Research advances of microbial denitrification and application in black and odorous water

Abstract

High nitrogen content is considered to be one of the main reasons for the black and odor phenomenon in rivers. Microbial denitrification has been widely concerned because of its simple operation, high economic efficiency, short repair time and little impact on the surrounding environment. However, its denitrification process is also affected by environmental factors, pollutants and changes in microbial communities. In this paper, the main bacterium participating in sewage treatment of nitrification, denitrification and anaerobic ammonia oxidation were introduced, and then the adaptation situation and distribution of microbial community in each denitrification process were summarized. Finally, applications and prospects were objectively provided by microbial agents, constructed wetlands and ecological floating islands. According to the existing research results, it is believed that microbial remediation has a broad prospect in the treatment of urban black and odorous water bodies. However, it is difficult to maintain a stable bacterial community structure, denitrification activity and environmental adaptability of microbial remediation technology in river channels, which is the bottleneck of its application in the treatment of black and odorous water.