反硝化细菌
反硝化
生物膜
氮气
营养物
微生物种群生物学
移动床生物膜反应器
硝酸盐
亚硝酸盐
环境科学
环境化学
碳氮比
废水
环境工程
化学
污水处理
磷
细菌
生物
有机化学
遗传学
作者
Jie Liang,Chong-Miao Zhang,Yin-Xiang Cao
标识
DOI:10.1016/j.biortech.2024.131008
摘要
This study investigated the nutrient removal and microbial community succession in moving bed biofilm reactor under stable and three levels of influent carbon/nitrogen (C/N) ratio fluctuation (±10 %, ± 20 %, and ± 30 %). Under the conditions of influent C/N ratio fluctuation, the removal efficiency of COD and PO43--P decreased 4.7 %-6.4 % and 3.7 %-12.9 %, respectively, while the nitrogen removal was almost unaffected. A sharp decrease in the content of culturable functional bacteria related to nitrogen and phosphorus removal including nitrite-oxidizing bacteria (NOB), aerobic denitrifying bacteria (DNB), and polyphosphate-accumulating organisms (PAOs) from the carrier biofilm was observed. Sequencing analysis revealed that the abundance of Candidatus Competibacter increased 10.3 %-25.9 % and became the dominant genus responsible for denitrification, potentially indicating that nitrate was removed via endogenous denitrification under the influent C/N ratio fluctuation. The above results will provide basic data for the nutrient removal in decentralized wastewater treatment under highly variable influent conditions.
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