School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science and Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Bioresour Technol. 2024 Aug;406:131008. doi: 10.1016/j.biortech.2024.131008. Epub 2024 Jun 17.
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 PO-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.
本研究考察了在稳定条件下和三种不同进水碳氮比（C/N）波动水平（±10%、±20%和±30%）下，移动床生物膜反应器中的营养物质去除和微生物群落演替。在进水 C/N 比波动的条件下，COD 和 PO-P 的去除效率分别下降了 4.7-6.4%和 3.7-12.9%，而氮的去除几乎不受影响。从载体生物膜中观察到与氮和磷去除相关的可培养功能细菌（包括亚硝酸盐氧化菌（NOB）、好氧反硝化菌（DNB）和聚磷菌（PAOs））的含量急剧下降。测序分析表明，Candidatus Competibacter 的丰度增加了 10.3-25.9%，成为主要的脱氮菌属，可能表明在进水 C/N 比波动下，硝酸盐通过内源性反硝化作用被去除。上述结果将为高度可变进水条件下分散式污水处理中的营养物质去除提供基础数据。
