CN111362397A - Automatic control method combining constant water level and constant water volume of sewage plant - Google Patents
Automatic control method combining constant water level and constant water volume of sewage plant Download PDFInfo
- Publication number
- CN111362397A CN111362397A CN202010213343.1A CN202010213343A CN111362397A CN 111362397 A CN111362397 A CN 111362397A CN 202010213343 A CN202010213343 A CN 202010213343A CN 111362397 A CN111362397 A CN 111362397A
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- water
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/006—Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
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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
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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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
Abstract
The invention provides an automatic control method combining constant water level and constant water volume in a sewage plant, wherein the sewage plant is provided with a water inlet pump room and at least one pump station, a water inlet pump and a transfer pump are arranged in the water inlet pump room, the water inlet pump is used for conveying water into a biological pool in the sewage plant, the flow rate of the water inlet pump is A, the transfer pump is used for transferring the water to other sewage plants, the pump stations independently convey the water into the biological pool in the plant, the flow rates of the pump stations are B, and the total flow rate in the plant is A + B; the transfer pump executes a constant liquid level control mode to keep the liquid level of the water inlet pump room unchanged; the water inlet pump executes a constant flow control mode to keep the total flow in the plant constant. The automatic control method can realize a 'constant water level + constant water volume' control mode of the sewage plant, stabilize production operation and reduce the water level of the outer pipe network under the condition of ensuring the treatment load of the sewage plant.
Description
Technical Field
The invention relates to a method for automatically controlling water quantity of a sewage plant, in particular to a method for automatically controlling the combination of constant water level and constant water quantity of the sewage plant.
Background
The water quantity control is a core element in the production and operation process of a sewage plant, the larger the fluctuation of the water inflow is, the larger the time variation coefficient is, the higher the control requirements on the concentration of dissolved oxygen and sludge in the plant are, and the smaller the time variation coefficient is, the better the stable production and operation is required. At present, most of sewage plants are started and stopped by an automatic control program of a water inlet pump room only according to the liquid level of the water inlet pump room, the water inlet flow is regulated and controlled, the water quantity conveyed by a pump station pipe network cannot be matched with the water quantity conveyed by an upstream pump station, the phenomenon that the water quantity conveyed by the pump station pipe network exceeds the design load of the sewage plant or the phenomenon of 'early peak and late peak' occurs frequently, and certain influence is caused on sewage plants and pipe network sewage scheduling.
Disclosure of Invention
According to one aspect of the invention, an automatic control method combining constant water level and constant water volume in a sewage plant is provided, the sewage plant is provided with a water inlet pump room and at least one pump station, a water inlet pump and a transfer pump are arranged in the water inlet pump room, the water inlet pump conveys water into a biological pool in the sewage plant, the flow rate of the water inlet pump is A, the transfer pump conveys the water to other sewage plants, the pump stations independently convey water into the biological pool in the plant, the flow rates of the pump stations are B, and the total flow rate in the plant is A + B;
the transfer pump executes a constant liquid level control mode to keep the liquid level of the water inlet pump room unchanged;
the water inlet pump executes a constant flow control mode to keep the total flow in the plant constant.
In some embodiments, when the flow rate B is larger, the frequency of the water inlet pump in the sewage plant is reduced, that is, the flow rate a is reduced, so as to keep the total flow rate in the plant constant, and simultaneously, the frequency of the water transfer pump in the sewage plant is increased, so as to increase the transferred water amount, so as to keep the liquid level of the water inlet pump room in the sewage plant constant.
In some embodiments, when the flow rate B is smaller, the frequency of the water inlet pump in the sewage plant is increased, i.e., the flow rate a is increased, so as to keep the total flow rate in the plant constant, and simultaneously, the frequency of the water transfer pump in the sewage plant is decreased, so as to reduce the transferred water amount, so as to keep the liquid level of the water inlet pump room in the sewage plant constant.
The invention has the beneficial effects that: the control mode of 'constant water level + constant water volume' of the sewage plant can be realized, the production operation is stabilized under the condition of ensuring the treatment load of the sewage plant, and the water level of the outer pipe network is reduced.
Drawings
FIG. 1 is a schematic view of a waterway of a sewage plant according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of parameter setting of a constant liquid level and constant flow control mode according to an embodiment of the present invention.
Fig. 3 is a comparison of average liquid levels before and after the conventional automatic control procedure is modified by the automatic control method of the sewage plant combining the constant water level and the constant water amount according to the embodiment of the present invention.
Fig. 4 is a comparison of daily average liquid levels within 31 days before and after the conventional automatic control procedure is modified by the automatic control method of the sewage plant combining the constant water level and the constant water amount according to the embodiment of the present invention.
Fig. 5 is a certain day flow rate curve before the existing automatic control procedure is modified by the automatic control method of the sewage plant combining the constant water level and the constant water amount according to the embodiment of the invention.
Fig. 6 is a certain day flow rate curve after the existing automatic control program is modified by the constant water level and constant water amount automatic control method for sewage plant water flow rate according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a sewage plant constant water level and constant water quantity combined automatic control method, which is suitable for a sewage plant with N water inlet channels and M water transfer channels, wherein N is more than or equal to 2, and M is more than or equal to 1. The sewage plant has an intake pump house 1 and at least one pump station 2. The water inlet pump room 1 is internally provided with a water inlet pump and a transfer pump, wherein water coming from the water inlet pump room 1 is supplied by an upstream pump station, the water inlet pump conveys the water into a biological pool in a sewage plant, the flow rate of the water inlet pump is A, and the transfer pump transfers the water to other sewage plants. The pumping stations 2 of the sewage plant individually deliver water to the domestic ponds in the plant, and the total flow rate of these pumping stations 2 is B.
The invention provides a sewage plant constant water level and constant water quantity combined automatic control method, which comprises the following steps:
the pump station 2 executes a liquid level control mode, controls the start and stop of a water pump according to the liquid level of the pump station, and directly conveys water quantity to a pretreatment section in a sewage plant, wherein the flow rate is B;
the sewage plant transfer pump executes a constant liquid level control mode, and adjusts the amount of water transferred to the next sewage plant according to the liquid level of the sewage plant water inlet pump room 1;
the sewage plant water inlet pump executes a constant flow control mode, the flow of the water inlet pump is A, the total flow in the plant is flow A + flow B, and the flow A is changed according to the increase and decrease of the flow B, so that the total flow in the plant is kept constant;
when the flow B is larger, the frequency of a water inlet pump in the sewage plant is reduced, namely the flow A is reduced, the total flow in the plant is kept unchanged, meanwhile, the frequency of a transfer pump in the sewage plant is increased, the transfer water quantity is increased, and the liquid level of a water inlet pump room 1 in the sewage plant is kept unchanged;
when the flow B is smaller, the frequency of the water inlet pump in the sewage plant is increased, namely the flow A is increased, the total flow in the plant is kept unchanged, meanwhile, the frequency of the transfer pump in the sewage plant is reduced, the transfer water volume is reduced, and the liquid level of the water inlet pump room 1 in the sewage plant is kept unchanged.
Taking the eastern sewage plant of the district of eastern district of cusu city as an example, the water inlet pump house 1 of the eastern sewage plant has 5 water pumps, the water distribution of the eastern sewage plant has three routes, wherein the 1-3# pump is transferred to the rov river, the 4# and 5# pumps deliver the sewage to the biological pond in the eastern sewage plant, in addition, the eastern ring pump station has four water pumps, which are also used for delivering the sewage to the biological pond in the eastern sewage plant, and the eastern ring pump station is equivalent to the pump station 2 in fig. 1.
The water pump sets for the minimum frequency, and when the frequency reduces to the minimum frequency then closes this water pump, adjusts next platform, reduces the energy consumption. The constant liquid level and constant flow control mode is adjusted according to PID, and the parameter set value is adjusted according to the actual condition of the sewage plant, as shown in FIG. 2.
The automatic control method of the embodiment can realize a 'constant water level + constant water volume' control mode of the sewage plant, stabilize production operation and reduce the water level of the outer pipe network under the condition of ensuring the treatment load of the sewage plant.
Referring to fig. 3, the average liquid level (yellow sea level) before and after the self-control procedure of the eastern municipal sewage plant is modified by the method provided by this embodiment is compared. From fig. 3, it can be seen that the average liquid level of the water inlet pump room of the eastern town sewage plant after the automatic control program modification of the water inlet pump room 1 is 2.82m, which is reduced by 7.8% compared with that before the modification (3.06 m); the average liquid level of the east-ring pump station is 2.86m, which is reduced by 1.4 percent compared with the average liquid level before modification (2.90 m). The average liquid level of the upstream pump station is reduced to-0.45 m from-0.43 m, and the average liquid level of the water inlet pump room of the lower-level sewage plant is reduced by 13.5% compared with the average liquid level of the water inlet pump room before modification (5.85 m).
Referring to fig. 4, the average liquid level (yellow sea level) before and after the self-control procedure of the eastern municipal sewage plant is modified by the method of the present embodiment is compared with the daily average liquid level within 31 days. The figure shows that the water inlet pump room of the eastern City sewage plant is lower and more stable in operation liquid level and more stable in liquid level ascending and descending after being modified in program, and the automatic control method of the invention reflects the action of the variable frequency pump. After the transformation, the stability of the water level of the water inlet pump room and the pipe network of the sewage plant is improved.
Referring to fig. 5, the flow curve of the eastern sewage plant before the self-control procedure is modified by the method of the present embodiment. It can be seen that when the flow of the east ring pump station is increased or decreased, the water inlet pump room of the eastern sewage plant is not adjusted in time, so that the total water fluctuation is large, and the subsequent DO control of the biological section is influenced to a certain extent.
Referring to fig. 6, the flow rate curve of the eastern sewage plant after the self-control procedure is modified by the method of the present embodiment is shown. It can be seen that when the flow of the east ring pump station is increased or decreased, the water inlet pump room in the east sewage plant is correspondingly adjusted in time, so that the total water amount is basically kept unchanged.
3-6, the overall average liquid level of the sewage pipe network zone is reduced by adopting a constant water level and constant water volume control mode, so that effective guarantee is provided for low water level operation work; the fluctuation of the inflow flow is reduced, so that the impact load borne by the biological pond is reduced.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (3)
1. The automatic control method combining the constant water level and the constant water volume in the sewage plant is characterized in that the sewage plant is provided with a water inlet pump room and at least one pump station, a water inlet pump and a transfer pump are arranged in the water inlet pump room, the water inlet pump conveys water into a biological pool in the sewage plant, the flow rate of the water inlet pump is A, the transfer pump transfers the water to other sewage plants, the pump station independently conveys the water volume to the biological pool in the plant, the flow rate of the pump station is B, and the total flow rate in the plant is A + B;
the transfer pump executes a constant liquid level control mode to keep the liquid level of the water inlet pump room unchanged;
the water inlet pump executes a constant flow control mode to keep the total flow in the plant constant.
2. The method of claim 1, wherein when the flow rate B is larger, the frequency of the water inlet pump is decreased, i.e., the flow rate A is decreased, to keep the total flow rate constant, and the frequency of the transfer pump is increased to increase the transfer water amount, so as to keep the liquid level in the water inlet pump room constant.
3. The method of claim 1 or 2, wherein when the flow rate B is small, the frequency of the water inlet pump is increased, i.e. the flow rate A is increased, to keep the total flow rate in the plant constant, and the frequency of the transfer pump is decreased to reduce the transfer water amount and keep the liquid level in the water inlet pump room constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210454660.1A CN114702120A (en) | 2020-03-24 | 2020-03-24 | Automatic control system and method combining constant water level and constant water volume of sewage plant |
| CN202010213343.1A CN111362397A (en) | 2020-03-24 | 2020-03-24 | Automatic control method combining constant water level and constant water volume of sewage plant |
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| CN202010213343.1A CN111362397A (en) | 2020-03-24 | 2020-03-24 | Automatic control method combining constant water level and constant water volume of sewage plant |
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| CN202210454660.1A Division CN114702120A (en) | 2020-03-24 | 2020-03-24 | Automatic control system and method combining constant water level and constant water volume of sewage plant |
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| CN202210454660.1A Pending CN114702120A (en) | 2020-03-24 | 2020-03-24 | Automatic control system and method combining constant water level and constant water volume of sewage plant |
| CN202010213343.1A Pending CN111362397A (en) | 2020-03-24 | 2020-03-24 | Automatic control method combining constant water level and constant water volume of sewage plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112160899A (en) * | 2020-09-29 | 2021-01-01 | 北京城市排水集团有限责任公司 | Intelligent control method and system for water inlet pump room |
| CN112281978A (en) * | 2020-09-24 | 2021-01-29 | 北控中科成环保集团有限公司 | High-adaptability tap water supply system and tap water supply method thereof |
| CN113392506A (en) * | 2021-05-21 | 2021-09-14 | 苏州市排水有限公司 | Optimal configuration method for regional sewage pump station joint scheduling based on flow |
| CN113568440A (en) * | 2021-07-21 | 2021-10-29 | 上海市城市建设设计研究总院（集团）有限公司 | Large-scale sewage system auxiliary scheduling method based on multi-data source analysis |
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| JP2002224661A (en) * | 2001-02-02 | 2002-08-13 | Nkk Corp | Comprehensive management system for sewage treatment |
| JP5306214B2 (en) * | 2006-10-25 | 2013-10-02 | リバルシオ コーポレイション | Mixing equipment |
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2020
- 2020-03-24 CN CN202210454660.1A patent/CN114702120A/en active Pending
- 2020-03-24 CN CN202010213343.1A patent/CN111362397A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009063501A2 (en) * | 2007-09-20 | 2009-05-22 | Amin Rahul Nanubhai | A pumping system for pumping liquid from a lower level to an operatively higher level |
| US8371821B1 (en) * | 2012-08-17 | 2013-02-12 | Nasser Fred Mehr | Green waste water pump station control system |
| CN107176628A (en) * | 2017-04-20 | 2017-09-19 | 清华大学 | A kind of Dispatching Control System and method for sewerage |
| CN108279632A (en) * | 2018-02-09 | 2018-07-13 | 杭州亚大自动化有限公司 | A kind of pumping plant wisdom draining Dispatching Control System |
| CN109032195A (en) * | 2018-07-27 | 2018-12-18 | 杭州电子科技大学 | A kind of sewage pumping station water discharge control method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112281978A (en) * | 2020-09-24 | 2021-01-29 | 北控中科成环保集团有限公司 | High-adaptability tap water supply system and tap water supply method thereof |
| CN112160899A (en) * | 2020-09-29 | 2021-01-01 | 北京城市排水集团有限责任公司 | Intelligent control method and system for water inlet pump room |
| CN113392506A (en) * | 2021-05-21 | 2021-09-14 | 苏州市排水有限公司 | Optimal configuration method for regional sewage pump station joint scheduling based on flow |
| CN113568440A (en) * | 2021-07-21 | 2021-10-29 | 上海市城市建设设计研究总院（集团）有限公司 | Large-scale sewage system auxiliary scheduling method based on multi-data source analysis |
| CN113568440B (en) * | 2021-07-21 | 2023-09-01 | 上海市城市建设设计研究总院（集团）有限公司 | Auxiliary scheduling method for large-scale sewage system based on multi-data source analysis |
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| CN114702120A (en) | 2022-07-05 |
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Application publication date: 20200703 |