A method for optimizing the flow direction of industrial wastewater in a drainage pipe network

Abstract

This application relates to the technical field of drainage pipe network management, and specifically relates to a method for optimizing the flow direction of industrial wastewater in a drainage pipe network. Based on the pipe point elevation database and the standard wastewater flow direction database, this application obtains a preset standard flow direction path, analyzes the actual flow direction path Ⅰ of industrial wastewater to the wastewater treatment plant, and determines whether there is an actual flow direction path P when comparing this flow direction path with the standard wastewater flow direction database A , while tracking the actual flow direction path Ⅱ and analyzing the actual flow direction path Ⅱ and the actual flow direction path P A respectively with the relationship of the preset standard flow direction path, and determining whether there is a flow direction path P with a short path and few common pipelines among the three T , and according to the connection relationship of the common pipelines, a method for optimizing the flow direction of industrial wastewater in the drainage pipe network is provided, which improves the accuracy of analyzing the inflow of industrial wastewater into its corresponding wastewater treatment plant, and at the same time optimizes the flow direction path of the next discharge.

Description

Technical Field

[0001] This application relates to the technical field of drainage network management, and particularly to a method for optimizing the flow direction of industrial wastewater in a drainage network. Background Art

[0002] Industrial wastewater refers to the wastewater discharged during industrial production, coming from workshops or mines. Due to the different production categories, process flows, raw materials used, and water components of various factories, the water quality of industrial wastewater varies greatly. According to the degree of pollution, it can be divided into two categories: production wastewater and production sewage. Production wastewater refers to the water that is slightly polluted or has a slightly increased water temperature during use. Cooling water belongs to this type of water, and it can usually be reused in production after simple treatment or directly discharged into the water body. Production sewage refers to the water that is severely polluted during use. This type of water is mostly harmful. Most of this sewage needs to be properly treated before being discharged or reused in production.

[0003] Currently, in industrial parks or industrial clusters, due to the close geographical locations of multiple enterprises, in order to save resources and improve the efficiency of wastewater treatment, shared wastewater treatment facilities and sewage pipes may be built. These pipes are shared within a certain distance but will eventually be diverted to the sewage outlets of each enterprise or a unified wastewater treatment plant. Therefore, the connection of sewage pipes is intricate. A single pipe can serve as an inflow pipe point or an outflow pipe point. There are multiple pipes connected to a single wastewater treatment plant, and the flow path generated during the actual discharge process may have an error compared to the pre-designed discharge path, resulting in an extended discharge path. As a result, it is impossible to accurately monitor whether industrial wastewater flows into its corresponding wastewater treatment plant and impossible to select the optimal discharge flow path.

[0004] In view of this, this application is proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve one of the foregoing technical problems, and provide a method for optimizing the flow direction of industrial wastewater in a drainage network, improving the accuracy of analyzing the inflow of industrial wastewater into its corresponding wastewater treatment plant, and simultaneously optimizing the flow path for the next discharge.

[0006] To solve the above technical problems, the present invention adopts the following solutions:

[0007] A method for optimizing the flow direction of industrial wastewater in a drainage network includes the following steps:

[0008] S1. Establish a pipe point elevation database: Establish a drainage pipe network database based on the pipeline data of pipe points. The drainage pipe network includes a wastewater initial inflow pipe, a common pipe, a total wastewater outflow pipe, and the rest are connecting pipes. Each pipe includes an inlet pipe point and an outlet pipe point. Obtain the elevation information of each pipe point and establish a pipe point elevation database;

[0009] S2. Establish a standard wastewater flow direction database: Based on the wastewater flow direction path between the target wastewater initial inflow pipe and the target wastewater treatment plant, establish a standard wastewater flow direction database. Use the standard wastewater flow direction database as a standard reference to determine whether the flow direction of industrial wastewater in the common pipe, connecting pipe, and total wastewater outflow pipe conforms to the standard wastewater flow direction database, and obtain a preset standard flow direction path;

[0010] S3. Analysis of the actual flow direction path Ⅰ of industrial wastewater to the wastewater treatment plant: According to the pipe point elevation database and the standard wastewater flow direction database, regard the pipe at the upper level of the common pipe as the wastewater source pipe, and the pipe at the lower level of the common pipe as the wastewater discharge pipe. Monitor the flow direction of wastewater in the lower-level pipe, two-level lower pipe... n-level lower pipe, and determine whether this flow direction path is consistent with the standard wastewater flow direction database;

[0011] If they are consistent, continue to repeatedly judge the relationship between the flow direction of the next common pipe in its lower-level pipe and two-level lower pipe and the standard flow direction database until it is determined that the flow direction path formed by the industrial wastewater from the last common pipe to the total wastewater outflow pipe is the actual flow direction path P A ;

[0012] If they are inconsistent, transfer to step S4;

[0013] S4. Trace the actual flow direction path Ⅱ of industrial wastewater in the remaining pipes;

[0014] S5. Analyze the actual flow direction path Ⅱ and the actual flow direction path P A Respectively, judge the relationship with the preset standard flow direction path, and determine whether there is a flow direction path P with a short path and few common pipes among the three; T .

[0015] Further preferably, according to the elevation information of the pipe point, judge whether the pipe point here is an inlet pipe point or an outlet pipe point.

[0016] Further preferably, in step S1, the drainage pipe network database includes: the number of pipes connected to the inlet pipe point of any pipe;

[0017] Among them, the quantity is at least one or more.

[0018] Further preferably, according to the number of pipes connected to the inlet pipe point of any of the pipes, analyze the specific type of this pipe; if a quantity data is obtained, determine that this pipe is a connected pipe according to the pipeline database; if two or more quantity data are obtained, determine that this pipe is a common pipe according to the pipeline database.

[0019] Further preferably, the S2 step further includes the following steps:

[0020] S201, obtain the discharge positioning data of the industrial wastewater and the positioning data of the target wastewater treatment plant, where the positioning data is based on the geographic coordinate data of the positioning module;

[0021] S202, analyze the distance between the starting inflow pipe of the industrial wastewater and the total outflow pipe of the wastewater, and obtain multiple wastewater flow paths existing between the two;

[0022] S203, determine whether the multiple wastewater flow paths exist in the standard wastewater flow database.

[0023] Further preferably, judge the distance between the starting inflow pipe of the wastewater and the total outflow pipe of the wastewater through the geographic coordinate data.

[0024] Further preferably, in the S203 step, if there is a short-distance and few common pipes in the overlapping flow path P obtained, L , then this flow path P L is the preset standard flow path.

[0025] Further preferably, the S4 step further includes the following steps:

[0026] S401, obtain the pressure values when the industrial wastewater flows into or out of the pipe point in each pipe;

[0027] S402, when the industrial wastewater flows to the next common pipe I, judge whether there is a common pipe N in the next-level pipe, the next two-level pipes,..., the next n-level pipes between the common pipe I and the target wastewater treatment plant;

[0028] S403, according to the change of the pressure values of each pipe, obtain the flow direction of the industrial wastewater from the next-level pipe, the next two-level pipes,..., the next n-level pipes of the common pipe I to the total wastewater outflow pipe, and obtain the actual flow path II'.

[0029] Further preferably, the S402 step further includes the following steps:

[0030] S4021, if it exists, analyze the specific number of the common pipes N, determine the upper-level pipe and the lower-level pipe of each common pipe N, and determine the positioning data of the common pipe adjacent to the total wastewater outflow pipe.

[0031] The end of the total wastewater outflow pipe is directly connected to the target wastewater treatment plant;

[0032] S4022, if not, the industrial wastewater will sequentially pass through the next n - level pipes and be discharged into the target wastewater treatment plant to obtain the actual flow path Ⅱ''.

[0033] Further preferably, the S5 step further includes the following steps:

[0034] S501, if it exists, the flow path P T is included in the standard wastewater flow database;

[0035] S502, if it does not exist, the actual flow path P A is used as the optimized industrial wastewater flow path.

[0036] The beneficial effects of the present invention are as follows: Based on the pipe point elevation database and the standard wastewater flow database, the preset standard flow path is obtained. By analyzing the actual flow path Ⅰ of industrial wastewater to the wastewater treatment plant, it is judged whether there is an actual flow path P when comparing this flow path with the standard wastewater flow database A , and at the same time, the actual flow path Ⅱ is traced, and the relationships between the actual flow path Ⅱ and the actual flow path P A and the preset standard flow path are analyzed respectively, and it is judged whether there is a flow path P with a short path and few common pipes among the three. T According to the connection relationship of the common pipes, a method for optimizing the flow of industrial wastewater in the drainage network is provided, which improves the accuracy of analyzing the inflow of industrial wastewater into its corresponding wastewater treatment plant, and at the same time optimizes the flow path of the next discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic flow chart of the method for optimizing the flow of industrial wastewater in the drainage network of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0040] Meanwhile, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale relationships.

[0041] In addition, for clarity and conciseness, descriptions of well-known structures, functions, and configurations may be omitted. Those of ordinary skill in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0042] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be regarded as part of the authorization specification.

[0043] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values. Embodiment

[0044] An embodiment of the present invention is a method for optimizing the flow direction of industrial wastewater in a drainage pipe network. Referring to Figure 1 , it includes the following steps:

[0045] S1. Establish a pipe point elevation database: Establish a drainage pipe network database based on the pipeline data of the pipe points. The drainage pipe network includes a wastewater starting inflow pipe, a common pipe, a total wastewater outflow pipe, and the rest are connecting pipes. Each pipe includes an inlet pipe point and an outlet pipe point. Obtain the elevation information of each pipe point and establish a pipe point elevation database.

[0046] Among them, obtain the pipe point and pipeline data according to the requirements of the "Technical Specification for Urban Underground Pipeline Detection". Mainly obtain the starting elevation information and the ending elevation information of the pipe points, so as to establish a pipe point elevation database, and thus can judge whether the pipe point here is an inlet pipe point or an outlet pipe point according to the elevation information of the pipe point. The types of pipe points mainly include pipe points and pipelines related to discharging industrial wastewater.

[0047] In addition, in step S1, the drainage pipe network database includes: the number of pipes connected to the inlet pipe point of any pipe;

[0048] Among them, the number is at least one or more.

[0049] Analyze the specific type of this pipe according to the number of pipes connected to the inlet pipe point of any pipe; if a single number data is obtained, judge that this pipe is a connecting pipe according to the pipeline database; if two or more number data are obtained, judge that this pipe is a common pipe according to the pipeline database.

[0050] By judging the number of inlet pipe points of any pipeline, specifically determining the type of this pipeline, and thus analyzing which type the flow direction of industrial wastewater upstream of any pipeline belongs to, predicting and analyzing which possible paths exist for the flow direction of industrial wastewater from the starting wastewater inflow pipeline, common pipeline or connecting pipeline to the total wastewater outflow pipeline and then being discharged to the target wastewater treatment plant. These paths include the following, but are not limited to: 1) the shortest flow path; 2) the longest flow path; 3) the fewest common pipelines in the flow path; 4) the most common pipelines in the flow path; 5) other flow paths. Thus, the optimal flow path of industrial wastewater is optimized to make it satisfy the conditions of a short path and a small number of common pipelines.

[0051] S2. Establish a standard wastewater flow direction database: According to the wastewater flow direction paths of the target starting wastewater inflow pipeline and the target wastewater treatment plant, establish a standard wastewater flow direction database, and use the standard wastewater flow direction database as a standard reference to judge whether the flow direction of industrial wastewater in the common pipeline, connecting pipeline and total wastewater outflow pipeline conforms to the standard wastewater flow direction database, so as to obtain the preset standard flow direction path.

[0052] The S2 step also includes the following steps:

[0053] S201. Obtain the discharge positioning data of industrial wastewater and the positioning data of the target wastewater treatment plant, and the positioning data is based on the geographical coordinate data of the positioning module.

[0054] The discharge positioning data of this industrial wastewater specifically refers to the specific position of the outlet pipe point of the end discharge pipe of industrial wastewater in the factory area, that is, the position information of the inlet pipe point of the upstream connecting pipeline of the starting wastewater inflow pipeline; the positioning data of the target wastewater treatment plant is the position information of the outlet pipe point of the total wastewater outflow pipeline of industrial wastewater, that is, the position information of the inlet pipe point of the upstream connecting pipeline entering the wastewater treatment plant.

[0055] Among them, the geographical coordinate positioning data is mainly obtained through a conventional positioning module. The positioning module includes a GPS module or a Beidou satellite guidance system, etc. The positioning data is obtained using the positioning module, and the positioning data is mainly position information, so as to analyze the distance between the discharge positioning data and the positioning data of the target wastewater treatment plant using a conventional processing module according to the position information.

[0056] S202. Analyze the distance between the starting wastewater inflow pipeline and the total wastewater outflow pipeline of industrial wastewater, and obtain multiple wastewater flow direction paths existing between the two.

[0057] S203. Judge whether multiple wastewater flow direction paths exist in the standard wastewater flow direction database.

[0058] Judge the distance between the starting inflow pipe of the wastewater and the total outflow pipe of the wastewater through the geographical coordinate data, that is, the position information of the inlet pipe point of the starting inflow pipe of the wastewater and the position information of the outlet pipe point of the total outflow pipe of the wastewater, analyze the distance between the two, and based on the drainage network database, obtain multiple wastewater flow paths. If there is a coincident flow path P in the multiple wastewater flow paths that coincides with the standard wastewater flow database, then analyze the coincident flow path P in step S203.

[0059] At the same time, step S203 includes: If there is a flow path P with a short distance and a small number of common pipes in the obtained coincident flow path P L , then this flow path P L is the preset standard flow path.

[0060] S3. Analysis of the actual flow path Ⅰ of industrial wastewater to the wastewater treatment plant: According to the pipe point elevation database and the standard wastewater flow database, regard the upper-level pipe of the common pipe as the wastewater source pipe, and the lower-level pipe of the common pipe as the wastewater discharge pipe, and monitor the flow direction of the wastewater in the lower-level pipe, the lower two-level pipes... the lower n-level pipes, and judge whether this flow path is consistent with the standard wastewater flow database.

[0061] If it is consistent, then continue to repeatedly judge the relationship between the flow direction of the next common pipe in its lower-level pipe and the lower two-level pipes and the standard flow database until it is judged that the flow path formed by the industrial wastewater from the last common pipe to the total outflow pipe of the wastewater is the actual flow path P A ;

[0062] If it is inconsistent, transfer to step S4.

[0063] It should be noted that since there are common pipes shared by multiple factory areas in the drainage network for industrial wastewater, and the common pipes are intricately connected with other connecting pipes, the upstream connecting pipes of the common pipes generally have the outlet pipe points of multiple connecting pipes converging at the inlet pipe point of the common pipe.

[0064] Therefore, only analyze the downstream connecting pipes of the common pipe, that is, the actual flow direction in the lower-level pipe, the lower two-level pipes... the lower n-level pipes. At the same time, the lower-level pipe is generally a connecting pipe, the lower two-level pipes are connecting pipes or common pipes, and the upstream and downstream connecting pipes of the common pipe are both connecting pipes. Then the type of the lower two-level pipes needs to specifically analyze the number of pipes connected to the inlet pipe point according to the drainage network database. If the number is one, the type of the lower two-level pipes is a connecting pipe; if the number is two or more, the type of the lower two-level pipes is a common pipe.

[0065] S4. Trace the actual flow path Ⅱ of industrial wastewater in the remaining pipes.

[0066] The steps in S4 also include the following steps:

[0067] S401, Obtain the pressure values when industrial wastewater flows into or out of the pipe points in each pipeline;

[0068] Among them, the pressure value changes with the water velocity, and there is a direct proportional relationship between the two. Therefore, it is possible to analyze whether there is water flow in any pipeline according to the change of pressure.

[0069] S402, When the industrial wastewater flows to the next common pipeline I, judge whether there is a common pipeline N in the next-level pipeline, the next two-level pipelines,..., the next n-level pipelines between the common pipeline I and the target wastewater treatment plant.

[0070] The steps in S402 also include the following steps:

[0071] S4021, If it exists, analyze the specific quantity of the common pipeline N, determine the upper-level pipeline and the lower-level pipeline of each common pipeline N, and determine the positioning data of the common pipeline adjacent to the total wastewater outflow pipeline.

[0072] The end of the total wastewater outflow pipeline is directly connected to the target wastewater treatment plant;

[0073] S4022, If it does not exist, the industrial wastewater will flow through the next n-level pipelines in sequence and be discharged into the target wastewater treatment plant to obtain the actual flow path II'. At this time, all the next n-level pipelines are connected pipelines.

[0074] S403, According to the change of the pressure values of each pipeline, obtain the flow direction of the industrial wastewater from the next-level pipeline, the next two-level pipelines,..., the next n-level pipelines of the common pipeline I to the total wastewater outflow pipeline, and obtain the actual flow path II''.

[0075] S5, Analyze the actual flow path II and the actual flow path P A respectively with the preset standard flow path P L to judge whether there is a flow path P with a short path and few common pipelines among the three T .

[0076] Through analysis by the processing module, mainly analyze the actual flow path II and the actual flow path P A and the preset standard flow path P L to judge whether there is a flow path P with a short path and few common pipelines among them T .

[0077] If it exists, the flow path P T will be recorded in the standard wastewater flow direction database;

[0078] If it does not exist, the actual flow path P AAs the optimized industrial wastewater flow path.

[0079] Specifically, step S5 mainly processes the actual flow path II and the actual flow path P. A Respectively with the preset standard flow path P L The distance between them and the number of common channels are judged and analyzed, and the flow path P with short path distance and few common channels is selected. T It is included in the standard wastewater flow database for the next actual discharge of industrial wastewater. T If the path does not exist, the actual flow will be to path P A The next actual path discharge is carried out as the optimal flow path.

[0080] It should be noted that the actual flow path II here includes the actual flow path II' and the actual flow path II'', which are judged and analyzed separately.

[0081] The processing module used in this application is a conventional analysis module, which will not be elaborated here. You can choose a suitable analysis module according to actual needs. At the same time, the pressure value is mainly monitored by the pressure sensors set at each pipe point, and obtained by setting up an acquisition module. The acquisition module also transmits the pressure value information to the processing module for analysis and judgment.

[0082] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for optimizing the flow direction of industrial wastewater in a drainage network, characterized in that: The following steps are involved: S1, establishing a pipe point elevation database: establishing a drainage pipe network database according to the pipeline data of the pipe points, wherein the drainage pipe network includes a wastewater starting inflow pipe, a common pipe, a wastewater total outflow pipe, and the rest are connected pipes, each pipe includes an inlet pipe point and an outlet pipe point, obtaining the elevation information of each pipe point, and establishing a pipe point elevation database; S2, establish a standard wastewater flow direction database: according to the wastewater flow path of the target wastewater starting inflow pipeline and the target wastewater treatment plant, establish a standard wastewater flow direction database, use the standard wastewater flow direction database as a standard reference, judge whether the flow direction of industrial wastewater in the common pipeline, the connecting pipeline and the total wastewater outflow pipeline conforms to the standard wastewater flow direction database, and obtain a preset standard flow direction path; S3, analysis of the actual flow path of industrial wastewater to the wastewater treatment plant I: according to the pipe point elevation database and the standard wastewater flow direction database, the upper-level pipe of the common pipe is used as the wastewater source pipe, and the lower-level pipe of the common pipe is used as the wastewater discharge pipe, and the flow direction of the wastewater in the lower-level pipe, the lower two-level pipe... the lower n-level pipe is monitored to determine whether this flow path is consistent with the standard wastewater flow direction database; If they are consistent, the relationship between the flow direction of the next common pipeline in the next pipeline and the next two pipelines and the standard flow direction database is repeatedly determined until the flow path formed by the industrial wastewater from the last common pipeline to the total wastewater outflow pipeline is determined to be the actual flow path P. A ; If they are inconsistent, go to step S4; S4, tracing the actual flow path of industrial wastewater in the remaining pipelines II; S5, analysis of actual flow path II, actual flow path P A The relationship between the three and the preset standard flow path is used to determine whether there is a flow path P with a short path and few common pipes among the three. T ; The step S5 also includes the following steps: S501, if it exists, flow to path P T Included in the standard wastewater flow database; S502, if it does not exist, then the actual flow path P A As the optimized industrial wastewater flow path.

2. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 1, characterized in that: According to the elevation information of the pipe point, determine whether the pipe point here is an entry pipe point or an exit pipe point.

3. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 2, characterized in that: In step S1, the drainage network database includes: the number of pipes connected to the inlet pipe point of any pipe; Among them, the number is at least one or more.

4. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 3, characterized in that: The specific type of the pipeline is analyzed based on the number of pipelines connected to the inlet pipe point of any pipeline; if one quantity data is obtained, the pipeline is judged to be a connected pipeline based on the pipeline database; if two or more quantity data are obtained, the pipeline is judged to be a common pipeline based on the pipeline database.

5. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 3, characterized in that: The step S2 also includes the following steps: S201, obtaining discharge positioning data of industrial wastewater and positioning data of a target wastewater treatment plant, wherein the positioning data is based on geographic coordinate data of a positioning module; S202, analyzing the distance between the wastewater starting inflow pipe and the wastewater total outflow pipe of the industrial wastewater, and obtaining multiple wastewater flow paths between the two; S203, determining whether the plurality of wastewater flow paths exist in the standard wastewater flow database.

6. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 5, characterized in that: The distance between the wastewater starting inflow pipe and the wastewater total outflow pipe is determined by geographic coordinate data.

7. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 5, characterized in that: In the step S203, if there is a flow path P with a short distance and a small number of common pipes among the overlapping flow paths P, L , then this flow path P L It is the preset standard flow path.

8. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 7, characterized in that: The step S4 also includes the following steps: S401, obtaining the pressure value of industrial wastewater flowing into or out of each pipe; S402, when the industrial wastewater flows to the next common pipeline I, determine whether there is a common pipeline N in the next pipeline, the next two pipelines, ... the next n pipelines between the common pipeline I and the target wastewater treatment plant; S403, according to the changes in the pressure values ​​of each pipeline, the flow direction of the industrial wastewater in the next pipeline, the next two pipelines, ... the next n pipelines of the common pipeline I to the total wastewater outflow pipeline is obtained to obtain the actual flow path II'.

9. A method for optimizing the flow direction of industrial wastewater in a drainage network according to claim 8, characterized in that: The step S402 also includes the following steps: S4021, if it exists, analyze the specific number of common pipes N, determine the upper-level pipe and the lower-level pipe of each common pipe N, and determine the location data of the common pipes that are close to the total wastewater outflow pipe; The end of the wastewater total outflow pipeline is directly connected to the target wastewater treatment plant; S4022, if it does not exist, the industrial wastewater will be discharged to the target wastewater treatment plant through the next n-level pipelines in sequence, and the actual flow path II will be obtained.

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