Method for measuring in-situ simulated water quality in pipe network under water source switching condition

Abstract

The invention provides a method for measuring in-situ simulated water quality in a pipe network under a water source switching condition. The method comprises the following steps: through separation treatment to a selected pipe section of a water supply system, an in-situ test pipe section, used for testing, of the water supply system is obtained, then testing is performed on the in-situ test pipe section, and detection is performed on water quality of each of local water of the water supply system and to-be-switched replacement water used for replacing the local water, so that a result about change of a water quality parameter under water source switching is obtained. According to the method provided by the invention, part of pipe sections are separated on an existing pipe, and test pipes do not need to be digged out completely, so that excavation workload is reduced, improvement cost is low, pipe sections in the excavation-limited area can be still tested, movement of the pipe sections is avoided, influence on existing physical, chemical and microbiological systems in the pipe is small, and obtained test data can fully simulate the situation about change of water quality in the existing pipe under the water source switching condition, which has very important guiding significance in stability of water quality in the water supply pipe network under the predicted water source switching condition.

Description

technical field [0001] The invention belongs to the field of safe transmission and distribution of pipe networks in drinking water treatment, and in particular relates to a method for measuring water quality of pipe networks under in-situ simulated water source switching conditions. Background technique [0002] With the development of society and economy, people's demand for water resources, especially drinking water resources, is increasing day by day. The protection of drinking water quality has always been a hot spot in the water supply industry. To ensure the safety of drinking water, the entire system from the water source to the user's faucet needs to be considered comprehensively. Among them, the pipeline network transmission and distribution is a key link in the water supply process. The stability during the distribution process determines the quality of the water at the user end. [0003] During the long-term operation of the water supply network, due to corrosion...

AI Technical Summary

Problems solved by technology

[0006] Since the generation and release of corrosion products in the water supply pipe network is a complex reaction process, including physical, chemical, biological and other effects, during the process of cutting and sampling the pipe section and bringing it back to the laboratory, due to unavoidable vibration, oxidation and other reasons, It will affect the original form of corrosion products and microorganisms in the pipeline, thereby affecting the accuracy of test results

After the pipe section is brought back to the laboratory, if the length of the pipe section is not enough, it will be difficult to simulate the water flow state in the actual pipe network. The water flow in the actual pipe section is axial, and the pipe scale will have certain characteristics under the influence of such a long-term water flow direction , if the horizontal circulation generated by stirring is used to approximate the longitudinal water flow conditions in the actual feed-back pipeline, the direction of the water flow does not match the direction of the water flow in the original pipe section. When chemical reactions with pipe scale occur, the reaction rate and equilibrium conditions will be There may be a big difference between the test results and the actual water quality changes

At the same time, since most of the active tap water supply pipe networks are buried underground, the ground needs to be excavated for pipe section sampling, and the length and location of sampling are limited by various objective conditions such as ground buildings.

Images