A method for determining the location and amount of infiltration of river water and groundwater into sewage pipes

Abstract

The invention discloses a method for determining positions where river water and underground water infiltrate into a sewage pipeline and the infiltration volume. The method comprises the following steps that S10, a monitoring section of a trunk sewer is selected; S20, the ammonia nitrogen concentrations of the river water, the underground water, an upstream monitoring point, a downstream monitoring point and main monitoring points are monitored; and S30, if the ammonia nitrogen difference value of every two adjacent monitoring points is not larger than 5 mg / L, the fact that no infiltration of the river water and the underground water occurs to the monitoring section is indicated; if the decrease value of the ammonia nitrogen concentration of sewage of a certain main monitoring point is larger than 8 mg / L compared with the front monitoring point, the fact that infiltration of the river water and the underground water occurs to the segment where the main monitoring point is monitored is indicated, and sewage flow of the upstream monitoring point and the downstream monitoring point are measured to obtain the infiltration volume; and if linear decrease occurs, the fact that infiltration of the river water and the underground water occurs to all segments of the monitoring section is indicated, the sewage flow of the upstream monitoring point and the downstream monitoring point are measured, and the infiltration volume is obtained through calculation. Through the method, the positions where the river water (the underground water) infiltrate into the sewage pipeline and the infiltration volume can be determined fast and accurately, and the investment and the cost are low.

Description

technical field [0001] The invention is used in the technical field of water quality monitoring, and in particular relates to a method for determining the location and infiltration amount of river water and groundwater infiltration sewage pipes. Background technique [0002] It is a common phenomenon that river water (groundwater) infiltrates into the main sewage pipe, which will lead to an increase in the amount of treated water in the sewage treatment plant. In the design specifications, it is usually considered that the infiltration water is 10% to 20% of the sewage volume, but due to the dry sewage Due to irregular construction and long-term aging of the pipes, the main sewage pipes will be damaged. When these damaged sewage pipes are located in areas with high groundwater levels, a large amount of groundwater will seep into the sewage pipes; when these damaged sewage pipes When the sewage pipe is near the river gushing, it is also vulnerable to the infiltration of a lar...

AI Technical Summary

Problems solved by technology

By monitoring the flow of each section of sewage branch pipe and main pipe, it can calculate the amount of river water (groundwater) infiltration. This method can estimate the total amount of groundwater infiltration, but it is difficult to determine the infiltration location

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