Method and system for judging running condition of sewage pipe network in dry season

Abstract

The invention provides a method and system for judging the running condition of a sewage pipe network in a dry season, and belongs to the field of sewage collection and treatment.The method comprises the steps of data collection, water volume judgment and water quality judgment, the running condition of the pipe network is further judged according to water volume and water quality results, and the damage degree of the pipe network can be preliminarily evaluated; preconditions are provided for later maintenance of the pipe network; according to the method, existing data such as water quantity and water quality and related research results are fully utilized, the method is simple and easy to implement, loss in the septic tank and sewage pipe collection process is fully considered, the system reflects the actual operation condition of the sewage pipe network, problems and hidden dangers in pipe network operation are found in time, and preconditions are provided for calculating the pipe network collection efficiency.

Description

Technical Field

[0001] The invention belongs to the field of sewage collection and treatment, and in particular relates to a method and a system for judging the operation status of a sewage pipe network in dry season. Background Art

[0002] Sewage treatment plants are an important tool for achieving the goal of the battle against pollution, and improving the collection efficiency of sewage pipe networks is the most important prerequisite for ensuring the efficient operation of sewage treatment plants. According to data from the Ministry of Housing and Urban-Rural Development, by the end of 2022, the total length of urban drainage pipes in my country will be 913,500 kilometers, a year-on-year increase of 4.73%. However, according to the analysis of existing data, due to the damage of the pipe network and the degradation of pollutants by pre-treatment facilities before the pipe network, the collection efficiency of my country's sewage pipe network is not high, resulting in the load entering the sewage treatment plant being far lower than expected. In view of this, the Ministry of Housing and Urban-Rural Development, the Ministry of Ecology and Environment, the National Development and Reform Commission, and the Ministry of Water Resources jointly issued the "Implementation Plan for Deepening the Battle of Urban Black and Smelly Water Body Governance", which clearly proposed that the centralized collection rate of urban domestic sewage should strive to reach 70%, and the influent BOD concentration should be higher than 100 mg / L. To achieve this goal, in addition to adding new sewage pipe networks according to demand, it is more important to strengthen the repair and operation and maintenance management of existing sewage pipe networks to give full play to their efficiency in collecting sewage. However, no matter it is a newly added pipeline network or an existing pipeline network, it is very necessary to know how to judge the operating status of the existing sewage pipeline network. This is not only the basic information that the industry management department but also the operation department needs to formulate industry plans and analyses.

[0003] There are many patent reports on the detection of the operation status of sewage pipe networks in the prior art. Chinese patent CN116956182A discloses a fault detection method in a sewage pipe network, which calculates the flow retention coefficient and the flow velocity retention coefficient through the sewage level change curve to determine the fault in the pipeline to be detected, but flow velocity measurement is required; Chinese patent CN117633642A discloses a drainage pipe network health diagnosis method, device, equipment and storage medium, which eliminates the misjudgment of water quality differences at monitoring points caused by differences between monitoring equipment by utilizing the core technical idea of ​​integrating sequence differences and monitoring trend similarities, but requires upstream and downstream data and model training; Chinese patent CN117540329A discloses a drainage pipe network defect online early warning method and system based on machine learning, but it is necessary to use a trained neural network early warning model to warn the pipe section with abnormal cumulative flow and adjacent inspection well water level differences; these methods can reflect the operation status of the sewage pipe network to a certain extent, but are relatively complicated in actual application. Chinese patent CN117541433A discloses a method for dynamically calculating the collection efficiency of urban sewage pipe networks in sewage treatment plant service areas. It uses weighted population data, pollution census data, sewage treatment plant inlet data, etc. in the service area to achieve dynamic calculation of the collection efficiency of urban sewage pipe networks in sewage treatment plant service areas. However, it does not consider the impact of sedimentation, biodegradation, etc. on pollutant removal during the transportation process of the sewage pipe network, nor does it consider the flow of external water entering the pipe network due to pipe network damage. Therefore, its calculation results fail to reflect the actual situation in some special cases. Summary of the invention

[0004] In order to address the deficiencies of the prior art, the purpose of the present invention is to provide a method for judging the operating status of a sewage network in a dry season. The method is based on water quantity and water quality data, fully considers the losses in septic tanks and sewage network transportation, and can relatively systematically reflect the actual operating status of the sewage network.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A method for determining the dry season operation status of a sewage pipe network comprises the following steps:

[0007] S1: Data collection, including water supply and consumption data;

[0008] S2: Water volume judgment, including calculating and comparing the theoretical daily sewage discharge, designed dry season flow, and actual flow differences of the sewage treatment plant within the service area of ​​the pipeline network based on the existing data collected in S1, and judging the operation status of the pipeline network;

[0009] S3: Water quality assessment, including calculation based on the existing data collected in S1, calculating and comparing the sum of the pollutant equivalent concentration collected by the sewage treatment plant, the pollutant equivalent concentration degraded by the septic tank in the service area, and the pollutant equivalent concentration degraded along the pipeline network with the difference in per capita discharge concentration, and further assessing the operation status of the pipeline network;

[0010] S4: Comprehensive analysis, including combining S2 and S3 to determine the operating status.

[0011] Among them, in S1, the water supply and water use data include basic information on the service scope of the pipe network, regional population data, water volume data and water quality data of sewage treatment plants, and regional water supply data collected from archives management departments, population management bureaus, water management and operation and maintenance departments, etc.;

[0012] Furthermore, in S1, the water supply and water use data include the sewage treatment plant inflow flow Q corresponding to the service range of the pipe network. in and concentration C in , equivalent water consumption population P T , daily sewage discharge per capita Q p , the average daily emission of a pollutant per capita C I , industrial wastewater flow Q i and a pollutant concentration C i , flow variation coefficient K, equivalent population P in a small area Ti and the average daily discharge of a pollutant per capita C Ii , the average degradation rate of a pollutant in a septic tank within a small area η 1i and the degradation rate η along the sewage pipe network 2i , dry season flow rate Q dr , local groundwater level h and pipe bottom height h D And other information.

[0013] Among them, in S1, the basic information of the pipeline network service scope includes the layout, flow direction, burial depth, pipe diameter, rainwater and sewage diversion conditions and future planned pipeline conditions.

[0014] Among them, in S2, the determination of the operation status of the pipeline network includes whether the pipeline network needs to be added or the pipeline network is normal or damaged.

[0015] Among them, in S2, the newly added identification condition of the pipe network is:

[0016] Calculate P based on the available data T ×Q P and Q dr / K, if P T ×Q P >(Q dr / K), it is determined that a new pipe network is needed;

[0017] Among them, in S2, the pipe network damage identification condition is:

[0018] On the basis of the existing pipeline network, when Q in ≤Q dr And h>h D When , the pipe network is normal;

[0019] When Q in ≤Q dr And h <h D When it is caused by sewage leakage, the pipe network is damaged;

[0020] When Q in >Q dr And h <h D When the external water enters the pipe network, the pipe network is damaged;

[0021] Among them, Q in is the inflow flow of the sewage treatment plant, Q dr is the dry season flow of the pipeline network, h is the groundwater level elevation within the service area of ​​the pipeline network, and h D It is the bottom elevation of the sewage pipe network.

[0022] In S3, the calculation formula for the equivalent concentration of pollutants collected by the sewage treatment plant is:

[0023] The calculation formula for the equivalent concentration of pollutants degraded by septic tanks in the service area is:

[0024]

[0025] The calculation formula for the equivalent concentration of pollutants degraded along the pipeline network is:

[0026] Among them, in S3, the calculation formula of the water quality concentration is: The conditions for determining the pipe network conditions are:

[0027] If the total pollutant equivalent concentration (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )=(C I / Q P ), the pipe network is judged to be normal;

[0028] If (Q in ×C in +P Ti×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )>(C I / Q P ), at this time, sewage seeps out, and it is determined that the pipe network is damaged;

[0029] If (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )<(C I / Q P ), at this time, external water enters the pipe network, and it is determined that the pipe network is damaged.

[0030] Furthermore, the method of the present invention also includes: after comprehensively analyzing and judging the operation status of the sewage pipe network, judging the defects of the sewage pipe network, and using CCTV technology to detect the defects of the sewage pipe network.

[0031] Among them, the pipeline defects include structural defects and functional defects. The structural defects include pipeline deformation, misalignment, and undulations. The functional defects include deposition, scaling, obstacles, and residual walls.

[0032] The present invention also provides a system for judging the operation status of a sewage pipe network in a dry season, the system comprising:

[0033] The data collection module is used to collect basic information about the service scope of the pipe network, population data of the service area, water quantity data and water quality data of the sewage treatment plant, and regional water supply data;

[0034] The water volume analysis module is used to calculate and compare the theoretical daily sewage discharge, designed dry season flow and inflow flow of the sewage treatment plant within the service range of the pipe network based on the information from the data collection module, and judge the operation status of the pipe network;

[0035] The water quality analysis module is used to calculate and compare the difference between the sum of the pollutant equivalent concentration collected by the sewage treatment plant, the pollutant equivalent concentration degraded by the septic tank in the service area and the pollutant equivalent concentration degraded along the pipeline network and the per capita sewage concentration based on the information from the data collection module, so as to further judge the operation status of the pipeline network;

[0036] The comprehensive evaluation module combines the water quantity analysis module and the water quality analysis module to comprehensively judge the operation status of the pipeline network.

[0037] The water quantity judgment module and the water quality judgment module obtain water quantity and water quality results by manually calculating through the set formula or by inputting the calculation model written according to the formula, and then preliminarily judge the operation status of the sewage pipe network.

[0038] The method for judging the operation status of a sewage pipe network in the dry season of the present invention is to make step-by-step judgments based on water quantity and water quality data, and comprehensively consider the influence of sewage pipe network damage and the deposition and degradation of pollutants in the pipe network during transportation, make full use of existing water quantity, water quality and other data and related research results, and combine water quantity and water quality data to diagnose the operation status of the sewage pipe network, understand the problems of sewage infiltration and external water inflow in the sewage pipe network, and provide a theoretical basis for the operation and maintenance of urban pipe networks.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The method of the present invention is simple and easy to implement. Except for the newly added data statistical analysis unit, other data are all from existing data and some literature data.

[0041] 2. The present invention does not require additional manpower and facilities for on-site operation, thus saving resources and achieving pre-diagnosis of the operation status of the sewage pipe network with minimal investment.

[0042] 3. The present invention has a wide range of applications and fully considers the losses in the septic tank and sewage pipe collection process. It can relatively systematically reflect the actual operating conditions of the sewage network, promptly discover problems and hidden dangers in the operation of the network, and provide prerequisites for calculating the collection efficiency of the network. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0045] Figure 1 It is a flow chart of the method for judging the operation status of a sewage pipe network in dry season according to the present invention;

[0046] Figure 2 It is a structural diagram of the system for judging the operation status of the sewage pipe network in the dry season of the present invention;

[0047] In the picture: Q in is the inflow flow of the sewage treatment plant; C in is the influent concentration of a pollutant in the sewage treatment plant; P T is the equivalent water consumption population, Q p is the daily sewage discharge per capita; C Iis the average daily discharge of a pollutant per capita; Q i is the flow rate of industrial wastewater; C i is the concentration of a pollutant in industrial wastewater; K is the coefficient of water volume change; P Ti Equivalent population in a small area; C Ii is the average daily emission of a pollutant per capita within a small area; η 1i is the degradation efficiency of a pollutant in a septic tank within a small area; η 2i Q is the efficiency of removing a pollutant due to sedimentation, degradation, etc. along the pipeline network within a small area; dr is the dry season flow of the pipeline network; h is the groundwater level elevation within the service area of ​​the pipeline network; h D It is the bottom elevation of the sewage pipe network. DETAILED DESCRIPTION

[0048] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] According to the document "Statistical Survey System for Urban (County) and Town Construction" (formulated by the Ministry of Housing and Urban-Rural Development of the People's Republic of China and approved by the National Bureau of Statistics in 2021), the calculation formula for the centralized collection rate of urban domestic sewage η is shown in Formula 1:

[0050]

[0051] Among them, Q in is the inflow flow rate of the sewage treatment plant, m 3 / d;C in is the pollutant concentration in the sewage treatment plant, g / m3; P T is the total number of people using water within the service area of ​​the pipe network, people; C I is the daily sewage discharge per capita g / (person·d). According to the "Outdoor Drainage Design Code", C BOD It can be 40-60g / (person·d), C SS It can be 40-70g / (person·d), C TN It can be 8-12g / (person·d), C TP It can be calculated as 0.9-2.5g / (person·d), and the specific value needs to be adjusted and selected according to the actual situation in different regions. T In addition to the actual resident population, it is also necessary to calculate the equivalent population P of industrial wastewater production. Te , see formula 2 for details.

[0052]

[0053] Where Q i is the industrial wastewater flow rate, m 3 / d; Ci is the concentration of industrial wastewater pollutants, g / m 3 ;

[0054] The calculation result of Formula 1 can intuitively express the centralized collection rate of sewage. However, in reality, due to the damage of the pipe network and the loss of pollutants due to sedimentation and biodegradation during sewage transportation, the centralized collection rate of urban domestic sewage calculated by Formula 1 is low, which makes Formula 1 unable to reflect the operation level of the sewage pipe network.

[0055] On this basis, the present invention makes full use of the existing water quantity, water quality and other data and related research results, and proposes a method for judging the operation status of the sewage pipe network in the dry season. The specific judgment steps are as follows:

[0056] S1: Data collection, including collecting the inflow flow Q of the sewage treatment plant corresponding to the service scope of the pipe network from the archives management department, population management bureau, water management and operation and maintenance department, etc. in and a pollutant concentration C in , equivalent water consumption population P T , daily sewage discharge per capita Q p , the average daily emission of a pollutant per capita C I , industrial wastewater flow Q i and a pollutant concentration C i , flow variation coefficient K, equivalent population P in a small area Ti and the average daily emission of a pollutant C Ii , the average degradation rate of a pollutant in a septic tank within a small area η 1i and the degradation rate η along the sewage pipe network 2i , dry season flow rate Q dr , local groundwater level h and pipe bottom height h D and other information;

[0057] S2: Water volume judgment, including calculating and comparing the daily discharge volume of the pipe network service area, the difference between the designed dry season flow and the sewage treatment plant inlet flow based on the existing data collected in S1, and judging the operation status of the pipe network; according to the calculation based on the existing data, if P T ×Q P >(Q dr / K), which means that the design capacity of the existing pipe network is too small, so a new pipe network is needed. At this time, no subsequent judgment and calculation are required. If the existing pipe network meets the requirements of sewage collection, if Q in ≤Q dr , and h>h D , this indicates that the pipe network is operating normally without damage; if Q in ≤Qdr , and h <h D , at this time, sewage seepage means that the pipe network is damaged; if Q in >Q dr , at this time, external water enters the pipe network, which means that the pipe network is damaged;

[0058] S3: Water quality assessment, including calculations based on existing data collected in S1, and calculation of pollutant equivalent concentrations collected by the sewage treatment plant Equivalent concentration of pollutants degraded by septic tanks in the service area and the equivalent concentration of pollutants degraded along the pipeline network The difference between the sum of the pollutant equivalent concentration (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )=(C I / Q P ), indicating that the pipe network is normal; if (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )>(C I / Q P ), it indicates sewage seepage; if (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )<(C I / Q P ), it means that external water enters the pipe network;

[0059] S4: Comprehensive evaluation, including combining S2 and S3 to comprehensively judge the operation status of the pipeline network.

[0060] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0061] Example 1

[0062] like Figure 1 As shown, a method for judging the operation status of a sewage pipe network in dry season is provided.

[0063] include:

[0064] S1: Collect data, set up a sewage treatment station within the service area of ​​a rural pipe network, and design the dry season flow Q dr 200m 3 / d, groundwater level h is -1.2m, h D (average) is -1.0m, serving population P T There are 410 people, and the average daily sewage discharge per capita is Q P 0.18m 3 , the flow coefficient K is 2.7, the daily BOD discharge is 50g / (person·d), there is no industrial wastewater in the area, and there is a normally operating septic tank with a BOD removal rate of 20%. Due to the large design pipe diameter and low flow rate in the pipe, the BOD removal rate of sedimentation and biodegradation along the pipeline is about 8%. The actual inflow flow rate Q of the sewage treatment station in 170m 3 / d, and the influent BOD is 120mg / L. The specific data are shown in Table 1.

[0065] Table 1 Data on the service scope of the sewage pipe network

[0066]

[0067]

[0068] S2: Water volume judgment,

[0069] Calculate and compare P T ×Q P and Q dr / K:

[0070] Daily sewage discharge in service area: P T ×Q P =410×0.18=73.8;

[0071] Sewage treatment plant inflow flow: Q dr / K=200 / 2.7=74.1;

[0072] Because the daily sewage discharge volume of the service area is less than the inflow flow of the sewage treatment plant, and the sewage Q in ≤Q dr , h>h D , judging that the pipe network is damaged.

[0073] S3: Water quality assessment,

[0074] Calculate the total pollutant concentration:

[0075] (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P ) = (170 × 0.12 + 410 × 0.05 × 0.2 + 410 × 0.05 × 0.08) / (410 × 0.18) = 0.43;

[0076] Calculate the per capita pollution concentration: C I / Q P =0.05 / 0.18=0.0028;

[0077] Since the total pollutant concentration is greater than the per capita pollution discharge concentration, it indicates sewage seepage.

[0078] S4: Comprehensive assessment, combined with S2 and S3, shows that sewage seepage occurs due to damage to the pipe network.

[0079] Example 2

[0080] In combination with Example 2, a method for determining the operation status of a sewage pipe network in a dry season is further described:

[0081] S1: Collect data, set up a sewage treatment station within the service area of ​​a rural pipe network, and design the dry season flow Q dr 500m 3 / d, groundwater level h is -1.2m, h D (average) is -2.0m, serving population P T 960 people, with an average daily sewage discharge of Q P 0.2m 3 , the flow coefficient K is 2.6, the daily BOD is 55g / (person·d), there is no industrial wastewater in the area, and there is a septic tank but it has not been cleaned for many years. Due to the large design pipe diameter and low flow rate in the pipe, the BOD removal rate of sedimentation and biodegradation along the pipeline is about 5%. The actual influent flow rate Q of the sewage treatment plant in 550m 3 / d, and the influent BOD is 80mg / L. The specific data are shown in Table 2.

[0082] Table 2 Data on the service scope of the sewage network

[0083]

[0084] S2: Water volume judgment,

[0085] Calculate and compare P T ×Q P and Q dr / K:

[0086] Daily sewage discharge in service area: P T ×Q P =960×0.2=192;

[0087] Sewage treatment plant inflow flow: Q dr / K=500 / 2.6=192.31;

[0088] Because the daily sewage discharge volume of the service area is less than the inflow flow of the sewage treatment plant, and the sewage Q in >Q dr , h>h D , judging that the pipe network is damaged.

[0089] S3: Water quality assessment,

[0090] Calculate the total pollutant concentration:

[0091] (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P ) = (550 × 0.08 + 960 × 0.055 × 0.05) / (960 × 0.2)

[0092] =0.24;

[0093] Calculate the per capita pollution concentration: C I / Q P =0.055 / 0.2=27.5,

[0094] Since the total pollutant concentration is less than the per capita pollution discharge concentration, it indicates that external water is entering.

[0095] S4: Comprehensive assessment, combined with S2 and S3, shows that external water enters the pipeline network due to damage.

[0096] According to the analysis of the above embodiment, it can be determined that the pipe network is damaged. Then, CCTV technology is used to detect the pipe network of the embodiment. It is found that the degree of defects in the pipe network is relatively minor, and the main problems are rupture and disconnection. The detection results are shown in Table 3. The rupture in the pipe network defect problem is caused by the quality of the pipe network, and the disconnection is caused by the local ground subsidence due to the non-standard construction of the pipe network; then according to the situation of the sewage pipe network, the pipe network was renovated and repaired as shown in Table 4.

[0097] Table 3 CCTV detection results

[0098] Test results Defect Type Defect level Level determination rupture Structural defects Minor defect (level 1) Slight peeling of the tube wall Disconnect Structural defects Minor defect (level 1) The disconnection distance is less than 1 / 2 of the pipe wall thickness

[0099] Table 4 Pipeline network repair plan

[0100] Defect Name Defect level Repair plan rupture Minor defect (level 1) Local resin curing repair Disconnect Minor defect (level 1) Local resin curing repair after mortar application

[0101] In addition, the present invention also provides a system for judging the operation status of a sewage pipe network in a dry season, the system comprising:

[0102] The data collection module is used to collect basic information about the service scope of the pipe network, population data of the service area, water quantity data and water quality data of the sewage treatment plant, and regional water supply data;

[0103] The water volume analysis module is used to calculate and compare the theoretical daily sewage discharge, designed dry season flow and inflow flow of the sewage treatment plant within the service range of the pipe network based on the information from the data collection module, and judge the operation status of the pipe network;

[0104] The water quality analysis module is used to calculate and compare the difference between the sum of the pollutant equivalent concentration collected by the sewage treatment plant, the pollutant equivalent concentration degraded by the septic tank in the service area and the pollutant equivalent concentration degraded along the pipeline network and the per capita sewage concentration based on the information from the data collection module, so as to further judge the operation status of the pipeline network;

[0105] The comprehensive evaluation module combines the water quantity judgment module and the water quality judgment module to comprehensively judge the operation status of the pipeline network.

[0106] The water quantity judgment module and the water quality judgment module obtain water quantity and water quality results by manually calculating through the set formula or by inputting the calculation model written according to the formula, and then preliminarily judge the operation status of the sewage pipe network.

[0107] The method and system for judging the operation status of a sewage pipe network in an embodiment of the present invention collects existing data from existing materials, and considers two factors: the influence of sedimentation, biodegradation, etc. on the removal of pollutants during transportation of the sewage pipe network and the influence of the flow rate of external water entering the pipe network due to pipe network damage. The method and system obtain water quantity and water quality results after manual calculation through a set formula or input of a calculation model written according to the formula, and then preliminarily judge the operation status of the sewage pipe network, and preliminarily analyze the degree of damage of the sewage pipe network based on the water quantity and water quality results, providing prerequisites for subsequent detailed inspection and diagnosis of the pipe network and pipe network renovation projects.

[0108] The conventional method of judging the operation status of sewage pipe networks does not take the above two factors into consideration, resulting in failure to truly reflect the operation status of sewage pipe networks. It is also relatively complicated in actual application and consumes a lot of manpower and material resources.

[0109] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for judging the operation status of a sewage pipe network in dry season, characterized in that: The following steps are involved: S1: Data collection, including water supply and consumption data; S2: Water volume judgment, including calculating and comparing the theoretical daily sewage discharge, designed dry season flow and sewage treatment plant inlet flow differences within the service area of ​​the pipe network based on the existing data collected in S1, and judging the operation status of the pipe network; S3: Water quality assessment, including calculating and comparing the sum of the pollutant equivalent concentration collected by the sewage treatment plant, the pollutant equivalent concentration degraded by the septic tank in the service area, and the pollutant equivalent concentration degraded along the pipeline network with the difference of per capita discharge concentration based on the existing data collected in S1, and further assessing the operation status of the pipeline network; S4: Comprehensive assessment, including combining S2 and S3 to comprehensively judge the operation status of the pipeline network.

2. The method for determining the dry season operation status of a sewage pipe network according to claim 1, characterized in that: In S1, the water supply and water use data include basic information on the service scope of the pipeline network, population data of the service area, water volume data and water quality data of the sewage treatment plant, and regional water supply data collected from archives management departments, population management bureaus, water management and operation and maintenance departments, etc.

3. The method for determining the dry season operation status of a sewage pipe network according to claim 1, characterized in that: In S2, the operation status of the pipeline network is determined to include whether the pipeline network needs to be added or whether the pipeline network is normal or damaged.

4. The method for determining the dry season operation status of a sewage pipe network according to claim 3, characterized in that: The new identification conditions for the pipe network are: Calculate P based on the available data T ×Q P and Q dr / K, if P T ×Q P >(Q dr / K), it is determined that a new pipe network is needed; Among them, P T is the equivalent water consumption population, Q p is the daily per capita sewage discharge, K is the water volume change coefficient, Q dr is the dry season flow of the pipeline network.

5. The method for determining the dry season operation status of a sewage pipe network according to claim 3, characterized in that: The pipe network damage identification conditions are: On the basis of the existing pipeline network, when Q in ≤Q dr And h>h D When , the pipe network is normal; When Q in ≤Q dr And h <h D When it is sewage seepage, it is determined that the pipe network is damaged; When Q in >Q dr And h <h D When the external water enters the pipe network, it is determined that the pipe network is damaged; Among them, Q in is the inflow flow of the sewage treatment plant, Q dr is the dry season flow of the pipeline network, h is the groundwater level elevation within the service area of ​​the pipeline network, and h D It is the bottom elevation of the sewage pipe network.

6. The method for determining the dry season operation status of a sewage pipe network according to claim 1, characterized in that: The calculation formula of the water quality concentration is: Among them, Q in is the inflow flow of the sewage treatment plant, C in is the influent concentration of a pollutant in the sewage treatment plant, P T is the equivalent water consumption population, Q p is the daily sewage discharge per capita, P Ti Equivalent population in a small area, C Ii is the average daily discharge of a pollutant per capita within a small area, η 1i is the degradation efficiency of a pollutant in a septic tank within a small area, η 2i It is the efficiency of pollutants removed due to sedimentation, degradation, etc. along the pipeline network within a small area.

7. The method for determining the dry season operation status of a sewage pipe network according to claim 1, characterized in that: The conditions for determining the pipe network conditions are: If the total pollutant equivalent concentration (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )=(C I / Q P ), the pipe network is judged to be normal; If (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )>(C I / Q P ), at this time, sewage seeps out, and it is determined that the pipe network is damaged; If (Q in ×C in +P Ti ×C Ii ×η 1i +P Ti ×C Ii ×η 2i ) / (P T ×Q P )<(C I / Q P ), at this time, external water enters the pipe network, and it is determined that the pipe network is damaged; Among them, Q in is the inflow flow of the sewage treatment plant, C in is the influent concentration of a pollutant in the sewage treatment plant, P T is the equivalent water consumption population, Q p is the daily sewage discharge per capita, C I is the average daily emission of a pollutant per capita.

8. The method for determining the collection efficiency of a sewage pipe network in dry season according to claim 1, characterized in that: Also includes: After comprehensive assessment, the defects of the sewage pipe network are determined and CCTV technology is used to detect defects in the sewage pipe network.

9. A system for judging the operation status of a sewage pipe network in dry season, characterized in that: The system comprises: The data collection module is used to collect basic information about the service scope of the pipe network, population data of the service area, water quantity data and water quality data of the sewage treatment plant, and regional water supply data; The water volume analysis module is used to calculate and compare the theoretical daily sewage discharge, designed dry season flow and inflow flow of the sewage treatment plant within the service range of the pipe network based on the information from the data collection module, and judge the operation status of the pipe network; The water quality analysis module is used to calculate and compare the difference between the sum of the pollutant equivalent concentration collected by the sewage treatment plant, the pollutant equivalent concentration degraded by the septic tank in the service area and the pollutant equivalent concentration degraded along the pipeline network and the per capita sewage concentration based on the information from the data collection module, so as to further judge the operation status of the pipeline network; The comprehensive evaluation module combines the water quantity analysis module and the water quality analysis module to comprehensively judge the operation status of the pipeline network.

10. The system for determining the operation status of a sewage pipe network in dry season according to claim 9, characterized in that: The water quantity analysis module and the water quality analysis module obtain water quantity and water quality results by manually calculating through set formulas or by inputting calculation models written according to the formulas, and then judge the operation status of the sewage pipe network.

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