A source cell sewage pollutant deposition-erosion collaborative control method and system

Abstract

This invention discloses a method and system for coordinated control of pollutant deposition and flushing in sewage from a residential community, comprising the following steps: Step S1: Domestic sewage discharged by residents is discharged into the pipeline through an inspection well, and the pipeline operation mode is identified based on the drainage time period of the residents input by the remote control center; Step S2: Different drainage controls are implemented according to different time periods; Step S3: During system operation, the sediment height and methane gas in the sediment control tank 1 are monitored and warned in real time; the on-duty personnel at the remote control center promptly and accurately switch the mode in step S2 or take relevant operation and maintenance strategies to dredge the pipes based on the warning signals transmitted by the ultrasonic sludge level gauge and the infrared gas detector. This method and system, by setting the operation modes of the sediment control tank and sewage pipelines for different drainage time periods, reduces pollutant deposition in the pipelines of the residential community from the source and improves the collection efficiency of domestic sewage pollutants while leveraging the initial interception and sedimentation function of the septic tank.

Description

Technical Field

[0001] This invention relates to the field of municipal drainage technology, specifically to a method and system for the coordinated control of pollutant deposition and flushing in sewage from residential areas. Background Technology

[0002] Sewage collection pipelines and septic tanks in residential communities are key components of sewage collection and treatment facilities, but also weak links in urban sewage collection systems. Their operation and maintenance quality and management level directly determine the efficiency of domestic sewage collection and treatment. In recent years, with the continuous advancement of urban black and odorous water body treatment and the improvement of sewage treatment efficiency, the sewage collection efficiency in residential communities and the operation and maintenance level of facilities such as pipe networks and septic tanks have 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 communities. However, due to unclear maintenance responsibilities and other management issues, these tanks are often not cleaned in a timely manner, leading to excessive sediment buildup at the bottom. The sediment layer within septic tanks easily undergoes anaerobic reactions, producing large amounts of greenhouse gases such as methane. Reports indicate that septic tanks account for 58.4% of the 128 MtCO2-eq / a carbon emissions from urban sewage systems, making them the largest carbon source. Furthermore, the slow flow of liquid within septic tanks leads to localized accumulation of feces, resulting in uneven reactions and severely impacting effluent quality. Studies have found that some urban septic tanks achieve COD removal rates of 30%–70% and BOD5 removal rates of 20%–70% in domestic sewage, potentially leading to insufficient carbon sources in the influent of sewage treatment plants and hindering the efficient operation of the entire drainage system. Therefore, eliminating or upgrading septic tanks is an inevitable trend.

[0004] However, it is worth noting that after directly eliminating septic tanks, the amount of solid sediment that can be deposited in the pipes increases due to the lack of interception and sedimentation. At the same time, the flow velocity in the source community pipe network is generally low at most times due to the randomness of residents' drainage behavior, and the water volume also fluctuates greatly at different times of the day, which is insufficient to flush away feces and other waste. This may cause pipe network blockage, affecting the normal discharge of sewage from drainage users. Furthermore, pollutants are prone to accumulate in the internal pipe network under long-term low flow velocity conditions.

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

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and system for coordinated control of pollutant deposition and flushing in sewage at the source of a residential community. By setting up a sediment control tank and different operating modes for different drainage periods of the sewage pipeline, the method can reduce pollutant deposition in the pipeline at the source of the community and improve the collection efficiency of domestic sewage pollutants while giving full play to the initial interception and sedimentation function of the septic tank.

[0007] A method for coordinated control of pollutant deposition and flushing in sewage from source-type residential areas includes the following steps:

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

[0009] Step S2: Implement different drainage controls based on different time periods, including the following two modes:

[0010] S2A. When residents' drainage enters the morning peak period, the system activates the interception operation mode of the sediment control tank in the branch pipeline, closes the inlet valve of the main sewage pipeline, and opens the inlet valve of the branch pipeline, so that domestic sewage flows out through the sediment control tank along the branch pipeline.

[0011] S2B. When residential drainage enters other time periods, the system activates the main pipeline pollutant sedimentation-flushing operation mode, opens the inlet valve of the main sewage pipeline, and closes the inlet valve 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 rate control gate is closed, and the pipeline flow restriction mode is implemented until the liquid level rises to H. 水 Then, open the flow rate control gate to start the pipeline flushing mode;

[0012] Step S3: During system operation, the sediment height and methane gas levels in sediment control pool 1 are monitored and alerted in real time; once the sediment height h in the pool exceeds the sediment exceedance height H... 泥 Or the methane content c is greater than the methane gas concentration exceeding the standard C. 气 Based on the warning signals transmitted by the ultrasonic mud level gauge and the infrared gas detector, the on-duty personnel at the remote control center can promptly and accurately perform the mode switching process in step S2, or take relevant operation and maintenance strategies to clear the blockage.

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

[0014] Preferably, the maximum storage level H of the flow rate control tank in step S2B is... 水The elevation difference between the top elevation of the lowest manhole and the bottom elevation of the outlet of the flow velocity control box is determined based on the upstream pipe section from the installation point to the resident's discharge source in the system.

[0015] The flow rate control box in step S2B is located downstream of the community's sewage drainage system. The maximum storage level H of the flow rate control box is... 水 <Lowest inspection well top elevation - bottom elevation of the flow velocity control box outlet;

[0016] The sediment exceedance height H in the sediment control pond in step S3 泥 The concentration of methane gas exceeding the standard, C, is determined based on the difference between the elevation of the top of the pipe at the inlet end of the control tank and the elevation of the bottom of the tank. 气 The threshold for each control parameter is set at 5%, and is entered into the remote control center before the system is run.

[0017] Preferably, in step S2B, the diameter of the flow control gate in the pipeline flow restriction mode and the flushing mode is set to be equal to the diameter of the downstream pipeline, 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 ultrasonic mud level gauge in the sediment control tank detects that the sediment height exceeds the top of the inlet pipe, the remote control center receives a cleaning warning signal and immediately takes relevant operation and maintenance strategies to prevent solids from clogging 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 to stay away from the danger and prevent methane gas from endangering their personal safety.

[0020] A control system used in a source-based community sewage pollutant sedimentation-flushing coordinated control method includes an upstream inspection well, a main sewage pipeline connected to the inspection well, and a sewage branch pipeline connected in parallel to the main sewage pipeline. A switching valve is installed at the inlet connection between the main sewage pipeline and the sewage branch pipeline. A flow rate control box is installed on the main sewage pipeline for temporary throttling and flushing control of the main sewage pipeline. A sediment control pool remotely controlled by a remote control center is installed on the sewage branch pipeline. The switching valve switches the single connection relationship between the main sewage pipeline, the sewage branch pipeline, and the upstream pipeline according to time periods.

[0021] Preferably, the switching valves include a main sewage pipeline inlet valve and a branch pipeline inlet valve, wherein the branch pipeline inlet valve is installed at the inlet end of the sewage branch pipeline, and the main sewage pipeline inlet valve is installed in the main sewage pipeline downstream of the branch pipeline inlet valve.

[0022] Preferably, the flow rate control box is connected in series with the main sewage pipeline. The top of the flow rate control box extends upward and has an internal cavity for temporarily storing sewage. A pressure level gauge and a flow rate control gate are installed 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 main sewage pipeline.

[0023] Preferably, the top of the sediment control tank is equipped with an infrared gas detector and an alarm speaker, the middle two sides of the sediment control tank are connected to sewage branch pipes, and an ultrasonic mud level gauge is fixed on the side wall of the drainage end of the sediment control tank.

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

[0025] 1. This invention adopts a fully automatic operation mode, and realizes functions such as setting control parameters, controlling the operation mode of sewage pipelines, cleaning sediment control tanks, and early warning and strategy implementation for methane exceeding standards through a remote control center, thereby improving the intelligence level of community pipeline operation and maintenance management and ensuring the timeliness and accuracy of operation and maintenance management.

[0026] 2. Based on the emission patterns of pollutants deposited in the sewage pipe network of the source community, this invention innovatively adopts a sediment control pool interception during peak discharge periods and a sewage pipe sedimentation-flushing operation mode during off-peak periods by setting up pipe gate valves and their opening and closing processes. While giving full play to the initial interception and sedimentation function of septic tanks, it effectively reduces the deposition of pollutants in the source community pipe network and improves the efficiency of centralized collection of domestic sewage pollutants.

[0027] 3. This invention addresses the challenges of long-term low-flow-rate operation of sewage pipe networks at the source. It utilizes a flow rate control box to limit and intercept sewage, and leverages the high flow rate generated by the instantaneous discharge of stored sewage to flush easily deposited pollutants into the municipal pipe network along with a large volume of water. This reduces sedimentation problems caused by low flow rates during discharge off-peak periods, lowers carbon source consumption during the sewage transport process at the source, and helps improve the operational efficiency of the pipe network.

[0028] 4. This invention can be implemented directly by modifying existing septic tanks. It is simple and convenient to operate and has strong operability. It can provide new ideas for the cancellation or renovation of septic tanks in my country and provide technical support for improving the efficiency of pollutant collection in pipe networks and optimizing the actual operation mode of pipe networks. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the system connectivity for pipeline network control in this invention;

[0030] Figure 2 for Figure 1 A three-dimensional structural diagram (showing the water level H inside the flow rate control box) 水 In relation to the position of the top of the upstream inspection well, the water level in the flow velocity control box must be lower than H. 水 (To prevent sewage from overflowing at the manhole opening)

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

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

[0033] In the diagram: 1-Sediment control tank; 2-Flow rate control box; 3-Ultrasonic sludge level gauge; 4-Infrared gas detector; 5-Alarm speaker; 6-Pressure level gauge; 7-Flow rate control gate; 8-Remote control center; 9-Branch sewage pipeline; 10-Branch pipeline inlet valve; 11-Main sewage pipeline; 12-Main sewage pipeline inlet valve; 13-Upstream inspection well; 14-Ventilation vent; 15-Fixing buckle. Detailed Implementation

[0034] To further understand the content, features, and effects of this invention, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings. It should be noted that these embodiments are descriptive, not limiting, and should not be construed as limiting the scope of protection of this invention.

[0035] The present invention provides a method for coordinated control of pollutant deposition and flushing in sewage from source-level communities, comprising the following steps:

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

[0037] Step S2: Implement different drainage controls based on different time periods, including the following two modes:

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

[0039] S2B. When residential drainage enters other time periods, the system activates the main pipeline pollutant sedimentation-flushing operation mode, opens the inlet valve of the main sewage pipeline, and closes the inlet valve 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 rate control gate 7 is closed, and the pipeline flow restriction mode is implemented until the liquid level rises to H. 水 Then, open the flow rate control gate 7 to start the pipeline flushing mode;

[0040] Step S3: During system operation, 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 exceeds the sediment exceedance height H_mud or the methane content c exceeds the methane gas exceedance concentration C_gas, the on-duty personnel at the remote control center 8 will promptly and accurately perform the mode switching process in step S2 based on the warning signals transmitted by the ultrasonic mud level gauge 3 and the infrared gas detector 4, or take relevant operation and maintenance strategies to clear the blockage.

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

[0042] Preferably, the maximum storage level H of the flow rate control tank in step S2B is... 水 The elevation difference between the top elevation of the lowest manhole and the bottom elevation of the outlet of the flow velocity control box is determined based on the upstream pipe section from the installation point to the resident's discharge source in the system.

[0043] The sediment exceedance height H in the sediment control pond in step S3 泥 The concentration of methane gas exceeding the standard, C, is determined based on the difference between the elevation of the top of the pipe at the inlet end of the control tank and the elevation of the bottom of the tank. 气 The threshold for each control parameter is set at 5% and is entered into the remote control center before the system runs.

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

[0045] Preferably, in step S3, after the ultrasonic mud level gauge 3 in the sediment control tank detects that the sediment height exceeds the top of the inlet pipe, the remote control center 8 receives a cleaning warning signal and immediately takes relevant operation and maintenance strategies to prevent solids from clogging 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 to stay away from the danger and prevent methane gas from endangering their personal safety.

[0047] A control system used in a source-based community sewage pollutant sedimentation-flushing coordinated control method includes an upstream inspection well, a main sewage pipeline connected to the inspection well, and a sewage branch pipeline connected in parallel to the main sewage pipeline. A switching valve is installed at the inlet connection between the main sewage pipeline and the sewage branch pipeline. A flow rate control box is installed on the main sewage pipeline for temporary throttling and flushing control of the main sewage pipeline. A sediment control pool remotely controlled by a remote control center is installed on the sewage branch pipeline. The switching valve switches the single connection relationship between the main sewage pipeline, the sewage branch pipeline, and the upstream pipeline according to time periods.

[0048] Preferably, the switching valves include a main sewage pipeline inlet valve and a branch pipeline inlet valve 10, wherein the branch pipeline inlet valve is installed at the inlet end of the sewage branch pipeline, and the main sewage pipeline inlet valve is installed in the main sewage pipeline downstream of the branch pipeline inlet valve.

[0049] Preferably, the flow rate control box is connected in series with the main sewage pipeline. The top of the flow rate control box extends upward and has an internal cavity for temporarily storing sewage. A pressure level gauge and a flow rate control gate are installed 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 main sewage pipeline.

[0050] Preferably, the top of the sediment control tank is equipped with an infrared gas detector and an alarm speaker, the middle two sides of the sediment control tank are connected to sewage branch pipes, and an ultrasonic mud level gauge is fixed on the side wall of the drainage end of the sediment control tank.

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

[0052] In addition, preferably, the sediment control tank of the present invention has an exhaust hole 14 at the top to prevent the accumulation of combustible gases.

[0053] To more clearly illustrate the specific embodiments of the present invention, an example is provided below:

[0054] The present invention provides a source-based community sewage pollutant deposition-flushing synergistic control method and system, the implementation mode of which is as follows:

[0055] 1. This invention can adjust the drainage peak hours and other times according to the different water usage patterns of building residents;

[0056] 2. Before implementing this invention, it is necessary to collect information on the community's pipe network and find the manhole with the lowest elevation in the system based on the elevation data of each manhole. Figure 2As shown, the pipeline system should be laid downstream of the lowest manhole in the community, and the highest water level should not be higher than the opening of the lowest manhole.

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

[0058] 4. During the morning peak drainage period, the pipeline system will activate the sediment control tank interception mode for branch pipelines. Sewage will flow out through the sediment control tank along the branch pipelines to ensure the sedimentation of large particles in the feces. At other times, the main pipeline will activate the pollutant sedimentation-flushing mode. All controls are operated at the remote monitoring center, which receives signals from the ultrasonic sludge level gauge, infrared gas detector, alarm speaker, and pressure level gauge to remotely control the flow rate control gate, the inlet valve of the main sewage pipeline, and the inlet valve of the branch pipeline.

[0059] 6. To achieve high flow rate and high velocity flushing of sewage, the slope and diameter of the pipe network should be appropriately increased. The "Outdoor Drainage Design Standard" (GB50014-2021) can be referenced. The diameter of sewage pipes should not be less than 300mm, and the corresponding minimum slope should not be less than 0.3%. The flow velocity of sewage pipes should not be less than 0.6m / s under the design fullness.

[0060] 7. Once the remote control center receives an early warning signal that the sediment level or methane gas content in the sediment control pool exceeds the standard, it must take timely and accurate action to prevent solidified material from clogging the pipes and methane gas from endangering personal safety.

[0061] Finally, any parts of this invention not described herein utilize existing mature products and technologies.

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

Claims

1. A method for source cell sewage pollution deposition-erosion synergistic control, characterized in that, The method comprises the following steps: Step S1: domestic sewage discharged by residents is discharged by the inspection well (13), and the pollution deposition-flushing collaborative control system is started to operate, and the pipeline operation mode is identified according to the resident drainage time period input by the remote control center (8); Step S2: different drainage controls are performed according to different time periods, including the following two modes: S2A. When the resident drainage enters the early morning peak period, the system starts the branch pipeline sediment control pool sewage interception operation mode, closes the sewage main pipeline inlet valve (12), and opens the branch pipeline inlet valve (10), so that the domestic sewage flows out along the branch pipeline (9) through the sediment control pool (1); S2B. When the resident drainage enters other time period, the system starts the main pipeline pollutant deposition-flushing mode, opens the sewage main pipeline inlet valve (12), and closes the branch pipeline inlet valve (10); if the water level h measured by the pressure type liquid level meter (6) in the flow rate control box is less than the maximum storage liquid level H 水 , the flow rate control gate (7) is closed, the pipeline flow limiting mode is implemented, and after the liquid level is raised to H 水 , the flow rate control gate (7) is opened, and the pipeline flushing mode is started; Step S3: During the operation of the system, the height of the sediment and the methane gas in the sediment control pool (1) are monitored in real time; once the height of the sediment in the pool h is greater than the excessive height of the sediment H 泥 or the methane content c is greater than the excessive concentration of methane gas C 气 , the on-duty personnel of the remote control center (8) will make timely and accurate mode switching processing of step S2 or take related operation and maintenance strategies to dredge according to the early warning signals transmitted by the ultrasonic mud level meter (3) and the infrared gas detection meter (4).

2. The source cell wastewater pollutant deposition-erosion synergic control method according to claim 1, characterized in that: The resident drainage early morning peak period in the step S2A is 6:00-10:00 in 24 hours per day; the resident drainage other time period in the step S2B is the time period other than the early morning peak period in 24 hours per day, and the two time periods correspond to two pipeline operation modes respectively.

3. The source community sewage pollution deposition-flushing collaborative control method according to claim 1, characterized in that: The flow rate control box in the step S2B is arranged at a downstream position of the small-area sewage drainage system, and the maximum storage liquid level H of the flow rate control box is higher than the lowest inspection well top elevation 水 The lowest inspection well top elevation-flow rate control box water outlet bottom elevation The sediment over-standard height H of the sediment control pool in step S3 泥 The methane gas over-standard concentration C is determined according to the difference between the pipe top elevation where the control pool inlet pipe is located and the pool bottom elevation 气 The setting is 5%, and each control parameter threshold is input to the remote control center (8) before the system is operated.

4. The source small cell wastewater pollutant deposition-erosion synergistic control method according to claim 1, characterized in that: The flow velocity control gate (7) in the pipeline flow limiting mode and the flushing mode in the step S2B is set to have a diameter equal to the diameter of the downstream pipeline, and the gate opening range is adjusted by the remote control center (8) within the full-closed to full-open range.

5. The source small cell wastewater pollutant deposition-erosion synergistic control method according to claim 1, characterized in that: After the sediment height monitored by the ultrasonic sludge level meter (3) in the sediment control pool in the step S3 exceeds the top of the inlet pipeline, the remote control center (8) receives a dredging warning signal and immediately takes relevant operation and maintenance strategies to avoid solidified material from blocking the pipeline.

6. The source small cell wastewater pollutant deposition-erosion synergic control method according to claim 1, characterized in that: After the infrared gas detection meter (4) in the step S3 detects that the methane concentration exceeds 5%, the connected alarm speaker (5) is started to remind residents not to approach the danger to prevent the methane gas from endangering personal safety.

7. A control system for use in a source cell sewage pollution deposition-erosion synergic control method as claimed in claim 1, comprising an upstream inspection shaft, and a sewage main pipe communicating with the inspection shaft, characterized in that: The sewage main pipeline and the sewage branch pipeline are connected in parallel; the sewage main pipeline and the sewage branch pipeline are connected at the inlet; the sewage main pipeline is provided with a flow velocity control box for temporary throttling and pipeline flushing control; the sewage branch pipeline is provided with a sediment control pool controlled by the remote control center; and 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 for use in a source cell wastewater pollutant deposition-erosion synergic control method according to claim 7, characterized in that: The switching valve comprises a sewage main pipeline inlet valve and a branch pipeline inlet valve, wherein the branch pipeline inlet valve is arranged at the inlet of the sewage branch pipeline, and the sewage main pipeline inlet valve is arranged in the sewage main pipeline downstream of the branch pipeline inlet valve.

9. The control system for use in a source cell wastewater pollutant deposition-erosion synergic control method according to claim 7, characterized in that: The flow velocity control box is connected in series on the sewage main pipeline, the top of the flow velocity control box extends upward, the inside of the flow velocity control box is provided with a cavity for temporarily storing sewage, and the drainage port of the flow velocity control box is provided with a pressure type liquid level meter and a flow velocity control gate to adjust the opening of the flow velocity control gate according to the flow velocity of the sewage in the sewage main pipeline.

10. The control system for use in a source cell wastewater pollutant deposition-erosion synergic control method according to claim 7, characterized in that: The top of the sediment control pool is provided with an infrared gas detection meter and an alarm speaker, the middle part of the sediment control pool is connected to the sewage branch pipeline on both sides, and the sidewall of the drainage end of the sediment control pool is fixedly provided with an ultrasonic sludge level meter.

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