复杂碳源对生物膜系统磷富集及微生物群落的影响

来源：中国环境科学杂志2024年第11期北京时间：

作者：毕贞, 付豪, 王雪玲, 袁艺娜, 黄勇

单位：1. 苏州科技大学环境科学与工程学院, 江苏 苏州 215009;2. 苏州科技大学, 城市生活污水资源化利用技术国家地方联合工程实验室, 江苏 苏州 215009

摘要：In this study, the effects of complex carbon sources on the performance of phosphorus enrichment and characteristics of microbial community were investigated in an anaerobic/aerobic alternatively operational biofilm reactor by using synthetic sewage wastewater containing VFAs, glucose and amino acid. The results showed that the utilization efficiency of complex carbon source reached 72.5% by adjusting the parameters of anaerobic hydraulic retention time, aerobic pH and DO concentration. The removal efficiency of total phosphorus and total nitrogen were 99.8% and 76.5%, respectively, with the concentration of phosphorus enrichment solution exceeding 50mg/L. The utilization complex carbon source changed the energy metabolism pathway of biofilm. Specifically, amino acids may participate in phosphorus metabolism as intracellular energy storage substances to compensate for the energy deficiency caused by PHA and glycogen, thus maintaining a good phosphorus removal and enrichment performance of the biofilm system. Meanwhile, the content of intracellular organophosphorus (OP) fluctuated with the activity of phosphorus uptake and release, whereas the content of inorganic poly-phosphorus (IP) changed a little. This phenomenon indicated that the phosphorus metabolism transferred from the IP pathway to the OP pathway. The abundance of hydrolytic bacteria and fermentative bacterium in biofilm increased significantly, which could provide small molecular organic carbon for phosphorus-accumulating bacteria (PAOs) metabolism, thus contribute the satisfactory performance of phosphorus removal and enrichment. The conclusion of present study exhibited the potential of biofilm system to simultaneously realize the phosphorus enrichment and total nitrogen removal via using complex carbon sources in sewage wastewater.

关键词：进水碳源,生物膜,磷富集,城市污水资源化,胞内有机磷

基金资助：国家自然科学基金资助项目(51938010)