Application development of external carbon source in low carbon source sewage treatment based on a large amount of literatures

The influent carbon and nitrogen of most sewage plants in China are relatively low, which affects the anaerobic denitrification process of biological secondary treatment, resulting in high nitrogen content in effluent. Based on big data analysis, this paper analyzes the impact of external carbon sources (traditional carbon source, new solid carbon source and new liquid carbon source) on low-carbon source urban sewage treatment.