CN116663965A - Urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring - Google Patents
Urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring Download PDFInfo
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Abstract
The invention discloses an urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring, which comprises the following steps: collecting and sorting pump station inflow of a sewage system studied, pump station service range, rainfall data, pump station inflow source, land utilization data and sewage pipe network topological relation data; quantitatively analyzing the external water network-entering water flow and the occupation ratio thereof by adopting a triangle graph method according to the water inflow and rainfall data of the pump station; the sewage system is divided into areas, and water quantity and water quality on-line monitoring points are distributed: and (3) analyzing water quantity and water quality on-line monitoring data: and (3) detecting and checking the defect CCTV geophysical prospecting of the drainage system: and diagnosing and verifying the problems of the sewage system. The invention can reduce the influence caused by the hysteresis of the artificial water quality sampling detection result, improve the diagnosis efficiency of the running state of the sewage system, provide reference for the follow-up numerical diagnosis or the special investigation work of the external water by combining with CCTV physical detection, and has important guiding significance for the promotion of the quality improvement and synergy work of the urban sewage system.
Description
Technical Field
The invention relates to an urban drainage system, in particular to an urban drainage system external water pre-diagnosis method based on online monitoring of water quantity and water quality.
Background
In recent years, with the continuous promotion of urban process in China, urban sewage treatment facilities are gradually perfected, sewage treatment capability is remarkably improved, urban water environment quality is continuously improved, and data released by urban and rural construction statistics annual authentication in 2020 shows that more than 4300 urban sewage plants are built and put into operation nationally, and total daily sewage treatment capability exceeds 2.3 hundred million m < 3 >. However, the phenomena of combined overflow, black and odorous river channels after rain and the like still commonly exist, and the problems of sewage systems such as low water inlet concentration, low actual collection rate, high operation cost and the like of a sewage plant frequently occur. The actual sewage treatment rate of China is less than 50%, a large amount of low-concentration foreign water invades the pipeline, so that the current sewage system has the problems of high water level operation and low water inlet concentration, the normal operation and efficiency of the sewage treatment system are seriously influenced, and the urban sustainable development and ecological civilization construction are adversely influenced.
In 2019, the three-part Commission jointly issues a three-year action scheme (2019-2021) of improving quality and enhancing efficiency of urban sewage, and the urban built-up area above 2021 is basically free of direct discharge of domestic sewage, so that a blank area of a domestic sewage collecting and treating facility is basically eliminated, black and odorous water bodies are basically eliminated, and the concentration efficiency of the urban domestic sewage is obviously improved. The Jiangsu province issues "urban wastewater treatment quality improvement and efficiency enhancement precision attack hardness" 333 "action scheme, and the requirements of fully covering, fully collecting and fully treating urban wastewater pipelines are basically met, so that" wastewater does not enter a river, external water does not enter a pipe, high concentration enters a factory and high efficiency of emission reduction "are met.
The infiltration of the external water leads to the cleaning part of the urban sewage pipe network, directly reduces the running efficiency of a sewage system, and the 'squeezing the external water' is always the important point of quality improvement and efficiency improvement. The traditional pipe network physical detection method is time-consuming and labor-consuming; the cost of manual water sampling test is high and certain time lag exists; the current intelligent on-line monitoring instrument is arranged sparsely and is not strong in targeting.
Disclosure of Invention
The invention aims to: the invention aims to provide an urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring.
The technical scheme is as follows: the invention discloses an urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring, which comprises the following steps:
s1, basic data collection and arrangement: the basic data comprise the pump station water inflow of the drainage system of the town under study, the service range of the pump station, the rainfall data, the source of the pump station water inflow, the land utilization data and the topological relation of the sewage pipe network, wherein the pump station water inflow and the rainfall data are daily historical data of at least one year;
s2, quantitatively analyzing the external water network flow and the occupation ratio thereof by adopting a triangle graph method according to the daily historical pump station water inflow and rainfall data of at least one year collected in the step S1;
s3, distributing water quantity and water quality on-line monitoring points in the sewage system partition area:
taking the service range of the town drainage system as a control unit, and dividing the subarea according to the junction points of the sewage main pipe and the branch pipe;
the arrangement principle of the on-line monitoring equipment is that a sewage main pipe is used as a first-stage monitoring point to arrange a flowmeter and a water quality detector, a branch pipe is used as a secondary monitoring point to arrange a water level meter, and the on-line monitoring equipment needs to comprise at least 1 field of typical rainfall events of light rain, medium rain and heavy rain in the monitoring time;
s4, analyzing water quantity and water quality on-line monitoring data:
comprising the following steps: analyzing drainage characteristics of the urban drainage system, and mastering the change rule of water quantity and water quality in sunny and rainy days; analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day, wherein the accuracy of rainfall data is required to be 5 min/time; analyzing the water level change amplitude of the secondary monitoring point in a rainy day; thereby locking the problem area;
s5, checking urban drainage system pipe network defects CCTV (Closed Circuit Television):
CCTV geophysical prospecting and investigation comprises low water level forward investigation of drain pipe leakage points and elevation water level reverse investigation of rain and sewage pipe serial connection points;
s6, diagnosing and verifying problems of a sewage system:
according to the online monitoring data obtained in the step S4 and the CCTV investigation result obtained in the step S5, the problems of the urban drainage system are guided, the tail end, the process and the source are eliminated one by one, the invasion of external water into a serious area and the type of external water are primarily locked, the numerical diagnosis work and the investigation of external water special items are guided, the investigation range is reduced, and the workload is reduced.
Further, in the step S1, the data accuracy of the water inflow amount and the rainfall amount of the pump station is at least 1 day/time.
Further, in the step S2, the triangle graph method is a graph method based on daily flow, the proportion of the daily sewage flow to the maximum daily sewage is taken as an abscissa, the proportion of the daily sewage to the maximum daily sewage is taken as an ordinate, the daily average sewage of pump stations of at least one year is arranged in ascending order, the proportion of the daily sewage to the maximum daily sewage is calculated day by day to form an S-shaped curve, the triangle graph method assumes that the primary sewage flow is constant, and the graph is represented as a horizontal line; the area below the horizontal line is the original sewage amount in the time period, and the area between the S-shaped curve and the horizontal line represents the external water amount in the time period, including the underground water infiltration amount, the river water infiltration amount and the rainwater mixing flow; according to rainfall data corresponding to a daily sewage amount period, counting the proportion of sunny days in one year, marking a point A in the graph, drawing a perpendicular S curve at the point B, and drawing a straight line from the intersection point B to a right lower corner point C, wherein the area below the straight line is expressed as annual groundwater and river water infiltration amount, and the area above the straight line is expressed as the sum of annual rainwater infiltration amount.
Further, the step S3 specifically includes:
the water inlet line of a sewage collecting pump station in the urban drainage system is regarded as a sewage main pipe, the water collecting line of the sewage main pipe is regarded as a primary branch pipe, the sewage collecting range of the primary branch pipe corresponds to the area range, and the number of the sewage main pipe and the primary branch pipe which are intersected is the area number;
the junction of the sewage main pipe and the primary branch pipe is a primary monitoring point, the primary branch pipe water collecting range comprises a secondary branch pipe with larger water quantity, and the junction of the primary branch pipe and the secondary branch pipe is a secondary monitoring point.
Further, the specific method for analyzing the drainage characteristics of the system in step S4 is as follows: drawing a change trend chart of daily water inflow and rainfall of the pump station in the monitoring period by using Origin to obtain the water quantity average value of the pump station in the dry day in the monitoring period; analyzing the relation between the water inflow and the rainfall of the pump station by using SPSS Pelson correlation;
the method for analyzing the water quantity and water quality change trend of the first-stage monitoring point rainy day comprises the following steps: drawing a flow and water quality change chart of monitoring points before and after rainfall by using Origin, wherein the water quantity and water quality in the early period of rainfall are multiplied under the rainfall events of medium rainfall and heavy rainfall, and the water quantity and water quality are recovered to be the level of a dry day after 30-60 minutes after the rainfall;
the method for analyzing the water level change amplitude of the secondary monitoring point comprises the following steps of; and drawing a rain water level change chart of the sewage pipeline at the time intervals before and after rainfall by using Origin, and judging a problem area according to the area of the corresponding catchment range and the liquid level change amplitude, wherein if the catchment area is small and the liquid level change amplitude is large, the problem of external water invasion is serious.
Further, the step S5 specifically includes:
the external water enters the sewage pipeline in the forward direction, and the sewage overflows from the sewage pipeline to the rainwater pipe in the reverse direction; the forward investigation refers to the investigation of the passage of external water into a sewage pipeline by using CCTV along a pipe network under the low water level operation condition of the sewage pipe network; the reverse investigation means that the water level of the sewage pipeline is lifted by a pump station system in dry days, whether the water level of the adjacent rainwater pipes is obviously increased is observed, so that judgment is made, and if the water level is increased, a rainwater and sewage pipeline mixing joint exists.
Further, the step S6 specifically includes:
the tail end refers to a sewage collection pump station in a town drainage system, the process refers to a pipe network for conveying sewage, and the source refers to a source drainer for generating and discharging sewage; when the problem that the collected water quantity is not matched with the theoretical sewage quantity occurs in the sewage collecting pump station, verifying the damage and water leakage condition of the pump station structure, and if the pump station operates normally, the problem of the urban drainage system occurs in a pipe network and a source drainage user; the method is characterized in that on-line monitoring equipment is installed at a first-stage monitoring point and a second-stage monitoring point of a pipe network, node flow and water level differences in sunny and rainy days are compared, CCTV is used for checking pipeline defects and rain and sewage mixed joints, the difference between abnormal water quantity caused by checking defects and abnormal water quantity of a researched town drainage system is far smaller than the abnormal water quantity of the system, and the main problem occurs in a source drainage user when the pipe network defects are not caused to cause abnormal operation of the system in the process of description.
In another embodiment of the invention, an urban drainage system external water pre-diagnosis system based on online monitoring of water quantity and water quality comprises:
the data collection and arrangement module is used for collecting pump station water inflow, pump station service range, rainfall data, pump station water inflow sources, land utilization data and sewage pipe network topological relations of the studied town drainage system, wherein the pump station water inflow and rainfall data are daily historical data of at least one year;
the external water network-entering water quantity and the occupation ratio analysis module is used for quantitatively analyzing the external water network-entering water flow and the occupation ratio by adopting a triangle graph method according to collected daily historical pump station water inflow and rainfall data of at least one year;
the on-line monitoring point position layout module is used for dividing the area according to the junction points of the sewage main pipe and the branch pipe by taking the range of the town drainage system as a control unit; the arrangement principle of the on-line monitoring equipment is that a sewage main pipe is used as a first-stage monitoring point to arrange a flowmeter and a water quality detector, a branch pipe is used as a secondary monitoring point to arrange a water level meter, and the on-line equipment monitoring time needs to comprise at least 1 field of typical rainfall events of light rain, medium rain and heavy rain respectively;
the on-line monitoring data analysis module is used for analyzing the drainage characteristics of the urban drainage system and grasping the change rule of the water quantity and the water quality in sunny and rainy days; analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day, wherein the accuracy of the rainfall data is required to be 5 min/time; analyzing the water level change amplitude of the secondary monitoring point in the rainy day; thereby locking the problem area;
the CCTV investigation module is used for forwardly investigating the leakage point of the sewage pipeline at a low water level and reversely investigating the serial connection point of the rain and sewage pipeline at a raised water level;
and the problem diagnosis and verification module is used for guiding the problems of the urban drainage system, removing the problems from the tail end, the process and the source one by one according to the on-line monitoring data and the CCTV investigation result, preliminarily locking the serious area and the type of the external water invasion, guiding the numerical diagnosis work and the external water special investigation, reducing the investigation range and reducing the workload.
In yet another embodiment of the present invention, an apparatus device comprises a memory and a processor, wherein:
a memory for storing a computer program capable of running on the processor;
and the processor is used for executing the steps of the urban drainage system external water pre-diagnosis method based on the online water quantity and quality monitoring when the computer program is run.
In yet another embodiment of the present invention, a storage medium has a computer program stored thereon, which when executed by at least one processor implements the steps of a town water system external water pre-diagnosis method based on water quantity and quality on-line monitoring as described above.
The beneficial effects are that: compared with the prior art, the invention has the remarkable technical effects that:
aiming at the problems of abnormal water quantity and low water quality of inflow water of a sewage system, the invention firstly provides that the historical data is preferentially utilized to analyze the invasion proportion of the inflow water, the water quantity and quality on-line monitoring equipment is installed on a main sewage pipe and a branch pipe with larger water quantity in a patch area, so that the cost of manpower and material resources for large-batch monitoring is saved, the influence caused by the hysteresis of the detection result of manual water quality sampling is reduced, the inflow water and outflow water infiltration conditions in an area are identified through the analysis of on-line monitoring data, the diagnosis efficiency of the running state of the sewage system is improved, and the invention provides references for the follow-up numerical diagnosis or the investigation work of the inflow water special for the outflow water by combining with CCTV physical detection; has guiding significance for the pre-diagnosis of the invasion of the urban sewage system by the external water, and is beneficial to improving the working efficiency and accuracy of the urban pipe network external water investigation.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a triangle diagramming method;
FIG. 3 is a graph of daily sewage flow from a D pump station of 2021;
FIG. 4 is a schematic diagram of the distribution of wastewater partitions and monitoring points in a research area;
FIG. 5 is a graph of pump station lift versus rainfall;
FIG. 6 is a first level monitoring point for a rainy day for water volume and quality change;
FIG. 7 rain pipe water level change at secondary monitoring point in rainy days.
Detailed Description
The invention is further described below in connection with specific embodiments. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
According to the urban drainage system external water pre-diagnosis method based on the online monitoring of the water quantity and the water quality, the online monitoring equipment is arranged in a partitioned drainage and subarea mode by collecting basic data such as the operation condition of a pump station in a research area, the topological relation of a pipe network and the like, the water quantity and the water quality data are analyzed and combined with manual investigation work, the sewage system is subjected to preliminary analysis and diagnosis, the main type of external water invasion is judged, and the area with serious external water invasion is focused. As shown in fig. 1, the method specifically comprises the following steps:
s1, collecting and arranging basic data;
the basic data comprise pump station water inflow of the drainage system of the researched town, rainfall data, pump station service range, pump station water inflow source, land utilization data, sewage pipe network topological relation and the like, wherein the accuracy of the pump station water inflow and rainfall data is at least 1 d/time (1 day/time), and daily historical pump station water inflow and rainfall data of at least 1 year are obtained.
S2, quantitatively analyzing the water quantity of the external water entering the network by a triangle drawing method and the ratio of the water quantity;
quantitatively analyzing the water quantity and the ratio of the external water to the sewage pipe network by a triangle graph method, wherein the required data are the water inflow and rainfall data of the pump station day by day 1 mentioned in the step S1;
the triangle graph method is a graph method based on daily flow, the proportion of the daily sewage flow to the maximum daily sewage flow is taken as an abscissa, the proportion of the daily sewage flow to the maximum daily sewage flow is taken as an ordinate, the daily average sewage flow of at least one year of pump stations is arranged in ascending order, and the proportion of the daily sewage flow to the maximum daily sewage flow is calculated day by day to form an S-shaped curve, as shown in figure 2. The triangle graph method assumes that the raw sewage flow is constant and is represented as a horizontal line in the figure. The area below the horizontal line is the primary sewage flow in the time period, and the area between the S-shaped curve and the horizontal line represents the external water quantity in the time period, including the groundwater infiltration quantity, the river infiltration quantity and the rainwater mixing flow. According to rainfall data corresponding to a daily sewage quantity period, counting the proportion of sunny days in one year, marking a point A in the graph, drawing a perpendicular S curve at the point B, and drawing a straight line from the intersection point B to a right lower corner point C, wherein the area below the straight line is expressed as the annual groundwater and river water infiltration quantity, and the area above the straight line is expressed as the sum of annual rainwater infiltration quantity.
S3, distributing water quantity and water quality on-line monitoring points in the sewage system partition area;
the dividing method of the sewage system is to divide the sewage system into the areas by taking the range of the studied town drainage system as a control unit and the junction point of the main sewage pipe and the branch pipe, and the concrete method is as follows:
regarding a water inlet line of a sewage collecting pump station in a researched town drainage system as a sewage main pipe, regarding a water collecting line of the sewage main pipe as a primary branch pipe, wherein the sewage collecting range of the primary branch pipe corresponds to the area range, and the number of the sewage main pipe and the primary branch pipe which are intersected is the area number;
the arrangement principle of the on-line monitoring equipment is that a flowmeter and a water quality detector are arranged at a first-stage monitoring point, and a water level gauge is arranged at a secondary monitoring point, and the specific method is as follows:
the junction of the sewage main pipe and the primary branch pipe is a primary monitoring point, the primary branch pipe water receiving range comprises a secondary branch pipe with larger water quantity, and the junction of the primary branch pipe and the secondary branch pipe is a secondary monitoring point;
in addition, the monitoring time of the online monitoring equipment needs to comprise at least 1 field of typical rainfall events of light rain, medium rain and heavy rain, and the rain type division basis is defined by a meteorological part: the rainfall is less than 10mm in 24 hours and is light rain, the rainfall is between 10 and 25mm in 24 hours and is medium rain, and the rainfall is between 25 and 50mm in 24 hours and is heavy rain.
S4, analyzing water quantity and water quality on-line monitoring data;
the data analysis method comprises the following steps: analyzing drainage characteristics of the urban drainage system, and mastering the change rule of water quantity and water quality in sunny and rainy days; analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day, wherein the accuracy of rainfall data is required to be 5 min/time; and analyzing the water level change amplitude of the secondary monitoring point.
The specific method for analyzing the drainage characteristics of the system comprises the following steps: drawing a change trend chart of daily water inflow and rainfall of the pump station in the monitoring period by using Origin to obtain the water quantity average value of the pump station in the dry day in the monitoring period; and (5) analyzing the relation between the water inflow and the rainfall of the pump station by using the SPSS Pelson correlation.
The method for analyzing the water quantity and water quality change trend of the first-stage monitoring point rainy day comprises the following steps: and drawing a flow and water quality change chart of monitoring points before and after rainfall by using Origin, wherein the water quantity and water quality in the early period of rainfall are multiplied under the rainfall events of medium rain and heavy rain, and the water quantity and water quality are recovered to be the level of a dry day after 30-60 minutes after the rainfall.
The method for analyzing the water level change amplitude of the secondary monitoring point comprises the following steps of; and drawing a rain water level change chart of the sewage pipeline at the time intervals before and after rainfall by using Origin, and judging a problem area according to the area of the corresponding catchment range and the liquid level change amplitude, wherein if the catchment area is small and the liquid level change amplitude is large, the problem of external water invasion is serious.
S5, checking the defect CCTV (Closed Circuit Television) of the drainage system;
CCTV investigation comprises low water level forward investigation of drain pipe leakage points and raised water level reverse investigation of rain and sewage pipe serial connection points, and the specific method comprises the following steps:
the external water enters the sewage pipeline in the forward direction, and the sewage overflows from the sewage pipe to the rainwater pipe in the reverse direction. The forward investigation refers to the investigation of the passage of external water into a sewage pipeline by using CCTV along a pipe network under the low water level operation condition of the sewage pipe network; the reverse investigation means that the water level of the sewage pipeline is lifted by a pump station system in the dry days, whether the water level of the adjacent rainwater pipes is obviously increased is observed so as to judge, and if the water level is increased, a rainwater and sewage pipeline mixing joint exists;
s6, diagnosing and verifying problems of the sewage system;
according to the online monitoring data obtained in the step S4 and the CCTV investigation result obtained in the step S5, the problems of the urban drainage system are guided, the tail end, the process and the source are eliminated one by one, and the external water invasion serious area and the external water type are primarily locked, wherein the specific method comprises the following steps:
the tail end refers to a sewage collection pump station in a town drainage system, the process refers to a pipe network for conveying sewage, and the source refers to a source drainer for generating and discharging sewage. When the problem that the collected water quantity is not matched with the theoretical sewage quantity occurs in the sewage collecting pump station, verifying the damage and water leakage condition of the pump station structure, and if the pump station operates normally, the problem of the urban drainage system occurs in a pipe network and a source drainage user; the method is characterized in that on-line monitoring equipment is installed at a first-stage monitoring point and a second-stage monitoring point of a pipe network, node flow and water level differences in sunny and rainy days are compared, CCTV is used for checking pipeline defects and rain and sewage mixed joints, the difference between abnormal water quantity caused by checking defects and abnormal water quantity of a researched town drainage system is far smaller than the abnormal water quantity of the system, and the main problem occurs in a source drainage user when the pipe network defects are not caused to cause abnormal operation of the system in the process of description.
Examples:
s1, collecting and arranging basic data;
the service area of a sewage pumping station in the city D in the south is about 200 hectares, the total length of a sewage pipe network is about 30km, and the main type of land in the service range of the pumping station is industrial land. The water inflow of the pump station consists of two parts, and the lifting of the downstream L pump station and the collection of the gravity area are realized. The water inflow of the pump station and the rainfall are historical annual data day by day (2021, 1 month-2021, 12 months).
S2, quantitatively analyzing the water quantity of the external water entering the network by a triangle drawing method and the ratio of the water quantity; the method comprises the steps of carrying out a first treatment on the surface of the
The daily sewage flow curve is obtained by sorting the water inflow and rainfall of the sewage pump station 2021 year by year, as shown in fig. 3. Wherein the primary sewage accounts for 63.14%, the groundwater accounts for about 13.58%, the river water accounts for about 23.28%, and the sewage flow curve can intuitively find that the water quantity of the pump station in rainy days is obviously abnormal.
S3, distributing water quantity and water quality on-line monitoring points in the sewage system partition area;
four areas A, B, C, D are divided by the converging points of the sewage main pipe and the branch pipe. The arrangement principle of the on-line monitoring equipment is that a flowmeter and a water quality detector are arranged at a first-stage monitoring point, and a water level gauge is arranged at a second-stage monitoring point, as shown in fig. 4. The specific method comprises the following steps: the junction of the sewage main pipe and the primary branch pipe is a primary monitoring point, the primary branch pipe water receiving range comprises a secondary branch pipe with larger water quantity, and the junction of the primary branch pipe and the secondary branch pipe is a secondary monitoring point; the west river-passing road of the service range of the pump station is a sewage main pipe which is converged into the D pump station, the Liuyang river road, the Xinzhu two road, the Xinzhu four road and the Tianhe road are primary branch pipes, and the innovative major road and the technological major road are secondary branch pipes with larger water quantity.
The monitoring time is 2022 and 7 months for 31 days, wherein the data accuracy of flow, water level, water quality COD and rainfall is 5 min/time.
S4: analyzing water quantity and water quality on-line monitoring data;
the sewage system problems are guided, the tail end, the process and the source are eliminated one by one, and the problem area is locked. Firstly, analyzing drainage characteristics of the system, and grasping the change rule of water quantity and water quality in sunny and rainy days. Day average value 20306m of lifting water quantity of 2022 and 7-month D sewage pump station 3 As can be seen from FIG. 5, there is a significant forward relationship between pump station lift and rainfall, and the SPSS correlation analysis results show that the pump station water intake and rainfall correlation coefficient is 0.694 (P<0.01 And the obvious positive correlation is formed, and the inflow and infiltration phenomenon caused by rainfall is obvious.
And secondly, analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day. Two typical rainfalls were monitored in the study area of month 7 of 2022, and characteristic parameters of the rainfall event are shown in table 1. The two-way incoming water flow and water quality change of the sewage main pipe before and after rainfall is shown as a) to d) in fig. 6, wherein a) is the rainfall, flow and COD change trend of the junction of the river-passing road of the front and rear male river before and after 7 months and 9 days, b) is the rainfall, flow and COD change trend of the junction of the two-way river-passing road of the new bamboo before and after 7 months and 9 days, the rainfall, the flow and the COD change trend of the junction of the river-passing road of the front and rear of the 7-month 17-day rainfall are the rainfall, the flow and the COD change trend of the junction of the river-passing road of the front and rear of the 7-month 17-day new bamboo; mainly the following rules are presented: 1) The rainfall causes the sewage pipe flow to increase in multiple, and the flow peak appears after the rainfall event begins for 40-50 min; 2) The COD concentration in sunny days is about 150-200mg/L, and the COD concentration is increased rapidly after rainfall, and then the mixture is diluted to the sunny level. The water quantity and the water quality of the sewage pipe network in the sheet area are primarily diagnosed to be influenced by rainwater, and the phenomenon of COD rising and falling is presumed to correspond to the initial scouring effect of the rainfall and the dilution effect of the rainwater in the middle and later stages.
TABLE 1 rainfall event characterization parameters
Finally, the water level change amplitude analysis of the rainwater pipe and the sewage pipe at the secondary monitoring point is carried out, as shown in fig. 7. The phenomenon that the liquid levels of the sewage pipeline and the rainwater pipeline are lifted and lowered in the rainy day indicates that the inside of the pipe network is in staggered and mixed connection to a certain extent, and rainwater flows into the sewage system. The change amplitude of the liquid level of the sewage pipeline in the rainfall process is that the innovation lane of the liuyang river is changed into the innovation lane of the new bamboo two-way and the technology lane of the new four-way, which shows that the innovation lane of the liuyang river and the innovation lane of the new bamboo two-way are more serious than the inflow problem of the external water in the rain weather in A, B areas.
S5, performing CCTV geophysical prospecting and investigation on the defect of the drainage system;
utilize CCTV investigation municipal administration to be responsible for, including low water level forward investigation sewer line leak source and raise the reverse investigation rain and sewage pipe string connection point of water level, artifical forward investigation on foot combines CCTV, and whole line sewer line is the investigation of well by well (including the extension tube well), and investigation has obvious pipeline seepage, running water, construction drainage problem, on the basis of forward investigation, adopts pump station system sewage water level lifting test, carries out investigation behind the sewer line liquid level lifting, rainwater pipeline and the abnormal conditions of arranging the mouth to find rain and sewage string connection point, investigation result shows that municipal administration is responsible for has no obvious defect on sunny day.
S6, diagnosing and verifying problems of the sewage system.
The system is locked from the water quantity change rule of the tail end pump station by combining the 2021 year historical data, 2022 year 7 month online water quantity and quality monitoring data and CCTV auxiliary investigation results, the most main external water type of the system is rainwater, the invasion of the drought external water caused by municipal pipe network breakage is eliminated, the key reason for preliminarily diagnosing the water quantity abnormality of the system is drainage of a rainy day source, and the problem of A, B areas corresponding to the Liuyang river road innovation major road and the new bamboo two road innovation major road is more serious.
To verify the effect of initial rainwater drainage of the source drainer on the water quantity of the system, two enterprises in A, B areas are selected for calculation. The total amount of the rainwater runoff is calculated by the comprehensive runoff coefficient, the rainfall thickness and the comprehensive runoff coefficient of the research area, and the calculation formula is shown as formula (1):
W＝Ψ c h y S/1000 (1)
wherein W is the total amount m of rainwater runoff 3 ；Ψ c -synthesizing the runoff coefficients; h is a y The rainfall thickness is mm; s-catchment area m 2 。
After the proportion of the undersea surfaces of greenbelts, houses, roads and the like in two factories is determined, the comprehensive runoff coefficients are respectively 0.79 and 0.78,7 months, the total rainfall runoff amounts of two typical rainfall emission drops is 1540 cubic meters and 1680 cubic meters, and the contribution rate of the abnormal water amount of the current pump station is 20.1 percent. In summary, the main problem of the sewage diagnosis system is the abnormal drainage of the source drain in rainy days.
In another embodiment of the invention, an urban drainage system external water pre-diagnosis system based on online monitoring of water quantity and water quality comprises:
the data collection and arrangement module is used for collecting pump station water inflow, pump station service range, rainfall data, pump station water inflow sources, land utilization data and sewage pipe network topological relations of the studied town drainage system, wherein the pump station water inflow and rainfall data are daily historical data of at least one year;
the external water network-entering water quantity and the occupation ratio analysis module is used for quantitatively analyzing the external water network-entering water flow and the occupation ratio by adopting a triangle graph method according to collected daily historical pump station water inflow and rainfall data of at least one year;
the on-line monitoring point position layout module is used for dividing the area according to the junction points of the sewage main pipe and the branch pipe by taking the range of the town drainage system as a control unit; the arrangement principle of the on-line monitoring equipment is that a sewage main pipe is used as a first-stage monitoring point to arrange a flowmeter and a water quality detector, a branch pipe is used as a secondary monitoring point to arrange a water level meter, and the on-line equipment monitoring time needs to comprise at least 1 field of typical rainfall events of light rain, medium rain and heavy rain respectively;
the on-line monitoring data analysis module is used for analyzing the drainage characteristics of the urban drainage system and grasping the change rule of the water quantity and the water quality in sunny and rainy days; analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day, wherein the accuracy of the rainfall data is required to be 5 min/time; analyzing the water level change amplitude of the secondary monitoring point in the rainy day; thereby locking the problem area;
the CCTV investigation module is used for forwardly investigating the leakage point of the sewage pipeline at a low water level and reversely investigating the serial connection point of the rain and sewage pipeline at a raised water level;
and the problem diagnosis and verification module is used for guiding the problems of the urban drainage system, removing the problems from the tail end, the process and the source one by one according to the on-line monitoring data and the CCTV investigation result, preliminarily locking the serious area and the type of the external water invasion, guiding the numerical diagnosis work and the external water special investigation, reducing the investigation range and reducing the workload.
In yet another embodiment of the present invention, an apparatus device comprises a memory and a processor, wherein:
a memory for storing a computer program capable of running on the processor;
and the processor is used for executing the steps of the urban drainage system external water pre-diagnosis method based on the online water quantity and quality monitoring when the computer program is run.
In yet another embodiment of the present invention, a storage medium has a computer program stored thereon, which when executed by at least one processor implements the steps of a town water system external water pre-diagnosis method based on water quantity and quality on-line monitoring as described above.
In conclusion, the invention can identify the water infiltration conditions inside and outside the area through the analysis of the historical data and the online monitoring data of the sewage system, reduce the influence caused by the hysteresis of the manual water quality sampling detection result, improve the diagnosis efficiency of the running state of the sewage system, and provide references for the follow-up numerical diagnosis or the special investigation work of the external water by combining with CCTV physical detection. The invention has certain practicability and has important guiding significance for promoting the quality improvement and efficiency enhancement of urban sewage systems.
Claims (10)
1. The urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring is characterized by comprising the following steps of:
s1, basic data collection and arrangement: the basic data comprise the pump station water inflow of the drainage system of the town under study, the service range of the pump station, the rainfall data, the source of the pump station water inflow, the land utilization data and the topological relation of the sewage pipe network, wherein the pump station water inflow and the rainfall data are daily historical data of at least one year;
s2, quantitatively analyzing the external water network flow and the occupation ratio thereof by adopting a triangle graph method according to the daily historical pump station water inflow and rainfall data of at least one year collected in the step S1;
s3, distributing water quantity and water quality on-line monitoring points in the sewage system partition area:
taking the service range of the town drainage system as a control unit, and dividing the subarea according to the junction points of the sewage main pipe and the branch pipe;
the arrangement principle of the on-line monitoring equipment is that a sewage main pipe is used as a first-stage monitoring point to arrange a flowmeter and a water quality detector, a branch pipe is used as a secondary monitoring point to arrange a water level meter, and the on-line monitoring equipment needs to comprise at least 1 field of typical rainfall events of light rain, medium rain and heavy rain in the monitoring time;
s4, analyzing water quantity and water quality on-line monitoring data:
comprising the following steps: analyzing drainage characteristics of the urban drainage system, and mastering the change rule of water quantity and water quality in sunny and rainy days; analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day, wherein the accuracy of rainfall data is required to be 5 min/time; analyzing the water level change amplitude of the secondary monitoring point in a rainy day; thereby locking the problem area;
s5, checking the pipe network defect CCTV of the urban drainage system:
CCTV geophysical prospecting and investigation comprises low water level forward investigation of drain pipe leakage points and elevation water level reverse investigation of rain and sewage pipe serial connection points;
s6, diagnosing and verifying problems of a sewage system:
according to the online monitoring data obtained in the step S4 and the CCTV investigation result obtained in the step S5, the problems of the urban drainage system are guided, the tail end, the process and the source are eliminated one by one, the invasion of external water into a serious area and the type of external water are primarily locked, the numerical diagnosis work and the investigation of external water special items are guided, the investigation range is reduced, and the workload is reduced.
2. The urban drainage system external water pre-diagnosis method based on-line water quality monitoring according to claim 1, wherein the accuracy of the pump station water inflow and rainfall data in the step S1 is at least 1 day/time.
3. The urban drainage system external water pre-diagnosis method based on-line monitoring of water quantity and quality according to claim 1, wherein in the step S2, the triangle graph is a graph based on daily flow, the proportion of the daily sewage flow to the maximum daily sewage quantity is taken as an abscissa, the proportion of the daily sewage flow to the maximum daily sewage quantity is taken as an ordinate, the daily average sewage quantity of at least one year of pump stations is arranged in ascending order, the proportion of the daily sewage quantity to the maximum daily sewage quantity is calculated day by day, an S-shaped curve is formed, the triangle graph assumes the primary sewage flow to be constant, and the graph is expressed as a horizontal line; the area below the horizontal line is the original sewage amount in the time period, and the area between the S-shaped curve and the horizontal line represents the external water amount in the time period, including the underground water infiltration amount, the river water infiltration amount and the rainwater mixing flow; according to rainfall data corresponding to a daily sewage amount period, counting the proportion of sunny days in one year, marking a point A in the graph, drawing a perpendicular S curve at the point B, and drawing a straight line from the intersection point B to a right lower corner point C, wherein the area below the straight line is expressed as annual groundwater and river water infiltration amount, and the area above the straight line is expressed as the sum of annual rainwater infiltration amount.
4. The urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring according to claim 1, wherein the step S3 is specifically:
the water inlet line of a sewage collecting pump station in the urban drainage system is regarded as a sewage main pipe, the water collecting line of the sewage main pipe is regarded as a primary branch pipe, the sewage collecting range of the primary branch pipe corresponds to the area range, and the number of the sewage main pipe and the primary branch pipe which are intersected is the area number;
the junction of the sewage main pipe and the primary branch pipe is a primary monitoring point, the primary branch pipe water collecting range comprises a secondary branch pipe with larger water quantity, and the junction of the primary branch pipe and the secondary branch pipe is a secondary monitoring point.
5. The urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring according to claim 1, wherein the specific method of system drainage characteristic analysis in step S4 is as follows: drawing a change trend chart of daily water inflow and rainfall of the pump station in the monitoring period by using Origin to obtain the water quantity average value of the pump station in the dry day in the monitoring period; analyzing the relation between the water inflow and the rainfall of the pump station by using SPSS Pelson correlation;
the method for analyzing the water quantity and water quality change trend of the first-stage monitoring point rainy day comprises the following steps: drawing a flow and water quality change chart of monitoring points before and after rainfall by using Origin, wherein the water quantity and water quality in the early period of rainfall are multiplied under the rainfall events of medium rainfall and heavy rainfall, and the water quantity and water quality are recovered to be the level of a dry day after 30-60 minutes after the rainfall;
the method for analyzing the water level change amplitude of the secondary monitoring point comprises the following steps of; and drawing a rain water level change chart of the sewage pipeline at the time intervals before and after rainfall by using Origin, and judging a problem area according to the area of the corresponding catchment range and the liquid level change amplitude, wherein if the catchment area is small and the liquid level change amplitude is large, the problem of external water invasion is serious.
6. The urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring according to claim 1, wherein the step S5 is specifically:
the external water enters the sewage pipeline in the forward direction, and the sewage overflows from the sewage pipeline to the rainwater pipe in the reverse direction; the forward investigation refers to the investigation of the passage of external water into a sewage pipeline by using CCTV along a pipe network under the low water level operation condition of the sewage pipe network; the reverse investigation means that the water level of the sewage pipeline is lifted by a pump station system in dry days, whether the water level of the adjacent rainwater pipes is obviously increased is observed, so that judgment is made, and if the water level is increased, a rainwater and sewage pipeline mixing joint exists.
7. The urban drainage system external water pre-diagnosis method based on online water quantity and quality monitoring according to claim 1, wherein the step S6 is specifically:
the tail end refers to a sewage collection pump station in a town drainage system, the process refers to a pipe network for conveying sewage, and the source refers to a source drainer for generating and discharging sewage; when the problem that the collected water quantity is not matched with the theoretical sewage quantity occurs in the sewage collecting pump station, verifying the damage and water leakage condition of the pump station structure, and if the pump station operates normally, the problem of the urban drainage system occurs in a pipe network and a source drainage user; the method is characterized in that on-line monitoring equipment is installed at a first-stage monitoring point and a second-stage monitoring point of a pipe network, node flow and water level differences in sunny and rainy days are compared, CCTV is used for checking pipeline defects and rain and sewage mixed joints, the difference between abnormal water quantity caused by checking defects and abnormal water quantity of a researched town drainage system is far smaller than the abnormal water quantity of the system, and the main problem occurs in a source drainage user when the pipe network defects are not caused to cause abnormal operation of the system in the process of description.
8. Urban drainage system external water pre-diagnosis system based on water quantity and water quality on-line monitoring, which is characterized by comprising:
the data collection and arrangement module is used for collecting pump station water inflow, pump station service range, rainfall data, pump station water inflow sources, land utilization data and sewage pipe network topological relations of the studied town drainage system, wherein the pump station water inflow and rainfall data are daily historical data of at least one year;
the external water network-entering water quantity and the occupation ratio analysis module is used for quantitatively analyzing the external water network-entering water flow and the occupation ratio by adopting a triangle graph method according to collected daily historical pump station water inflow and rainfall data of at least one year;
the on-line monitoring point position layout module is used for dividing the area according to the junction points of the sewage main pipe and the branch pipe by taking the range of the town drainage system as a control unit; the arrangement principle of the on-line monitoring equipment is that a sewage main pipe is used as a first-stage monitoring point to arrange a flowmeter and a water quality detector, a branch pipe is used as a secondary monitoring point to arrange a water level meter, and the on-line equipment monitoring time needs to comprise at least 1 field of typical rainfall events of light rain, medium rain and heavy rain respectively;
the on-line monitoring data analysis module is used for analyzing the drainage characteristics of the urban drainage system and grasping the change rule of the water quantity and the water quality in sunny and rainy days; analyzing the water quantity and water quality change trend of the first-stage monitoring point in the rainy day, wherein the accuracy of the rainfall data is required to be 5 min/time; analyzing the water level change amplitude of the secondary monitoring point in the rainy day; thereby locking the problem area;
the CCTV investigation module is used for forwardly investigating the leakage point of the sewage pipeline at a low water level and reversely investigating the serial connection point of the rain and sewage pipeline at a raised water level;
and the problem diagnosis and verification module is used for guiding the problems of the urban drainage system, removing the problems from the tail end, the process and the source one by one according to the on-line monitoring data and the CCTV investigation result, preliminarily locking the serious area and the type of the external water invasion, guiding the numerical diagnosis work and the external water special investigation, reducing the investigation range and reducing the workload.
9. An apparatus device comprising a memory and a processor, wherein:
a memory for storing a computer program capable of running on the processor;
a processor for performing the steps of a town drainage system external water pre-diagnosis method based on-line monitoring of water quantity and quality as claimed in any one of claims 1 to 7, when said computer program is run.
10. A storage medium, wherein a computer program is stored on the storage medium, and when executed by at least one processor, the computer program realizes the steps of an urban drainage system external water pre-diagnosis method based on online monitoring of water quality and quantity according to any one of claims 1-7.
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