The treatment of black and smelly rivers takes the source as the root, and the key root lies in the treatment of pollution sources that cause the black and smelly rivers. With the acceleration of urbanization, rapid economic development, and population increase, some problems in the early urban planning development and construction have gradually emerged, such as the lag in the construction of sewage pipelines, the intersection of rain and sewage pipelines, and the processing capacity of municipal sewage treatment plants. If the scale requirements are not met, the treated water discharged by the sewage treatment plant will cause secondary pollution due to substandard water quality. These problems need to be solved by corresponding engineering measures, usually through sewage disposal pipes, new sewage treatment plants, and sewage Treatment plant technology upgrade and other means to solve.
After solving the source problem, how to restore the ecological purification system of the river water body is the second difficulty. The continuous release of organic pollutants from polluted river sediments is an important source of water quality. Therefore, conventionally, river dredging is the second step of engineering measures, which is the removal of polluted river sediments. Generally speaking, 60%-80% of the bottom sludge can be solved by engineering measures, and the remaining part can be decomposed by bottom sludge-improving microorganisms to effectively degrade and control the release of pollution sources from the bottom sludge.
The third step is to artificially build a water ecosystem. Aeration is used to restore dissolved oxygen in the water body, restore the microbial community in the water body, activate the indigenous microorganisms, and build a relatively complete but weak ecosystem in the short term by introducing various aquatic organisms in the water ecosystem, and later through human intervention , Constantly consolidate the stability of the ecosystem. After years or even decades of cultivation, a basically stable ecosystem can be formed. In the process of building an ecosystem, aeration, ecological floating beds, aquatic ecological corridors, submerged plants, benthic animals, floating plants, artificial wetlands, etc. will be introduced into the aquatic ecosystem.