Research And Application Of Comprehensive Treatment Technology For Black Smelly Water Bodies In Liaojia River

With the rapid development of cities,the discharge of pollutants exceeds the environmental capacity,resulting in the pollution of urban rivers,the reduction of aquatic organisms,the serious degradation of the structure and function of river ecosystems,and the formation of a large number of black smelly water bodies over time,and the eutrophication of black smelly rivers seriously threatens the health and ecological safety of urban residents.Therefore,the treatment of black smelly water bodies has gradually become a real problem for cities today.The self-purification ability of water bodies has limitations,and the problem of black smelly water bodies requires corresponding artificial interventions for effective treatment.Common treatment methods include physical purification,chemical purification,biological purification,etc.This paper first analyzes the causes and treatment methods of black smelly water bodies,and clarifies the evaluation criteria of black smelly water bodies.Subsequently,the current situation research and monitoring results analysis were conducted for the water quality of Liaojia River,and the main causes of pollution were analyzed.Dissolved oxygen in water is the basic condition for aquatic organisms to survive and self-purify.Aeration is one of the most important engineering elements in water purification,and three types of aeration equipment are used in this pilot project:micro-nano aerator,push-flow aerator,and jet aerator.The operation results show that the micro-nano aerator has the best treatment effect.Using micro-nano bubbles instead of traditional bubble aeration not only forms a highly dispersed gas-liquid interface in the water,which plays a good role in air-floating water purification and organic pollutant oxidation,but also greatly improves the oxygenation efficiency.Biofilm technology with its rich microbial community structure is gradually applied in the field of water bioremediation.Through the comparison of three aeration devices and biofilm filler tests,an efficient and low consumption sustainable combination of micro-nano aeration and carbon fiber grass was found,which provides a reference for similar cities to treat black smelly river water.In this study,a combination of source control and pollution interception,aeration and biofilm technology was used for in-situ treatment of the black smelly river section of the Liaojia River tributary in Xinyu City according to the actual situation on site.After the stabilization of the project treatment,it was found that the transparency growth rate was about 394%～476%,dissolved oxygen increase rate was about 5469%～6559%,ORP increase rate was about 167%～177%,NH₃-N reduction rate was about 44%～46%,COD reduction rate was about 83.8%～88.6%,and BOD₅reduction rate was about 74.9%～81.8%.Therefore,this has practical application value.