system of a sewage treatment plant and a control method thereof, wherein the sludge discharge system comprises a sludge return tank and at least two secondary sedimentation tanks, each secondary sedimentation tank is connected with the sludge return tank through a sludge discharge pipe, and a return pump is arranged in the sludge return tank; the mud discharging pipe comprises a mud discharging main pipe and at least two groups of mud discharging branch pipes connected with the mud discharging main pipe, and the mud discharging branch pipes are provided with flow limiting valves and control valves. According to the invention, the flow limiting valves are arranged, so that the flow rates of different secondary sedimentation tanks entering the sludge return tank through the sludge discharge pipe are the same, and the sludge discharge is uniform; through setting up several row mud branch pipe, restriction valve and control valve, can be according to mud reflux ratio requirement nimble adjustment mud reflux ratio and backward flow volume. The invention solves the problem of uneven sludge discharge among the secondary sedimentation tanks of the sewage treatment plant due to different secondary sedimentation tank construction precision and sludge discharge pipe hydraulic loss, and improves the sedimentation effect and the return sludge amount of the secondary sedimentation tank.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a secondary sedimentation tank uniform sludge discharge system of a sewage treatment plant and a control method thereof.
Background
The secondary sedimentation tank is an important component of an activated sludge water treatment system adopted by a sewage plant. The device has the functions of generating clean effluent through mud-water separation and providing concentrated and returned activated sludge, and the working effect of the device directly influences the effluent quality and the returned sludge concentration of the secondary sedimentation tank. Because the treatment structures of the municipal sewage treatment plant are required to be designed in parallel, the number of secondary sedimentation tanks in the sewage treatment plant is generally not less than 2.
In the actual process, a sewage plant is generally provided with only one sludge return tank, and sludge discharge systems of all secondary sedimentation tanks are directly communicated with the sludge return tank through respective sludge discharge pipes so as to share one set of sludge return facility. However, this method is very likely to cause the problem of uneven sludge discharge between different secondary sedimentation tanks, mainly for the following two reasons:
(1) in order to ensure the effluent effect of the secondary sedimentation tank, the specification requires that the load of an effluent weir of the sedimentation tank is required to be lower than a certain limit value. As the design scale of the urban sewage plant is generally over ten thousand tons, the length of the effluent weir is mostly hundreds of meters, and the installation precision of the effluent weir is difficult to ensure in the actual construction process, so that the water heads on the effluent weir between different secondary sedimentation tanks have certain deviation, and the effluent water volumes of the secondary sedimentation tanks are different;
(2) due to the fact that the sewage plant needs to be arranged on the plane and the actual construction precision of the sludge discharge pipe is not enough, the hydraulic losses of the sludge discharge pipe between different secondary sedimentation tanks and a sludge backflow tank have large differences.
Based on two different main reasons of two heavy pond construction precision and mud pipe hydraulic loss, the most municipal sewage treatment plant all has the inhomogeneous problem of mud discharging each other between the two heavy ponds in reality, has both influenced backward flow mud concentration, has reduced the precipitation effect in two heavy ponds again.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide an even sludge discharge system for secondary sedimentation tanks of a sewage treatment plant and a control method thereof, which solve the problem of uneven sludge discharge among the secondary sedimentation tanks due to different secondary sedimentation tank construction precision and different hydraulic losses of sludge discharge pipes among a plurality of secondary sedimentation tanks of the sewage treatment plant, and improve the sedimentation effect and the return sludge amount of the secondary sedimentation tanks.
In order to achieve the purpose, the invention adopts the technical scheme that:
a uniform sludge discharge system of a secondary sedimentation tank of a sewage treatment plant comprises a sludge backflow tank and at least two secondary sedimentation tanks, wherein each secondary sedimentation tank is connected with the sludge backflow tank through a sludge discharge pipe, and a backflow pump is installed in each sludge backflow tank; the sludge discharge pipe comprises a sludge discharge main pipe and at least two groups of sludge discharge branch pipes connected with the sludge discharge main pipe, and the sludge discharge branch pipes are connected in parallel; the mud discharging branch pipe is provided with a flow limiting valve and a control valve; the operating liquid level of the sludge reflux pool is not higher than the height of a valve port of the flow limiting valve; the installation height of the flow limiting valve is lower than the water level of the secondary sedimentation tank. Preferably, the installation height of the flow limiting valve is 1.5-2.5 m lower than the water level of the secondary sedimentation tank.
As a preferred technical scheme, the control valve is positioned between the sludge return tank and the flow limiting valve; the flow limiting valve and the control valve are arranged in the valve well, so that the installation, the operation and the maintenance are convenient.
As a preferred technical scheme, a liquid level meter is installed in the sludge backflow tank and used for being linked with a backflow pump so as to control the liquid level in the sludge backflow tank to be not higher than the height of a valve port of the flow limiting valve and the requirement of the lowest liquid level.
The invention also discloses a control method of the secondary sedimentation tank uniform sludge discharge system of the sewage treatment plant, which comprises the following steps:
(1) according to the design water quantity and the water quality of a sewage plant or the running water quantity and the actual water quality, the maximum values of the reflux quantity and the sludge reflux ratio in the design or operation process are determined in advance, and the grade is divided according to the common data section;
(2) designing the number of the sludge discharge branch pipes, the control valves and the flow limiting valves and the overflowing parameters of the flow limiting valves according to the determined reflux amount and the sludge reflux ratio, so that the combination use of different flow limiting valves can meet the grade of each common data of the sludge reflux ratio;
(3) and during operation, according to the set numerical value of the sludge reflux ratio, the reflux pump and the control valve are linked to meet the sludge reflux ratio and reflux quantity required by the system at different periods.
As a preferred technical scheme, the total overflowing parameters of the flow limiting valves on the sludge discharge branch pipes are set consistently.
It should be noted that the control valve and the flow-limiting valve are all commercially available products, and the specific operation principle thereof will not be described herein.
The invention has the beneficial effects that:
according to the invention, the flow limiting valve is arranged on the sludge discharge pipe between the secondary sedimentation tank and the sludge return tank, so that the flow rates of different secondary sedimentation tanks entering the sludge return tank through the sludge discharge pipe are the same, and the sludge discharge is uniform; through separately setting up several mud branch pipes on the mud drainage main pipe to install restriction valve and control valve on mud drainage branch pipe, through mud drainage branch pipe, restriction valve, control valve's cooperative action, can require nimble adjustment mud reflux ratio and reflux according to mud reflux ratio. The invention solves the problem of uneven sludge discharge among the secondary sedimentation tanks of the sewage treatment plant due to different secondary sedimentation tank construction precision and sludge discharge pipe hydraulic loss, and improves the sedimentation effect and the return sludge amount of the secondary sedimentation tank.
Drawings
FIG. 1 is a schematic structural diagram of a secondary sedimentation tank uniform sludge discharge system of a sewage treatment plant provided by the invention;
description of the drawings: 1-a secondary sedimentation tank; 2-a sludge reflux pool; 3-a reflux pump; 4-a mud discharging main pipe; 5-discharging mud branch pipes; 6-a flow limiting valve; 7-a control valve; 8-valve well; 9-liquid level meter.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a secondary sedimentation tank uniform sludge discharge system of a sewage treatment plant comprises a sludge return tank 2 and at least two secondary sedimentation tanks 1, wherein each secondary sedimentation tank 1 is connected with the sludge return tank 2 through a sludge discharge pipe, and a return pump 3 is installed in the sludge return tank 2; the sludge discharge pipe comprises a sludge discharge main pipe 4 and at least two groups of sludge discharge branch pipes 5 connected with the sludge discharge main pipe 4. In fig. 1, two secondary sedimentation tanks 1 and three groups of sludge discharge branch pipes 5 are taken as an example, and a flow limiting valve 6 and a control valve 7 are arranged on the sludge discharge branch pipes 5. Further, the control valve 7 is positioned between the sludge return tank 2 and the flow limiting valve 6, and the flow limiting valve 6 and the control valve 7 are arranged in the valve well 8 so as to facilitate installation, operation and maintenance. A liquid level meter 9 is installed in the sludge backflow pool 2, and the liquid level meter 9 is used for being linked with the backflow pump 3 so as to control the liquid level in the sludge backflow pool 2 to be not higher than the height of a valve port of the flow limiting valve 6 and the minimum liquid level requirement.
The control valve 7 is in linkage control with the reflux pump 3; the installation height of the flow limiting valve 6 is 1.5-2 m lower than the water level of the secondary sedimentation tank 1; the hydrostatic pressure sludge discharge head of the secondary sedimentation tank 1 is not less than 0.9-1.2 m, the water head required by the flow limiting valve 6 to reach the flow limiting condition is about 0.5m generally, and therefore the installation height condition of the flow limiting valve 6 of 1.5-2 m can meet the actual sludge discharge overflowing requirement of the secondary sedimentation tank 1.
The operating liquid level of the sludge reflux pool 2 is not higher than the valve port height of the flow limiting valve 6, so that the flow limiting valve 6 can always operate under the condition of flow limitation, and the flow of the two secondary sedimentation pools 1 passing through the sludge discharge main pipe 4 is always consistent. The total overflowing parameters of the flow limiting valve 6 between each secondary sedimentation tank 1 and the sludge return tank 2 are set to be consistent in advance, so that the flow of the two secondary sedimentation tanks 1 entering the sludge return tank 2 through the sludge discharge main pipe 4 is the same, the sludge discharge of the two secondary sedimentation tanks 1 is uniform, and the problem of nonuniform mutual sludge discharge between the two sedimentation tanks due to the fact that the construction precision of the secondary sedimentation tanks and the hydraulic loss of the sludge discharge pipes are different between the two secondary sedimentation tanks of the traditional sewage treatment plant is solved.
In the uniform sludge discharge system of the secondary sedimentation tank of the sewage treatment plant, provided by the invention, the sludge discharge branch pipes 5 are respectively provided with the flow limiting valve 6 and the control valve 7, the sludge reflux ratio and the reflux quantity can be flexibly adjusted according to requirements, and the method comprises the following steps: (1) according to the design water quantity and the water quality of a sewage plant or the running water quantity and the actual water quality, the maximum values of the reflux quantity and the sludge reflux ratio in the design or operation process are determined in advance, and the grade is divided according to the common data section; (2) the number of the sludge discharge branch pipes 5, the control valves 7 and the flow limiting valves 6 and the overflowing parameters of the flow limiting valves 6 are designed according to the determined reflux amount and the determined sludge reflux ratio, so that the combination use of different flow limiting valves 6 can meet the grade of each common data of the sludge reflux ratio; (3) and the reflux pump 3 and the control valve 7 are linked during operation according to the set numerical value of the sludge reflux ratio so as to meet the sludge reflux ratio and reflux quantity required by the system at different periods.
Each secondary sedimentation tank 1 is provided with three sludge discharge branch pipes 5, a flow limiting valve 6 and a control valve 7, and the overflowing parameters of the flow limiting valve 6 are preset to be 0.3, 0.1 and 0.1 times of the designed water quantity of a sewage plant respectively. By opening the number of the control valves 7, the sludge discharge amount of each secondary sedimentation tank 1 can be three levels of 0.3, 0.4 and 0.5 times of the designed water amount, and the sludge reflux ratio can respectively reach 60 percent, 80 percent and 100 percent.
Claims (7)
1. A uniform sludge discharge system of a secondary sedimentation tank of a sewage treatment plant comprises a sludge backflow tank and at least two secondary sedimentation tanks, wherein each secondary sedimentation tank is connected with the sludge backflow tank through a sludge discharge pipe, and a backflow pump is installed in each sludge backflow tank; the method is characterized in that: the sludge discharge pipe comprises a sludge discharge main pipe and at least two groups of sludge discharge branch pipes connected with the sludge discharge main pipe, and the sludge discharge branch pipes are connected in parallel; the mud discharging branch pipe is provided with a flow limiting valve and a control valve; the operating liquid level of the sludge reflux pool is not higher than the height of a valve port of the flow limiting valve; the installation height of the flow limiting valve is lower than the water level of the secondary sedimentation tank.
2. The uniform sludge discharge system of the secondary sedimentation tank of the sewage treatment plant according to claim 1, characterized in that: the installation height of the flow limiting valve is 1.5-2.5 m lower than the water level of the secondary sedimentation tank.
3. The uniform sludge discharge system of the secondary sedimentation tank of the sewage treatment plant according to claim 1, characterized in that: the control valve is positioned between the sludge return tank and the flow limiting valve.
4. The uniform sludge discharge system of the secondary sedimentation tank of the sewage treatment plant according to claim 1, characterized in that: the flow limiting valve and the control valve are arranged in the valve well.
5. The uniform sludge discharge system of the secondary sedimentation tank of the sewage treatment plant according to claim 1, characterized in that: and a liquid level meter is arranged in the sludge reflux tank.
6. The method for controlling a uniform sludge discharge system of a secondary sedimentation tank of a sewage treatment plant according to any one of claims 1 to 5, wherein: the method comprises the following steps:
(1) according to the design water quantity and the water quality of a sewage plant or the running water quantity and the actual water quality, the maximum values of the reflux quantity and the sludge reflux ratio in the design or operation process are determined in advance, and the grade is divided according to the common data section;
(2) designing the number of the sludge discharge branch pipes, the control valves and the flow limiting valves and the overflowing parameters of the flow limiting valves according to the determined reflux amount and the sludge reflux ratio, so that the combination use of different flow limiting valves can meet the grade of each common data of the sludge reflux ratio;
(3) and during operation, according to the set numerical value of the sludge reflux ratio, the reflux pump and the control valve are linked to meet the sludge reflux ratio and reflux quantity required by the system at different periods.
7. The control method according to claim 6, characterized in that: and the total overflowing parameters of the flow limiting valves on the sludge discharge branch pipes are set consistently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011582029.7A CN112807759A (en) | 2020-12-28 | 2020-12-28 | Uniform sludge discharge system for secondary sedimentation tank of sewage treatment plant and control method thereof |
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| CN202011582029.7A CN112807759A (en) | 2020-12-28 | 2020-12-28 | Uniform sludge discharge system for secondary sedimentation tank of sewage treatment plant and control method thereof |
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Citations (10)
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|---|---|---|---|---|
| JPH04166295A (en) * | 1990-10-29 | 1992-06-12 | Nippon Gesuidou Jigyodan | Activated sludge process by srt control |
| JPH08323109A (en) * | 1995-05-31 | 1996-12-10 | Kurita Water Ind Ltd | Flocculating and settling device |
| CN202046930U (en) * | 2011-04-18 | 2011-11-23 | 日照红叶环保工程有限公司 | Novel water distribution device for anoxic pond |
| CN202860196U (en) * | 2012-10-22 | 2013-04-10 | 中建工业设备安装有限公司 | Sludge flow regulating sleeve valve |
| CN203012479U (en) * | 2012-12-19 | 2013-06-19 | 广州铁路职业技术学院 | Energy-saving sludge reflux control system |
| CN206089335U (en) * | 2016-08-22 | 2017-04-12 | 湖州中环污水处理有限公司 | Sludge returning device |
| CN107628717A (en) * | 2017-09-22 | 2018-01-26 | 张兴业 | A kind of sewage-treatment plant for building |
| CN207221403U (en) * | 2017-09-27 | 2018-04-13 | 浙江三和食品科技有限公司 | A kind of sludge quantitatively flows back settler |
| CN210178586U (en) * | 2019-05-25 | 2020-03-24 | 科特龙流体科技（扬州）有限公司 | Fluid conveying device with flow control function |
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-
2020
- 2020-12-28 CN CN202011582029.7A patent/CN112807759A/en active Pending
Patent Citations (10)
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|---|---|---|---|---|
| JPH04166295A (en) * | 1990-10-29 | 1992-06-12 | Nippon Gesuidou Jigyodan | Activated sludge process by srt control |
| JPH08323109A (en) * | 1995-05-31 | 1996-12-10 | Kurita Water Ind Ltd | Flocculating and settling device |
| CN202046930U (en) * | 2011-04-18 | 2011-11-23 | 日照红叶环保工程有限公司 | Novel water distribution device for anoxic pond |
| CN202860196U (en) * | 2012-10-22 | 2013-04-10 | 中建工业设备安装有限公司 | Sludge flow regulating sleeve valve |
| CN203012479U (en) * | 2012-12-19 | 2013-06-19 | 广州铁路职业技术学院 | Energy-saving sludge reflux control system |
| CN206089335U (en) * | 2016-08-22 | 2017-04-12 | 湖州中环污水处理有限公司 | Sludge returning device |
| CN107628717A (en) * | 2017-09-22 | 2018-01-26 | 张兴业 | A kind of sewage-treatment plant for building |
| CN207221403U (en) * | 2017-09-27 | 2018-04-13 | 浙江三和食品科技有限公司 | A kind of sludge quantitatively flows back settler |
| CN210178586U (en) * | 2019-05-25 | 2020-03-24 | 科特龙流体科技（扬州）有限公司 | Fluid conveying device with flow control function |
| CN110937763A (en) * | 2019-12-26 | 2020-03-31 | 深圳市易水水处理技术有限公司 | Sewage treatment device and sewage treatment system |
Non-Patent Citations (2)
| Title |
|---|
| 唐受印等: "《水处理工程师手册》", 30 April 2000, 化学工业出版社 * |
| 李先瑞: "《供热空调系统运行管理、节能、诊断技术指南》", 31 January 2004, 中国电力出版社 * |
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Application publication date: 20210518 |