China’s rural sewage has the characteristics of large fluctuation of water quality and quantity, low carbon-nitrogen ratio, and low treatment efficiency of traditional processes at low temperature, which is difficult to meet the treatment needs. In this study, Microbial Immobilization Technology (MIT) was used to prepare immobilized biological fillers to improve the operation stability and treatment efficiency of the system under low temperature conditions. Based on the existing rural sewage collection tank reconstruction test device (design capacity 3 m3/h)-N, the system treatment efficiency at 8˚C - 19.3˚C was investigated, and the microbial community structure was analyzed by high-throughput sequencing. The results showed that the average removal rate of NH4-N was 93.43% and the average removal rate of COD was 82.25% in the low temperature cycle. The effluent concentrations were 0.65 mg/L and 24.97 mg/L, respectively. The effluent quality was better than the Class IV standard of “Surface Water Environmental Quality Standard” (GB3838-2002). The microbial community structure was highly matched with the process function. The microbial community analysis showed that the dominant bacteria in each functional pool in the embedded filler were clear, the structure was stable, and good metabolic activity was maintained under low temperature conditions. The embedded filler exhibits high biological activity and stress resistance. This study provides theoretical support and engineering reference for the practical application of microbial embedding immobilization technology in low-temperature rural sewage treatment.
Cite this paper
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