CN117648003B - Sewage pipe network pollutant deposition and overflow cooperative control system and control method - Google Patents
Sewage pipe network pollutant deposition and overflow cooperative control system and control method Download PDFInfo
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Abstract
The invention provides a sewage pipe network pollutant deposition and overflow cooperative control system and a control method, wherein the control system comprises a plurality of sewage main pipes, inspection wells, tail end pump stations, lifting pump sets and controllers, wherein adjacent sewage main pipes are connected through the inspection wells, the tail ends of the sewage main pipes are connected with the tail end pump stations, the lifting pump sets are arranged in the tail end pump stations, liquid level meters and flow velocity meters are arranged in the sewage main pipes, and the controllers are respectively connected with the lifting pump sets, the liquid level meters and the flow velocity meters. The invention adopts the fine comprehensive regulation measures of reducing the urban river and lake constant liquid level, the high water level operation of the non-sewage peak period sewage main pipe, the low water level and high flow rate operation of the sewage peak period sewage main pipe, flushing and separating sediment and the like, and can solve the problems of sewage granular pollutant deposition, low urban domestic sewage centralized collection rate, urban water body pollution caused by pipe network sewage overflow and the like caused by the high water level and low flow rate operation under the condition of large amount of river and lake water infiltration of the existing urban sewage pipe network.
Description
Technical Field
The invention belongs to the technical field of drainage systems, and particularly relates to a sewage pipe network pollutant deposition and overflow cooperative control system and a control method.
Background
In recent years, urban sewage treatment, quality improvement and synergy three-year action implementation schemes are established all over the country, a large number of engineering projects such as pipe network investigation, repair, sewage interception and nano-tube diversion system transformation are implemented, but the engineering projects have little effect from the viewpoint of the change of the examination index of urban domestic sewage centralized collection rate. Through large-scale investigation and analysis, a large amount of domestic sewage pollutants are not collected in a sewage treatment plant in a terminal town, but are deposited in a sewage collection pipe network, a lifting pump station and other transfer links, and the main reasons are that a large amount of non-domestic sewage is mixed in a municipal sewage pipe network in China, including river and lake water, construction precipitation and the like, wherein the inflow and infiltration of the river and lake water are mainly used as influencing factors, the sewage pipe network runs at a high water level for a long time, and the sewage pipe network directly causes low flow velocity, so that the pipe network becomes a large sedimentation tank, and granular pollutants in sewage are deposited and separated in a large amount in a pipe network system, so that the important phenomenon of restricting the improvement of the urban sewage pollutant collection efficiency is urgently solved. Meanwhile, the sewage pipe network is found to run at a high water level for a long time, and in the peak period of sewage generation in the daytime, such as the period of 7:30-10:00 a.m. or 18:00-22:30 a.m., the local sewage pipe network can have the problem that sewage overflows from a sewage inspection well, pollutes the nearby street or urban water body, and causes the problems of environmental sanitation and water environment pollution.
Based on the problems, at present, a large number of cities mainly adopt measures such as pipe network restoration, pipe network diameter increase and the like to improve the sewage pollutant collection capacity, but the restoration and new construction of a large number of pipe networks are huge, the construction cost of a pipeline with the length of 10km and the diameter of 1 meter is up to billions, moreover, the restoration time cost is huge, and the short-term effect is difficult.
Based on this, it is needed to provide a sewage pipe network pollutant deposition and overflow cooperative control system and control method.
Disclosure of Invention
The invention aims to overcome the defects of the operation control method of the existing sewage pipe network system and provides a sewage pipe network pollutant deposition and overflow cooperative control system and a control method. The invention adopts the technical measures of fine comprehensive regulation and control for reducing the urban river and lake constant liquid level to prevent external water from infiltrating into a sewage pipe network, improving the liquid level of a pump station by the high-water-level operation of a non-sewage-high-peak-period sewage main pipe, flushing deposited pollutants by the high-flow-rate operation formed by the low-water-level operation of the sewage main pipe in the sewage high-peak-period, and the like, and can solve the multiple targets of sewage granular pollutant deposition, low concentration of inflow organic matters of an end urban sewage plant, low concentration and collection rate of urban domestic sewage, pollution of urban water body by overflow of pipe network sewage, large emission of greenhouse gases, and the like caused by the high-water-level low-flow-rate operation of the large-volume river and lake water infiltration condition of the existing urban sewage pipe network, and the like, thereby realizing the multiple aims of reducing the operating water level of the sewage pipe network, improving the pipeline flow rate, flushing deposited pollutants, reducing the low-carbon operation of a drainage system, reducing the overflow risk in peak period, and the like.
In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the invention is as follows:
In a first aspect, an embodiment of the invention provides a sewage pipe network pollutant deposition and overflow cooperative control system, which comprises a plurality of sewage main pipes, inspection wells, tail end pump stations, lifting pump sets and controllers, wherein adjacent sewage main pipes are connected through the inspection wells, the tail ends of the sewage main pipes are connected with the tail end pump stations, the lifting pump sets are arranged in the tail end pump stations, liquid level meters and flow velocity meters are arranged in the sewage main pipes, and the controllers are respectively connected with the lifting pump sets, the liquid level meters and the flow velocity meters through signal transmission.
In a second aspect, an embodiment of the present invention provides a method for controlling the deposition and overflow of a sewage pipe network, where the method uses the cooperative control system for the deposition and overflow of a sewage pipe network according to the first aspect to control, and the method includes the following steps:
a. Reducing the existing running constant liquid level H Often times of the sewage pipe network coverage area and the surrounding urban rivers and lakes by 0.5-2m, so that the reduced running constant liquid level H' of the rivers and lakes is positioned below the pipe bottom elevation at the tail end of the sewage main pipe;
b. high water level operation of the non-sewage main pipe in the peak period: the method comprises the steps of reducing the operation flow of a lifting pump set in a tail end pump station through a controller in a non-sewage peak period, enabling a sewage main pipe and the tail end pump station to be in a high water level operation state, reducing the operation power consumption of the lifting pump set, and simultaneously carrying out precipitation separation on granular pollutants in sewage;
c. The sewage main pipe is operated at low water level in the peak period of sewage quantity: the sewage peak period increases the operation flow of the lifting pump set through the controller, so that the sewage main pipe and the tail end pump station are in a low-water-level high-flow-rate operation state, and sediment formed by non-sewage peak period high-water-level operation can be flushed and separated from the sewage main pipe by high-flow-rate sewage;
wherein steps b and c are cyclically alternated.
Further, in the high water level running state in the step b, the sewage flow rate is less than 0.6m/s, and the water depth h 1 in the sewage main pipe is controlled to be (60% -75%) D;
In the low water level running state in the step c, the sewage flow rate is more than or equal to 0.6m/s, and the water depth h 2 in the sewage main pipe is controlled to be (15% -40%) D;
wherein D is the pipe diameter of the sewage main pipe.
Further, in the step c, the sewage peak period is two periods within 24 hours per day, namely 7:30-10:00 and 18:00-22:30 respectively;
in the step b, the non-sewage peak period is a period outside the sewage peak period.
In step b, the non-sewage peak period sequentially comprises a transition section from a low water level to a high water level, a non-transition section and a transition section from a high water level to a low water level, wherein the duration of the transition section is 0.5-1h, and the specific duration of the transition section is analyzed, determined and regulated by the controller by combining the actual control water depth h under the high and low water level running states and the running flow of the lifting pump set.
Further, the controller starts to increase the operation flow of the lifting pump set at the starting point of the transition section from the high water level to the low water level, so that the operation water level of the sewage main pipe is transited from the high water level to a low water level operation state required by the sewage peak period when the transition section is ended;
And the controller starts to reduce the operation flow of the lifting pump set at the beginning of the transition section from the low water level to the high water level, so that the operation water level of the sewage main pipe is transited from the low water level to a high water level operation state required by a non-sewage peak period when the transition section is ended.
Further, the input parameters of the controller comprise control water depth in a high-water level running state and a low-water level running state, real-time running water level of the sewage main pipe monitored by the liquid level meter, real-time sewage flow rate of the sewage main pipe in the low-water level running state monitored by the flow velocity meter, design gradient of the sewage main pipe, elevation of the bottom of the starting end pipe and distance from the setting point of the liquid level meter to the starting end of the sewage main pipe;
The controller dynamically regulates and controls the real-time operation flow of the lifting pump set according to the requirements of the sewage flow rate of more than or equal to 0.6m/s on the flushing and separating of the sediment of the sewage main pipe in the high-and low-water-level operation state of the sewage main pipe, the duration of the transition section and the sewage peak period.
Further, the liquid level meter is used for monitoring the actual running water level Z in the sewage main pipe in real time, and combining the calculation of the actual water depth H of the sewage main pipe and the control water depth range corresponding to the high water level running state and the low water level running state, the real-time guidance controller dynamically regulates and controls the running flow of the lifting pump set and the variable water level running of the sewage main pipe, wherein the calculation formula of the actual water depth H of the sewage main pipe is h=Z-H+i, H is the pipe bottom elevation at the beginning end of the sewage main pipe provided with the liquid level meter, i is the gradient of the sewage main pipe, and L is the distance from the setting point of the liquid level meter to the beginning end of the sewage main pipe.
Further, the flow rate meter is used for monitoring the actual flow rate of the sewage in the sewage main pipe in the low-water-level running state of the sewage in the peak period in real time, so that the controller can analyze and judge whether the actual flow rate of the sewage meets the flow rate requirement that the flow rate of the sewage is more than or equal to 0.6m/s in the low-water-level running state in real time, and when the actual flow rate of the sewage is less than 0.6m/s in the low-water-level running state, the controller can regulate and control the running flow rate of the lifting pump set in real time, so that the running water level of the sewage main pipe is further reduced, and the actual flow rate of the sewage in the sewage main pipe is more than or equal to 0.6m/s in the low-water-level running state of the sewage in the peak period is ensured.
Furthermore, the lifting pump set is configured by adopting a combination of a size variable frequency pump, so that the controller can dynamically and accurately regulate the real-time operation flow of the lifting pump set.
The invention has the following advantages and positive effects:
1. Aiming at the problems of sedimentation and separation of sewage granular pollutants, overflow of sewage in peak period, large carbon emission and the like caused by high-water-level operation of the existing sewage pipe network system, the invention solves the series of problems of sedimentation of sewage granular pollutants, low concentration of organic matters in water inflow of terminal urban sewage plants, low concentration and collection rate of urban domestic sewage, overflow of sewage to pollute urban water, large emission of greenhouse gases and the like caused by high-water-level and low-flow-rate operation of the main sewage pipe in non-sewage peak period, and the like by adopting fine comprehensive regulation measures of reducing the pumping energy consumption of a pump station, flushing and separating the sediments by the main sewage pipe in the sewage peak period and the low-water-level and high-flow-rate operation of the main sewage pipe in the sewage peak period.
2. The invention comprehensively aims at flushing the sediment of the sewage pipe network and improving the energy-saving operation of the pump station, combines the change rule of the sewage amount of the sewage pipe network, innovatively adopts the high-low water level alternate operation mode of the main sewage pipe, does not need to repair, newly build or reform the sewage pipe network system on a large scale, can realize the aim of improving the centralized collection rate of the urban domestic sewage in the shortest time and has remarkable economic, social and environmental benefits.
3. The method has strong pertinence, practicability and operability, can provide a new thought for low-carbon design, construction and operation of urban sewage pipe network systems in China, and has important practical significance for improving the concentration of organic matters in water entering a sewage treatment plant in a terminal urban area and the centralized collection rate of urban domestic sewage.
Drawings
FIG. 1 is a schematic diagram of a method for reducing urban river and lake liquid level in a sewage pipe network coverage area according to the invention.
FIG. 2 is a schematic diagram of the high water level operation method of the non-sewage high peak period sewage main pipe of the invention.
FIG. 3 is a schematic diagram of the low water level operation method of the sewage main pipe in the peak sewage period of the invention.
FIG. 4 is a schematic diagram showing dynamic regulation and control of water level change and pump station lifting pump set in 24 hours per day of the sewage main pipe.
Reference numerals illustrate: 1-a sewage main pipe; 2-an inspection well; 3-end pump station; 4-lifting a pump group; 5-a liquid level gauge; 6-a flow rate meter; 7-a controller.
Detailed Description
The utility model provides a sewage pipe network pollutant deposit and overflow cooperative control system, includes a plurality of sewage main pipes 1, inspection shaft 2, terminal pump station 3, promotes pump unit 4 and controller 7, wherein is connected through inspection shaft 2 between the adjacent sewage main pipe 1, and the terminal of sewage main pipe 1 is connected with terminal pump station 3, is provided with in the terminal pump station 3 and promotes pump unit 4, is provided with level gauge 5 and current meter 6 in the sewage main pipe 1, and controller 7 is connected through signal transmission with promotion pump unit 4, level gauge 5 and current meter 6 respectively.
A sewage pipe network pollutant deposition and overflow cooperative control method comprises the following steps:
a. The existing running constant liquid level H Often times of the sewage pipe network coverage area and the surrounding urban river and lake is reduced by 0.5-2m, so that the reduced running constant liquid level H' of the river and lake is positioned below the bottom elevation of the tail end pipe of the sewage main pipe 1, the infiltration of the river and lake water into the urban sewage pipe network is controlled to the greatest extent, and preconditions are provided for the follow-up fine running regulation and control of the sewage main pipe 1;
b. high water level operation of the non-sewage main pipe in the peak period: the operation flow of the lifting pump set 4 in the tail end pump station 3 is reduced through the controller 7 in the non-sewage peak period, so that the sewage main pipe 1 and the tail end pump station 3 are in a high-water-level operation state, the operation power consumption of the lifting pump set 4 is reduced, and meanwhile, the precipitation separation of granular pollutants in sewage is carried out;
The flow rate of the sewage main pipe 1 is lower in a high water level running state, the flow rate is less than 0.6m/s, and simultaneously, granular organic matters in the sewage can be gravity-settled to the bottom of the sewage main pipe 1 to form a large amount of sediment;
c. The sewage main pipe is operated at low water level in the peak period of sewage quantity: the operation flow of the lifting pump set 4 is increased through the controller 7 in the peak period of sewage, so that the sewage main pipe 1 and the tail end pump station 3 are in a low-water-level high-flow-rate operation state, and sediment formed by the non-sewage peak period high-water-level operation is flushed and separated from the sewage main pipe by high-flow-rate sewage;
wherein steps b and c are cyclically alternated.
On the one hand, the sewage flow rate is higher in the low-water-level running state of the sewage main pipe 1, the flow rate is more than or equal to 0.6m/s, granular organic matters in the sewage cannot be settled by gravity, a large amount of sediments containing the organic matters formed at the bottom of the sewage main pipe 1 in the non-sewage peak period are flushed to the tail end pump station 3, and then enter a treatment unit of a town sewage treatment plant along with the sewage under the lifting of the lifting pump set 4; on the other hand, the running state of the sewage main pipe 1 at a low water level provides sufficient space for urban sewage in the peak period of sewage quantity, and can effectively avoid overflow of sewage pipe network sewage from the inspection well 2.
In the high water level operation state in the step b, the sewage flow rate is less than 0.6m/s, and the water depth h 1 in the sewage main pipe 1 is controlled to be (60% -75%). D;
In the low water level running state in the step c, the sewage flow rate is more than or equal to 0.6m/s, and the water depth h 2 in the sewage main pipe 1 is controlled to be (15% -40%) D;
wherein D is the pipe diameter of the sewage main pipe 1.
As shown in fig. 4, in the step c, the peak period of sewage is two periods within 24 hours per day, namely 7:30-10:00 and 18:00-22:30 respectively;
In the step b, the non-sewage peak period is a period except the sewage peak period, namely, the non-sewage peak period is a period except two periods 7:30-10:00 and 18:00-22:30 within 24 hours per day.
In the step b, the non-sewage peak period sequentially comprises a transition section from a low water level to a high water level, a non-transition section and a transition section from a high water level to a low water level, wherein the duration of the transition section is 0.5-1h, and the specific duration of the transition section is analyzed, determined and regulated by the controller 7 mainly in combination with the actual control water depth h under the high water level and low water level running state and the running flow of the lifting pump set 4.
Specifically, the starting point controller 7 of the transition section from the high water level to the low water level starts to increase the operation flow rate of the lifting pump group 4, so that the operation water level of the sewage main pipe 1 at the end of the transition section is transited from the high water level to the low water level operation state required by the sewage peak period;
The starting point controller 7 of the transition section from the low water level to the high water level starts to reduce the operation flow rate of the lifting pump set 4, so that the operation water level of the sewage main pipe 1 at the end of the transition section is transited from the low water level to the high water level operation state required by the non-sewage peak period.
The input parameters of the controller 7 comprise the control water depth in the high and low water level running state, the real-time running water level of the sewage main pipe 1 monitored by the liquid level meter 5, the real-time sewage flow rate of the sewage main pipe 1 in the low water level running state monitored by the flow velocity meter 6, the design gradient of the sewage main pipe 1 and the elevation of the bottom of the starting pipe, and the distance from the setting point of the liquid level meter 5 to the starting end of the sewage main pipe 1;
in combination with the requirements of sediment flushing separation of the sewage main pipe 1 on the sewage flow rate of more than or equal to 0.6m/s in the high-water level and low-water level running state of the sewage main pipe 1 for controlling the water depth, the duration of the transition section and the sediment flushing separation of the sewage peak period, the controller 7 dynamically regulates and controls the real-time running flow of the lifting pump set 4.
The liquid level meter 5 is used for monitoring the actual running water level Z in the sewage main pipe 1 in real time, and in combination with the accounting of the actual water depth H of the sewage main pipe 1 and the control water depth range corresponding to the high and low water level running states, the real-time guidance controller 7 dynamically regulates and controls the running flow of the lifting pump set 4 and the variable water level running of the sewage main pipe 1, wherein the accounting formula of the actual water depth H of the sewage main pipe 1 is h=Z-H+i.L, H is the pipe bottom elevation at the beginning end of the sewage main pipe 1 where the liquid level meter 5 is arranged, i is the gradient of the sewage main pipe 1, and L is the distance from the setting point of the liquid level meter 5 to the beginning end of the sewage main pipe 1.
The flow meter 6 is used for monitoring the actual flow rate of the sewage in the sewage main pipe 1 in the low-water-level running state at the peak period of the sewage in real time, so that the controller 7 can analyze and judge whether the actual flow rate of the sewage meets the flow rate requirement that the flow rate of the sewage is more than or equal to 0.6m/s in the low-water-level running state, and when the actual flow rate of the sewage is less than 0.6m/s in the low-water-level running state, the controller 7 can regulate and control the running flow of the lifting pump set 4 in real time, thereby further reducing the running water level of the sewage main pipe 1 and ensuring that the actual flow rate of the sewage in the sewage main pipe 1 in the low-water-level running state at the peak period of the sewage is more than or equal to 0.6m/s.
The lifting pump set 4 is configured by adopting a combination of a large variable frequency pump and a small variable frequency pump, so that the controller 7 can dynamically and accurately regulate the real-time operation flow of the lifting pump set 4.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
A sewage pipe network pollutant deposition and overflow cooperative control method comprises the following steps:
a. Reduce the sewage pipe network coverage area and the surrounding city river and lake liquid level H Often times : as shown in fig. 1, the existing running constant liquid level H Often times of the sewage pipe network coverage area and the surrounding urban river and lake is reduced by 0.5m, so that the reduced running constant liquid level H' of the river and lake is positioned below the pipe bottom elevation at the tail end of the sewage main pipe 1, the infiltration of the river and lake water into the urban sewage pipe network is controlled to the greatest extent, and preconditions are provided for the follow-up fine running regulation and control of the sewage main pipe 1;
b. High water level operation of the non-sewage main pipe in the peak period: as shown in fig. 2 and 4, during non-sewage peak periods (periods outside the sewage peak periods), the controller 7 is used for reducing the operation flow of the lifting pump set 4 in the tail end pump station 3, so that the sewage main pipe 1 and the tail end pump station 3 are in a high-water-level operation state, the operation power consumption of the lifting pump set 4 is reduced, and meanwhile, the precipitation separation of particulate pollutants in sewage is accompanied;
Because the flow velocity of the sewage main pipe 1 is less than 0.6m/s in a high water level running state, granular organic matters in the sewage can be gravity-settled to the bottom of the sewage main pipe 1 to form a large amount of sediment; wherein the fullness of the sewage main pipe 1, namely the water depth h/pipe diameter D, is controlled to be 60% in the high water level running state;
c. The sewage main pipe is operated at low water level in the peak period of sewage quantity: as shown in fig. 3 and 4, during the peak period of sewage (two periods within 24 hours each day are 7:30-10:00 and 18:00-22:30 respectively), the operating flow rate of the lifting pump set 4 is increased by the controller 7, so that the sewage main pipe 1 and the tail end pump station 3 are in a low-water-level high-flow-rate operating state, and sediment formed by the non-sewage peak period high-water-level operation is flushed and separated from the sewage main pipe by high-flow-rate sewage;
wherein steps b and c are cyclically alternated.
On one hand, as the sewage flow rate is more than or equal to 0.6m/s in the low water level running state of the sewage main pipe 1, granular organic matters in the sewage can not be settled by gravity, and a large amount of sediments containing the organic matters formed at the bottom of the sewage main pipe 1 in the non-sewage peak period can be flushed to the tail end pump station 3 and then enter a processing unit of a town sewage treatment plant along with the sewage under the lifting of the lifting pump set 4; on the other hand, the running state of the sewage main pipe 1 at a low water level provides sufficient space for urban sewage in the peak period of sewage quantity, and can effectively avoid overflow of sewage pipe network sewage from the inspection well 2. Wherein the fullness of the sewage main pipe, namely the water depth h/pipe diameter D, is controlled to be 15% in the low water level running state.
Example 2
A sewage pipe network pollutant deposition and overflow cooperative control method comprises the following steps:
a. Reduce the sewage pipe network coverage area and the surrounding city river and lake liquid level H Often times : as shown in fig. 1, the existing running constant liquid level H Often times of the sewage pipe network coverage area and the surrounding urban river and lake is reduced by 2m, so that the reduced running constant liquid level H' of the river and lake is lower than the elevation of the tail end pipe bottom of the sewage main pipe 1, the infiltration of the river and lake water into the urban sewage pipe network is controlled to the greatest extent, and preconditions are provided for the follow-up fine running regulation and control of the sewage main pipe 1;
b. High water level operation of the non-sewage main pipe in the peak period: as shown in fig. 2 and 4, during non-sewage peak periods (periods outside the sewage peak periods), the operating flow rate of the lifting pump set 4 of the tail end pump station 3 is reduced through the controller 7, so that the sewage main pipe 1 and the tail end pump station 3 are in a high-water-level operating state, the operating power consumption of the lifting pump set 4 of the tail end pump station 3 is reduced, and meanwhile, precipitation separation of particulate pollutants in sewage is accompanied;
Because the flow velocity of the sewage main pipe 1 is less than 0.6m/s in a high water level running state, granular organic matters in the sewage can be gravity-settled to the bottom of the sewage main pipe 1 to form a large amount of sediment; wherein the fullness of the sewage main pipe, namely the water depth h/pipe diameter D, is controlled to be 75% in the high water level running state;
c. The sewage main pipe is operated at low water level in the peak period of sewage quantity: as shown in fig. 3 and 4, during the peak period of sewage (two periods within 24 hours each day are 7:30-10:00 and 18:00-22:30 respectively), the operating flow rate of the lifting pump set 4 is increased through the controller 7, so that the sewage main pipe 1 and the tail end pump station 3 are in a low-water-level high-flow-rate operating state, and sediment formed by the non-sewage peak period high-water-level operation is flushed and separated from the sewage main pipe by high-flow-rate sewage;
wherein steps b and c are cyclically alternated.
On one hand, as the sewage flow rate is more than or equal to 0.6m/s in the low water level running state of the sewage main pipe 1, granular organic matters in the sewage can not be settled by gravity, and a large amount of sediments containing the organic matters formed at the bottom of the sewage main pipe 1 in the non-sewage peak period can be flushed to the tail end pump station 3 and then enter a processing unit of a town sewage treatment plant along with the sewage under the lifting of the lifting pump set 4; on the other hand, the running state of the sewage main pipe 1 at a low water level provides sufficient space for urban sewage in the peak period of sewage quantity, and can effectively avoid overflow of sewage pipe network sewage from the inspection well 2. Wherein the fullness of the sewage main pipe, namely the water depth h/pipe diameter D, is controlled to be 40% under the low water level running state.
Example 3
A sewage pipe network pollutant deposition and overflow cooperative control method comprises the following steps:
a. Reduce the sewage pipe network coverage area and the surrounding city river and lake liquid level H Often times : as shown in fig. 1, the existing running constant liquid level H Often times of the sewage pipe network coverage area and the surrounding urban river and lake is reduced by 1m, so that the reduced running constant liquid level H' of the river and lake is lower than the elevation of the tail end pipe bottom of the sewage main pipe 1, the infiltration of the river and lake water into the urban sewage pipe network is controlled to the greatest extent, and preconditions are provided for the follow-up fine running regulation and control of the sewage main pipe 1;
b. High water level operation of the non-sewage main pipe in the peak period: as shown in fig. 2 and 4, during non-sewage peak periods (periods outside the sewage peak periods), the operating flow rate of the lifting pump set 4 of the tail end pump station 3 is reduced through the controller 7, so that the sewage main pipe 1 and the tail end pump station 3 are in a high-water-level operating state, the operating power consumption of the lifting pump set 4 of the tail end pump station 3 is reduced, and meanwhile, precipitation separation of particulate pollutants in sewage is accompanied;
Because the flow velocity of the sewage main pipe 1 is less than 0.6m/s in a high water level running state, granular organic matters in the sewage can be gravity-settled to the bottom of the sewage main pipe 1 to form a large amount of sediment; wherein the control fullness of the sewage main pipe in the high water level running state, namely the water depth h/pipe diameter D is 70%;
c. The sewage main pipe is operated at low water level in the peak period of sewage quantity: as shown in fig. 3 and 4, during the peak period of sewage (two periods within 24 hours each day are 7:30-10:00 and 18:00-22:30 respectively), the operating flow rate of the lifting pump set 4 of the tail end pump station 3 is increased by the controller 7, so that the sewage main pipe 1 and the tail end pump station 3 are in a low-water-level high-flow-rate operating state, and sediment formed by non-sewage peak period high-water-level operation is flushed and separated from the sewage main pipe by high-flow-rate sewage;
wherein steps b and c are cyclically alternated.
On the one hand, as the sewage flow rate is more than or equal to 0.6m/s in the low water level running state of the sewage main pipe 1, granular organic matters in the sewage can not be settled by gravity, and a large amount of sediments containing the organic matters formed at the bottom of the sewage main pipe 1 in the non-sewage peak period can be flushed to the tail end pump station 3, and then enter into a treatment unit of a town sewage treatment plant along with the sewage under the lifting of the lifting pump set 4 of the tail end pump station 3; on the other hand, the running state of the sewage main pipe 1 at a low water level provides sufficient space for urban sewage in the peak period of sewage quantity, and can effectively avoid overflow of sewage pipe network sewage from the inspection well 2. Wherein the fullness of the sewage main pipe, namely the water depth h/pipe diameter D, is controlled to be 30% under the low water level running state.
In step b of embodiments 1-3, the non-sewage peak period sequentially includes a low water level to high water level transition section, a non-transition section, and a high water level to low water level transition section, wherein the duration of the transition sections is 0.5-1h, and the specific duration of the transition sections is determined and regulated by the controller 7 mainly in combination with the actual control water depth h and the operation flow of the lift pump set 4 in the high and low water level operation state.
Specifically, the starting point controller 7 of the transition section from the high water level to the low water level starts to increase the operation flow rate of the lifting pump group 4, so that the operation water level of the sewage main pipe 1 at the end of the transition section is transited from the high water level to the low water level operation state required by the sewage peak period;
The starting point controller 7 of the transition section from the low water level to the high water level starts to reduce the operation flow rate of the lifting pump set 4, so that the operation water level of the sewage main pipe 1 at the end of the transition section is transited from the low water level to the high water level operation state required by the non-sewage peak period.
The input parameters of the controller 7 in embodiments 1-3 include the control water depth in the high and low water level operation state, the real-time operation water level of the sewage main pipe 1 monitored by the liquid level meter 5, the real-time sewage flow rate of the sewage main pipe 1 in the low water level operation state monitored by the flow rate meter 6, the design gradient and the initial pipe bottom elevation of the sewage main pipe 1, and the distance from the setting point of the liquid level meter 5 to the initial end of the sewage main pipe 1;
in combination with the requirements of sediment flushing separation of the sewage main pipe 1 on the sewage flow rate of more than or equal to 0.6m/s in the high-water level and low-water level running state of the sewage main pipe 1 for controlling the water depth, the duration of the transition section and the sediment flushing separation of the sewage peak period, the controller 7 dynamically regulates and controls the real-time running flow of the lifting pump set 4.
In embodiments 1-3, the liquid level meter 5 is used for monitoring the actual running water level Z in the main sewage pipe 1 in real time, and in combination with the accounting of the actual water depth H of the main sewage pipe 1 and the control water depth ranges corresponding to the high and low water level running states, the real-time guidance controller 7 dynamically regulates and controls the running flow of the lifting pump set 4 and the variable water level running of the main sewage pipe 1, wherein the accounting formula of the actual water depth H of the main sewage pipe 1 is h=z-h+i×l, where H is the pipe bottom elevation at the start end of the main sewage pipe 1 where the liquid level meter 5 is set, i is the gradient of the main sewage pipe 1, and L is the distance from the set point of the liquid level meter 5 to the start end of the main sewage pipe 1.
In embodiments 1-3, the flow rate meter 6 is used for monitoring the actual flow rate of the sewage in the sewage main pipe 1 in the low water level operation state of the sewage peak period in real time, so that the controller 7 can analyze and judge in real time whether the actual flow rate of the sewage meets the flow rate requirement that the sewage flow rate is more than or equal to 0.6m/s in the low water level operation state, and when the actual flow rate of the sewage is less than 0.6m/s in the low water level operation state, the controller 7 can regulate and control the operation flow rate of the lifting pump set 4 in real time, thereby further reducing the operation water level of the sewage main pipe 1 and ensuring that the actual flow rate of the sewage in the sewage main pipe 1 in the low water level operation state of the sewage peak period is more than or equal to 0.6m/s.
In embodiments 1-3, the lift pump unit 4 is configured by adopting a combination of size variable frequency pumps, so that the controller 7 can dynamically and accurately regulate the real-time operation flow of the lift pump unit 4.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (9)
1. The sewage pipe network pollutant deposition and overflow cooperative control method is characterized by comprising the steps of controlling by utilizing a sewage pipe network pollutant deposition and overflow cooperative control system, wherein the sewage pipe network pollutant deposition and overflow cooperative control system comprises a plurality of sewage main pipes (1), an inspection well (2), tail end pump stations (3), lifting pump sets (4) and controllers (7), wherein adjacent sewage main pipes (1) are connected through the inspection well (2), the tail ends of the sewage main pipes (1) are connected with the tail end pump stations (3), lifting pump sets (4) are arranged in the tail end pump stations (3), a liquid level meter (5) and a flow velocity meter (6) are arranged in the sewage main pipes (1), and the controllers (7) are respectively connected with the lifting pump sets (4), the liquid level meter (5) and the flow velocity meter (6) through signal transmission;
the control method comprises the following steps:
a. Reducing the existing running constant liquid level H Often times of the sewage pipe network coverage area and the surrounding urban rivers and lakes by 0.5-2m, so that the reduced running constant liquid level H' of the rivers and lakes is positioned below the pipe bottom elevation at the tail end of the sewage main pipe (1);
b. High water level operation of the non-sewage main pipe in the peak period: the method comprises the steps that during a non-sewage peak period, the operating flow of a lifting pump set (4) in a tail end pump set (3) is reduced through a controller (7), so that a sewage main pipe (1) and the tail end pump set (3) are in a high-water-level operating state, the operating power consumption of the lifting pump set (4) is reduced, and meanwhile, precipitation separation of particulate pollutants in sewage is carried out;
c. The sewage main pipe is operated at low water level in the peak period of sewage quantity: the operation flow of the lifting pump set (4) is increased through the controller (7) in the high-peak period of sewage, so that the sewage main pipe (1) and the tail end pump station (3) are in a low-water-level high-flow-rate operation state, and sediment formed by the high-water-level operation in the non-sewage high-peak period is flushed and separated from the sewage main pipe by the high-flow-rate sewage;
wherein steps b and c are cyclically alternated.
2. The cooperative control method for pollutant deposition and overflow of a sewage pipe network according to claim 1, wherein in the high water level operation state in the step b, the sewage flow rate is less than 0.6m/s, and the water depth h 1 in the sewage main pipe (1) is controlled to be (60% -75%) D;
In the low water level running state in the step c, the sewage flow rate is more than or equal to 0.6m/s, and the water depth h 2 in the sewage main pipe (1) is controlled to be (15% -40%) D;
Wherein D is the pipe diameter of the sewage main pipe (1).
3. The cooperative control method for pollutant deposition and overflow of a sewage pipe network according to claim 1, wherein in the step c, the peak period of sewage is two periods within 24 hours per day, namely 7:30-10:00 and 18:00-22:30 respectively;
in the step b, the non-sewage peak period is a period outside the sewage peak period.
4. The cooperative control method for pollutant deposition and overflow of the sewage pipe network according to claim 1, wherein in the step b, the non-sewage peak period sequentially comprises a transition section from a low water level to a high water level, a non-transition section and a transition section from a high water level to a low water level, the duration of the transition section is 0.5-1h, and the specific duration of the transition section is determined and regulated by the controller (7) through analysis by combining the actual control water depth h under the high water level and low water level operation state and the operation flow of the lifting pump set (4).
5. The cooperative control method for sewage pipe network pollutant deposition and overflow according to claim 4, wherein the controller (7) starts to increase the operation flow rate of the lifting pump set (4) at the beginning of the transition section from the high water level to the low water level, so that the operation water level of the sewage main pipe (1) is transited from the high water level to the low water level operation state required by the peak period of sewage at the end of the transition section;
The controller (7) starts to reduce the operation flow of the lifting pump set (4) at the beginning of the transition section from the low water level to the high water level, so that the operation water level of the sewage main pipe (1) is transited from the low water level to the high water level operation state required by the non-sewage peak period when the transition section is ended.
6. The cooperative control method for pollutant deposition and overflow of the sewage pipe network according to claim 1, wherein the input parameters of the controller (7) comprise control water depth under high and low water level operation states, real-time operation water level of the sewage main pipe (1) monitored by the liquid level meter (5), real-time sewage flow rate of the sewage main pipe (1) under the low water level operation state monitored by the flow velocity meter (6), design gradient and initial end pipe bottom elevation of the sewage main pipe (1), and distance from a setting point of the liquid level meter (5) to the initial end of the sewage main pipe (1);
and the controller (7) dynamically regulates and controls the real-time operation flow of the lifting pump set (4) according to the requirements of the sediment flushing separation of the sewage main pipe (1) on the sewage flow rate of more than or equal to 0.6m/s under the high and low water level operation states of the sewage main pipe (1).
7. The cooperative control method for pollutant deposition and overflow of a sewage pipe network according to claim 1, wherein the liquid level meter (5) is used for monitoring an actual running water level Z in the sewage main pipe (1) in real time, and is combined with an accounting of an actual water depth H of the sewage main pipe (1) and a control water depth range corresponding to a high water level running state and a low water level running state, and the controller (7) is guided in real time to dynamically regulate and control the running flow of the lifting pump set (4) and the variable water level running of the sewage main pipe (1), wherein the accounting formula of the actual water depth H of the sewage main pipe (1) is h=z-h+i, H is a pipe bottom elevation at the beginning end of the sewage main pipe (1) where the liquid level meter (5) is set, i is a gradient of the sewage main pipe (1), and L is a distance from the setting point of the liquid level meter (5) to the beginning end of the sewage main pipe (1).
8. The cooperative control method for pollutant deposition and overflow of the sewage pipe network according to claim 1, wherein the flow rate meter (6) is used for monitoring the actual flow rate of the sewage in the sewage main pipe (1) in a low water level operation state at a sewage peak period in real time, so that the controller (7) can analyze and judge whether the actual flow rate of the sewage meets the flow rate requirement that the flow rate of the sewage is more than or equal to 0.6m/s in the low water level operation state, and when the actual flow rate of the sewage is less than 0.6m/s in the low water level operation state, the controller (7) can regulate the operation flow rate of the lifting pump set (4) in real time, so that the operation water level of the sewage main pipe (1) is further reduced, and the actual flow rate of the sewage in the sewage main pipe (1) is more than or equal to 0.6m/s in the low water level operation state at the sewage peak period.
9. The sewage pipe network pollutant deposition and overflow cooperative control method according to claim 1, wherein the lifting pump set (4) is configured by adopting a combination of a large variable frequency pump and a small variable frequency pump, so that the controller (7) can dynamically and accurately regulate the real-time operation flow of the lifting pump set (4).
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