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This article analyzes the factors affecting the nitrification and denitrification sludge granulation, including carbon source abundance, environmental pH, electron acceptors, SRT conditions, reaction temperature, etc. In this paper, the content of impurities in sewage is clarified, and the entire treatment process, COD removal, sludge denitrification and sedimentation, and sludge formation process analysis are analyzed. The purpose is to improve the application value of activated carbon and improve the treatment effect of sewage.