Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China.
Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, 388 Yuhangtang Road, Hangzhou 310058, China.
J Hazard Mater. 2020 Jul 15;394:122583. doi: 10.1016/j.jhazmat.2020.122583. Epub 2020 Mar 27.
The frequent occurrence of pharmaceuticals and personal care products (PPCPs) in domestic wastewater has caused great concern. In this study, the removal of two typical pharmaceuticals (Roxithromycin, ROX; Sulfamethoxazole, SMZ) in aerobic granular sludge (AGS) reactors was investigated under condition of different C/N (carbon to nitrogen) ratios. Results showed that higher removal efficiencies of ROX and SMZ (95.2 % and 92.9 %) were achieved in the AGS reactor fed with low C/N influent. Batch experiments further revealed that the removal of ROX was influenced by the adsorption ability of the AGS while SMZ removal was mainly enhanced by biodegradation process. Analysis of extracellular polymeric substances (EPS) showed that the humic acid-like substances were enriched under low C/N condition, which was in accordance with dynamic change of microbial community. The microbes, like Thauera spp. and Xanthomonadaceae, were highly enriched in the reactor with high nitrogen loading rate and functioned as refractory organics degrader. Overall, the AGS process could achieve enhanced pharmaceuticals removal performance by the regulation of microbial community under low C/N influent, which provides insights into a feasible solution for simultaneous removal of nitrogen and trace organic pollutants in AGS reactor.
在生活废水中频繁出现的药品和个人护理产品（PPCPs）引起了极大的关注。在本研究中，考察了在不同 C/N（碳氮比）条件下好氧颗粒污泥（AGS）反应器中两种典型药品（罗红霉素，ROX；磺胺甲恶唑，SMZ）的去除情况。结果表明，低 C/N 进水条件下，AGS 反应器中 ROX 和 SMZ 的去除效率更高（95.2%和 92.9%）。批式实验进一步表明，ROX 的去除受到 AGS 吸附能力的影响，而 SMZ 的去除主要是通过生物降解过程增强的。对胞外聚合物（EPS）的分析表明，在低 C/N 条件下，富里酸样物质得到了富集，这与微生物群落的动态变化是一致的。在高氮负荷率下，Thauera 属和黄单胞菌科等微生物高度富集，作为难降解有机物的降解菌。总的来说，AGS 工艺可以通过在低 C/N 进水条件下调节微生物群落，实现对药品的强化去除性能，为 AGS 反应器中同时去除氮和痕量有机污染物提供了可行的解决方案。
