粉末活性炭-膜生物反应器（PAC-MBR）：高 PAC 浓度对微污染物去除和微生物群落的影响。
Powdered activated carbon - Membrane bioreactor (PAC-MBR): Impacts of high PAC concentration on micropollutant removal and microbial communities.
机构信息
Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China.
Institute of Environmental Engineering & Nano-Technology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China.
出版信息
Sci Total Environ. 2020 Nov 25;745:141090. doi: 10.1016/j.scitotenv.2020.141090. Epub 2020 Jul 23.
In this study, the effect of a high concentration of powdered activated carbon (PAC) on pollutant removal and microbial communities was systematically investigated. Micropollutant removal by the 'control' MBR (without PAC addition) was pollutant-specific and was mainly controlled by their molecular properties. The PAC-MBR achieved enhanced removal of micropollutant by 10% (ofloxacin) to 40% (caffeine). Analysis of the microbial communities in the sludge samples collected from both MBRs indicated an increase in the abundance of 24 (out of 31) genera following PAC addition. Notably, bacterial diversity enriched, particularly in the anoxic zone of the PAC-MBR, indicating a positive impact of recirculating mixed liquor containing PAC from the aerobic to the anoxic zone. In addition, PAC improved the abundance of Comamonas and Methanomethylovorans (up to 2.5%) that can degrade recalcitrant micropollutants. According to the quantitative PCR (qPCR) analysis, the copies of functional genes (nirS, nosZ and narG) increased in PAC-MBR. This study demonstrated that MBR could be operated at a high PAC concentration without compromising the pollutant removal and microbial community evolution during wastewater treatment.
在这项研究中，系统研究了高浓度粉末活性炭（PAC）对污染物去除和微生物群落的影响。“对照”MBR（未添加 PAC）对微污染物的去除具有污染物特异性，主要受其分子特性控制。PAC-MBR 通过 10%（氧氟沙星）到 40%（咖啡因）的方式增强了微污染物的去除。对从两个 MBR 收集的污泥样本中的微生物群落进行分析表明，添加 PAC 后，24 个（31 个中的 24 个）属的丰度增加。值得注意的是，细菌多样性得到了丰富，特别是在 PAC-MBR 的缺氧区，表明含有 PAC 的回流混合液从好氧区循环到缺氧区具有积极影响。此外，PAC 提高了能够降解难降解微污染物的 Comamonas 和 Methanomethylovorans 的丰度（高达 2.5%）。根据定量 PCR（qPCR）分析，PAC-MBR 中的功能基因（nirS、nosZ 和 narG）的拷贝数增加。本研究表明，在不影响污水处理中污染物去除和微生物群落进化的情况下，MBR 可以在高 PAC 浓度下运行。
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