Source community sewage pollutant deposition-scouring cooperative control method and system

Abstract

The invention discloses a source community sewage pollutant deposition-washing cooperative control method and system, and the method comprises the following steps: S1, discharging domestic sewage discharged by residents from an inspection well, and recognizing a pipeline operation mode according to a community resident drainage time period inputted by a remote control center; s2, performing different drainage control according to different time periods; s3, in the operation process of the system, monitoring and early warning the sediment height and methane gas in the sediment control pool 1 in real time; and an operator on duty of the remote control center timely and accurately performs mode switching treatment in the step S2 according to early warning signals transmitted by the ultrasonic mud level meter and the infrared gas detector, or adopts related operation and maintenance strategies for dredging treatment. According to the method and the system, the operation modes of the sediment control pool and the sewage pipeline in different drainage periods are set, so that the pollutant deposition of the pipeline of the source community is reduced and the collection efficiency of the domestic sewage pollutants is improved while the initial interception and precipitation function of the septic tank is exerted.

Description

Technical Field

[0001] The present invention relates to the field of municipal drainage technology, and in particular to a method and system for coordinated control of pollutant deposition and flushing of sewage in a source community. Background Art

[0002] Sewage collection pipelines and septic tanks in source communities are key links in sewage collection and treatment facilities and are also weak links in urban sewage collection systems. Their operation and maintenance quality and management level directly determine the collection and treatment efficiency of domestic sewage pollutants. In recent years, with the continuous advancement of urban black and odorous water treatment and sewage treatment quality and efficiency improvement, the sewage collection efficiency of source communities and the operation and maintenance level of facilities such as pipelines and septic tanks have also received high attention. How to effectively control the deposition and consumption of pollutants at the source has become a hot topic of widespread concern in the industry.

[0003] Most cities in my country have septic tanks in residential areas. In actual operation, due to management problems such as unclear maintenance entities, septic tanks are often not cleaned in time and there is too much sediment at the bottom. The sediment layer in the septic tank is prone to anaerobic reactions, thereby producing a large amount of greenhouse gases such as methane. It is reported that among the 128 MtCO2-eq / a carbon emissions emitted in urban sewage systems, CH4 emissions from septic tanks account for 58.4%, which is the largest carbon emission source in the sewage system. In addition, the slow flow of liquid in the septic tank leads to local accumulation of feces and uneven reaction, which seriously affects the effluent water quality. Studies have found that the removal rates of COD and BOD5 in domestic sewage in some urban septic tanks are as high as 30%~70% and 20%~70%, which may lead to insufficient carbon sources for the influent of sewage treatment plants, which is not conducive to the efficient operation of the entire drainage system. Therefore, it may be a general trend to cancel or transform septic tanks.

[0004] However, it is worth noting that after the septic tank is directly cancelled, the solid sediment in the pipe will increase due to the lack of interception and sedimentation. At the same time, the flow rate of the source community pipeline network is generally low in most periods due to the randomness of residents' drainage behavior. The water volume also fluctuates greatly at different times of the day, which is insufficient to flush away feces, etc., which may cause blockage of the pipeline network and affect the normal discharge of sewage from drainage users. In addition, the internal pipeline network is prone to pollutant deposition under long-term low-flow rate operation conditions.

[0005] Therefore, how to solve the problem of sedimentation and blockage in existing residential sewage pipe networks has become a technical problem that needs to be urgently solved by people in this field. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a method and system for coordinated control of the deposition and flushing of sewage pollutants in source communities. By setting the operation modes of the sediment control pool and the sewage pipe at different drainage periods, while giving full play to the initial interception and sedimentation function of the septic tank, the deposition of pollutants in the source community pipes is reduced and the collection efficiency of domestic sewage pollutants is improved.

[0007] A method for coordinated control of pollutant deposition and flushing of sewage in a source area, comprising the following steps:

[0008] Step S1: Domestic sewage discharged by residents is discharged into the inspection well, and the pollutant deposition-flushing coordinated control system is started and operated, and the pipeline operation mode is identified according to the drainage period of the residents in the community input by the remote control center;

[0009] Step S2: Perform different drainage controls according to different time periods, including the following two modes:

[0010] S2A. When the residents' drainage enters the morning peak period, the system starts the sewage interception operation mode of the branch pipeline sediment control pool, closes the valve at the water inlet end of the sewage main pipeline, opens the valve at the water inlet end of the branch pipeline, and the domestic sewage flows out through the sediment control pool along the branch pipeline;

[0011] S2B. When the residents' drainage enters other periods, the system starts the main pipeline pollutant deposition-flushing operation mode, opens the valve at the water inlet end of the sewage main pipeline, and closes the valve at the water inlet end of the branch pipeline; if the water level h measured by the pressure level gauge in the flow rate control box is less than the maximum storage level H 水 , the flow control gate is closed, and the pipeline flow limiting mode is implemented until the liquid level is raised to H 水 After that, open the flow rate control gate and start the pipeline flushing mode;

[0012] Step S3: During the operation of the system, the sediment height and methane gas in the sediment control pool 1 are monitored and warned in real time; once the sediment height h in the pool is greater than the sediment excess height H 泥 Or the methane content c is greater than the methane gas excess concentration C 气 The on-duty personnel of the remote control center will promptly and accurately switch the mode of step S2 or adopt relevant operation and maintenance strategies to clear the problem according to the warning signals sent by the ultrasonic mud level meter and infrared gas detector.

[0013] Preferably, the morning peak period for residential drainage in step S2A is 6:00-10:00 within 24 hours every day; in step S2B, other periods for residential drainage are the periods other than the morning peak period within 24 hours every day, and the two periods correspond to two pipeline operation modes respectively.

[0014] Preferably, the maximum storage liquid level H of the flow rate control box in step S2B 水It is determined based on the difference between the top elevation of the inspection well with the lowest elevation and the bottom elevation of the water outlet end of the flow rate control box within the upstream pipe section from the installation point to the residential emission source in the system;

[0015] The flow rate control box in step S2B is arranged at the downstream position of the sewage drainage system of the community. The maximum storage liquid level H of the flow rate control box 水 <The lowest inspection well top elevation - the bottom elevation of the water outlet end of the flow rate control box;

[0016] The sediment exceeding standard height H of the sediment control pool in step S3 泥 The excess methane concentration C is determined by the difference between the top elevation of the pipe at the water inlet end of the control pool and the bottom elevation of the pool. 气 Set at 5%, each control parameter threshold is input to the remote control center before the system is operated.

[0017] Preferably, the diameter of the flow rate control gate in the pipeline flow limiting mode and the flushing mode in step S2B is set to be equal to the downstream pipeline diameter, and the gate opening range is adjusted by the remote control center within the range of fully closed to fully open.

[0018] Preferably, in step S3, after the sediment height monitored by the ultrasonic mud level meter in the sediment control pool exceeds the top of the water inlet pipe, the remote control center receives a clearing warning signal and immediately adopts relevant operation and maintenance strategies to avoid solidified materials blocking the pipe.

[0019] Preferably, in step S3, after the infrared gas detector detects that the methane concentration exceeds 5%, the connected alarm speaker is activated to remind residents not to approach the danger to prevent methane gas from endangering personal safety.

[0020] A control system used in a coordinated control method for sedimentation and flushing of sewage pollutants in a source community comprises an upstream inspection well, a sewage main pipe connected to the inspection well, and a sewage branch pipe connected in parallel to the sewage main pipe; a switching valve is provided at the connection between the water inlet ends of the sewage main pipe and the sewage branch pipe; a flow rate control box is provided on the sewage main pipe to perform temporary throttling of the sewage main pipe and pipeline flushing control by opening the gate to release water; a sediment control pool remotely controlled by a remote control center is provided on the sewage branch pipe; the switching valve switches the single connection relationship between the sewage main pipe and the sewage branch pipe and the upstream pipeline according to the time period.

[0021] Preferably, the switching valve includes a valve at the water inlet end of the sewage main pipe and a valve at the water inlet end of the branch pipe, wherein the valve at the water inlet end of the branch pipe is arranged at the water inlet end of the sewage branch pipe, and the valve at the water inlet end of the sewage main pipe is arranged in the sewage main pipe downstream of the valve at the water inlet end of the branch pipe.

[0022] Preferably, the flow rate control box is connected in series to the sewage main pipe, the top of the flow rate control box extends upward and is provided with a cavity for temporarily storing sewage inside, and a pressure level gauge and a flow rate control gate are provided at the drain outlet of the flow rate control box to adjust the opening of the flow rate control gate according to the sewage flow rate in the sewage main pipe.

[0023] Preferably, an infrared gas detector and an alarm speaker are provided on the top of the sediment control pool, both sides of the middle of the sediment control pool are connected to the sewage branch pipes, and an ultrasonic mud level meter is fixedly provided on the side wall of the drainage end of the sediment control pool.

[0024] The advantages and technical effects of the present invention are:

[0025] 1. The present invention adopts a fully automatic operation mode, and realizes functions such as control parameter setting, sewage pipe operation mode control, sediment control pool cleaning, methane exceeding standard warning and strategy implementation through the remote control center, so as to improve the intelligence level of community pipeline operation and maintenance management and ensure the timeliness and accuracy of operation and maintenance control.

[0026] 2. The present invention is based on the discharge law of pollutants deposited in the sewage pipe network of the source community. By setting pipeline gate valves and their opening and closing processes, it innovatively adopts the sediment control pool to intercept pollutants during the peak period of discharge and the sewage pipe deposition-flushing operation mode during the non-peak period. While giving full play to the initial interception and sedimentation function of the septic tank, it effectively reduces the deposition of pollutants in the source community pipes and improves the centralized collection efficiency of domestic sewage pollutants.

[0027] 3. In order to solve the difficult problems such as the long-term low flow rate operation of the source sewage pipe network, the present invention uses a flow rate control box to limit the flow and intercept sewage, and utilizes the larger flow rate formed by the instantaneous discharge of stored sewage to flush the easily deposited pollutants into the municipal pipe network along with a large amount of water flow, thereby reducing the deposition problem caused by the lower flow rate during the emission trough period, reducing the consumption of carbon sources in the source sewage transportation process, and helping to improve the operation efficiency of the pipe network.

[0028] 4. The present invention can be directly implemented after modification on the basis of existing septic tanks. It is simple and convenient to operate and has strong operability. It can provide new ideas for the cancellation or modification of septic tanks in my country, and provide technical support for improving the efficiency of pollutant collection in pipelines and optimizing the actual operation mode of pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the system connection of the pipe network control in the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure (showing the water level H in the flow rate control box 水 The water level in the flow control box must be lower than H 水 To prevent sewage from escaping from the well mouth);

[0031] Figure 3 It is a schematic diagram of the internal structure of the flow rate control box in the present invention;

[0032] Figure 4 It is a schematic diagram of the internal structure of the sediment control pool in the present invention;

[0033] In the figure: 1-sediment control tank; 2-flow rate control box; 3-ultrasonic mud level meter; 4-infrared gas detector; 5-alarm speaker; 6-pressure level gauge; 7-flow rate control gate; 8-remote control center; 9-sewage branch pipe; 10-branch pipe water inlet valve; 11-sewage main pipe; 12-sewage main pipe water inlet valve; 13-upstream inspection well; 14-exhaust hole; 15-fixing buckle. DETAILED DESCRIPTION

[0034] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings. It should be noted that the embodiments are illustrative, not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0035] A method for coordinated control of pollutant deposition and flushing of sewage in a source area of ​​the present invention comprises the following steps:

[0036] Step S1: Domestic sewage discharged by residents is discharged into the inspection well 13, and the pollutant deposition-flushing coordinated control system is started to operate, and the pipeline operation mode is identified according to the drainage period of the community residents input by the remote control center 8;

[0037] Step S2: Perform different drainage controls according to different time periods, including the following two modes:

[0038] S2A. When the residents' drainage enters the morning peak period, the system starts the branch pipeline sediment control tank sewage interception operation mode, closes the valve 12 at the water inlet end of the sewage main pipeline, opens the valve 10 at the water inlet end of the branch pipeline, and the domestic sewage flows out through the sediment control tank 1 along the branch pipeline 9;

[0039] S2B. When the residents' drainage enters other periods, the system starts the main pipeline pollutant deposition-flushing operation mode, opens the valve at the water inlet end of the sewage main pipeline, and closes the valve at the water inlet end of the branch pipeline; if the water level h measured by the pressure level gauge 6 in the flow rate control box is less than the maximum storage level H 水 , the flow control gate 7 is closed, and the pipeline flow limiting mode is implemented until the liquid level is raised to H 水 After that, open the flow rate control gate 7 and start the pipeline flushing mode;

[0040] Step S3: During the operation of the system, the sediment height and methane gas in the sediment control pool 1 are monitored and warned in real time; once the sediment height h in the pool is greater than the excessive sediment height H or the methane content c is greater than the excessive methane gas concentration C, the on-duty personnel of the remote control center 8 will make the mode switching process of step S2 in a timely and accurate manner according to the warning signals transmitted by the ultrasonic mud level meter 3 and the infrared gas detector 4, or adopt relevant operation and maintenance strategies for dredging.

[0041] Preferably, the morning peak period for residential drainage in step S2A is 6:00-10:00 within 24 hours every day; in step S2B, other periods for residential drainage are the periods other than the morning peak period within 24 hours every day, and the two periods correspond to two pipeline operation modes respectively.

[0042] Preferably, the maximum storage liquid level H of the flow rate control box in step S2B 水 It is determined based on the difference between the top elevation of the inspection well with the lowest elevation and the bottom elevation of the water outlet end of the flow rate control box within the upstream pipe section from the installation point to the residential emission source in the system;

[0043] The sediment exceeding standard height H of the sediment control pool in step S3 泥 The excess methane concentration C is determined by the difference between the top elevation of the pipe at the water inlet end of the control pool and the bottom elevation of the pool. 气 Set at 5%, each control parameter threshold is input to the remote control center 8 before the system is operated.

[0044] Preferably, the diameter of the flow rate control gate 7 in the pipeline flow limiting mode and the flushing mode in step S2B is set to be equal to the downstream pipeline diameter, and the gate opening range is adjusted by the remote control center 8 within the range of fully closed to fully open.

[0045] Preferably, after the sediment height monitored by the ultrasonic mud level meter 3 in the sediment control pool in step S3 exceeds the top of the water inlet pipe, the remote control center 8 receives a clearing warning signal and immediately adopts relevant operation and maintenance strategies to avoid solidified materials blocking the pipe.

[0046] Preferably, in step S3, after the infrared gas detector 4 detects that the methane concentration exceeds 5%, the connected alarm speaker 5 is activated to remind residents not to approach the danger to prevent the methane gas from endangering personal safety.

[0047] A control system used in a coordinated control method for sedimentation and flushing of sewage pollutants in a source community comprises an upstream inspection well, a sewage main pipe connected to the inspection well, and a sewage branch pipe connected in parallel to the sewage main pipe; a switching valve is provided at the connection between the water inlet ends of the sewage main pipe and the sewage branch pipe; a flow rate control box is provided on the sewage main pipe to perform temporary throttling of the sewage main pipe and pipeline flushing control by opening the gate to release water; a sediment control pool remotely controlled by a remote control center is provided on the sewage branch pipe; the switching valve switches the single connection relationship between the sewage main pipe and the sewage branch pipe and the upstream pipeline according to the time period.

[0048] Preferably, the switching valve includes a sewage main pipe water inlet valve and a branch pipe water inlet valve 10, wherein the branch pipe water inlet valve is arranged at the water inlet end of the sewage branch pipe, and the sewage main pipe water inlet valve is arranged in the sewage main pipe downstream of the branch pipe water inlet valve.

[0049] Preferably, the flow rate control box is connected in series to the sewage main pipe, the top of the flow rate control box extends upward and is provided with a cavity for temporarily storing sewage inside, and a pressure level gauge and a flow rate control gate are provided at the drain outlet of the flow rate control box to adjust the opening of the flow rate control gate according to the sewage flow rate in the sewage main pipe.

[0050] Preferably, an infrared gas detector and an alarm speaker are provided on the top of the sediment control pool, both sides of the middle of the sediment control pool are connected to the sewage branch pipes, and an ultrasonic mud level meter is fixedly provided on the side wall of the drainage end of the sediment control pool.

[0051] In addition, in the present invention, preferably, the pressure level gauge is fixed on the vertical side wall of the flow rate control box by means of a fixing buckle 15 ; and the infrared gas detector is fixed on the top of the sediment control tank by means of the same fixing buckle 15 .

[0052] In addition, in the present invention, preferably, a vent hole 14 is provided on the top of the sediment control pool to prevent the accumulation of combustible gas.

[0053] In order to more clearly illustrate the specific implementation mode of the present invention, an embodiment is provided below:

[0054] The present invention provides a method and system for coordinated control of pollutant deposition and flushing in source residential sewage, and the implementation mode is as follows:

[0055] 1. The present invention can adjust the drainage during the morning peak hours and other periods according to the water usage patterns of building residents;

[0056] 2. Before the implementation of the present invention, it is necessary to collect the data of the community pipe network, and find the inspection well with the lowest elevation in the system according to the elevation data of each inspection well, such as Figure 2As shown, the pipe network system should be laid downstream of the lowest inspection well in the community, and the highest water level should not be higher than the wellhead of the lowest inspection well;

[0057] 3. The volume of the sediment control tank should be appropriately reduced based on the volume of the existing septic tank to shorten the hydraulic retention time and control sedimentation;

[0058] 4. The pipe network system starts the sewage interception operation mode of the branch pipe sediment control tank during the morning peak period of drainage. The sewage flows out through the sediment control tank along the branch pipe to ensure the deposition of large particles in the feces. The main pipe pollutant deposition-flushing operation mode is started at other times. All controls are operated by the remote monitoring center, which receives signals from ultrasonic mud level meters, infrared gas detectors, alarm speakers and pressure level meters to remotely control the flow control gate, the valve at the water inlet end of the sewage main pipe and the valve at the water inlet end of the branch pipe.

[0059] 6. In order to achieve large-flow and high-velocity flushing of sewage, consider appropriately increasing the slope and diameter of the pipe network. You can refer to the "Outdoor Drainage Design Standard" (GB50014-2021). The diameter of the sewage pipe should not be less than 300mm, and the corresponding minimum slope should not be less than 0.3%; the flow rate of the sewage pipe should not be less than 0.6m / s at the designed fullness.

[0060] 7. Once the remote control center receives a warning signal that the sediment height or methane gas content in the sediment control pool exceeds the standard, it must take timely and accurate measures to avoid solidified materials blocking the pipeline and methane gas endangering personal safety.

[0061] Finally, all the parts not described in the present invention adopt mature products and mature technical means in the prior art.

[0062] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for coordinated control of pollutant deposition and flushing of sewage in source areas, characterized in that: The following steps are involved: Step S1: Domestic sewage discharged by residents is discharged into the inspection well (13), and the pollutant deposition-flushing coordinated control system is started to operate, and the pipeline operation mode is identified according to the drainage period of the residents in the community input by the remote control center (8); Step S2: Perform different drainage controls according to different time periods, including the following two modes: S2A. When the residents' drainage enters the morning peak period, the system starts the branch pipeline sediment control tank sewage interception operation mode, closes the valve (12) at the water inlet end of the sewage main pipeline, opens the valve (10) at the water inlet end of the branch pipeline, and the domestic sewage flows out through the sediment control tank (1) along the branch pipeline (9); S2B. When the residents' drainage enters other periods, the system starts the main pipeline pollutant deposition-flushing operation mode, opens the valve (12) at the water inlet end of the sewage main pipeline, and closes the valve (10) at the water inlet end of the branch pipeline; if the water level h measured by the pressure level gauge (6) in the flow rate control box is less than the maximum storage level H 水 , the flow control gate (7) is closed, and the pipeline flow limiting mode is implemented until the liquid level is raised to H 水 Then, open the flow rate control gate (7) to start the pipeline flushing mode; Step S3: During the operation of the system, the sediment height and methane gas in the sediment control pool (1) are monitored and warned in real time; once the sediment height h in the pool is greater than the sediment excess height H 泥 Or the methane content c is greater than the methane gas excess concentration C 气 The on-duty personnel of the remote control center (8) promptly and accurately switch the mode of step S2 or adopt relevant operation and maintenance strategies to clear the problem according to the warning signals transmitted by the ultrasonic mud level meter (3) and the infrared gas detector (4).

2. The method for coordinated control of pollutant deposition and flushing of sewage in source areas according to claim 1 is characterized by: The morning peak period for residential drainage in step S2A is 6:00-10:00 within 24 hours every day; in step S2B, other periods for residential drainage are the periods other than the morning peak period within 24 hours every day, and the two periods correspond to two pipeline operation modes respectively.

3. The method for coordinated control of pollutant deposition and flushing of sewage in source areas according to claim 1 is characterized by: The flow rate control box in step S2B is arranged at the downstream position of the sewage drainage system of the community. The maximum storage liquid level H of the flow rate control box 水 <The lowest inspection well top elevation - the bottom elevation of the water outlet end of the flow rate control box; The sediment exceeding standard height H of the sediment control pool in step S3 泥 The excess methane concentration C is determined by the difference between the top elevation of the pipe at the water inlet end of the control pool and the bottom elevation of the pool. 气 Set at 5%, each control parameter threshold is input to the remote control center (8) before the system is operated.

4. The method for coordinated control of pollutant deposition and flushing of sewage in source areas according to claim 1 is characterized by: The diameter of the flow rate control gate (7) in the pipeline flow limiting mode and flushing mode in step S2B is set to be equal to the downstream pipeline diameter, and the gate opening range is adjusted by the remote control center (8) within the range of fully closed to fully open.

5. The method for coordinated control of pollutant deposition and flushing of sewage in source areas according to claim 1 is characterized by: When the sediment height detected by the ultrasonic mud level meter (3) in the sediment control pool in step S3 exceeds the top of the water inlet pipe, the remote control center (8) receives a clearing warning signal and immediately adopts relevant operation and maintenance strategies to prevent the solidified matter from clogging the pipe.

6. The method for coordinated control of pollutant deposition and flushing of sewage in source areas according to claim 1 is characterized by: In step S3, after the infrared gas detector (4) detects that the methane concentration exceeds 5%, the connected alarm speaker (5) is activated to remind residents not to approach the danger to prevent the methane gas from endangering personal safety.

7. A control system used in the source area sewage pollutant deposition-scouring coordinated control method as claimed in claim 1, comprising an upstream inspection well and a sewage main pipe connected to the inspection well, characterized in that: It also includes a sewage branch pipeline connected in parallel to the sewage main pipeline; a switching valve is provided at the connection between the water inlet ends of the sewage main pipeline and the sewage branch pipeline; a flow rate control box is provided on the sewage main pipeline to perform temporary throttling of the sewage main pipeline and pipeline flushing control by opening the gate to release water; a sediment control pool remotely controlled by a remote control center is provided on the sewage branch pipeline; the switching valve switches the single connection relationship between the sewage main pipeline and the sewage branch pipeline and the upstream pipeline according to the time period.

8. The control system used in the coordinated control method for the deposition and flushing of pollutants in sewage from source areas according to claim 7 is characterized by: The switching valve includes a valve at the water inlet end of the sewage main pipe and a valve at the water inlet end of the branch pipe, wherein the valve at the water inlet end of the branch pipe is arranged at the water inlet end of the sewage branch pipe, and the valve at the water inlet end of the sewage main pipe is arranged in the sewage main pipe downstream of the valve at the water inlet end of the branch pipe.

9. The control system used in the coordinated control method for the deposition and flushing of pollutants in sewage from source areas according to claim 7 is characterized by: The flow rate control box is connected in series to the sewage main pipeline. The top of the flow rate control box extends upward and is provided with a cavity for temporarily storing sewage inside. A pressure level gauge and a flow rate control gate are provided at the drain outlet of the flow rate control box to adjust the opening of the flow rate control gate according to the sewage flow rate in the sewage main pipeline.

10. The control system used in the coordinated control method for the deposition and flushing of pollutants in sewage from source areas according to claim 7 is characterized by: An infrared gas detector and an alarm speaker are arranged on the top of the sediment control pool. The two sides of the middle of the sediment control pool are connected to the sewage branch pipeline, and an ultrasonic mud level meter is fixedly arranged on the side wall of the drainage end of the sediment control pool.

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