School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, China.
Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Bioresour Technol. 2019 Sep;288:121592. doi: 10.1016/j.biortech.2019.121592. Epub 2019 Jun 1.
This study investigated sulfamethoxazole (SMX) removal and fate in sulfate-reducing up-flow sludge bed (SRUSB) reactors inoculated with sulfate-reducing bacteria (SRB) granules and flocs. The resilience of SRB granules and flocs against varying pHs and hydraulic retention times (HRTs) was also examined. SRB granules and flocs efficiently removed SMX from wastewater, which was significantly higher than the aerobic sludge. SRB granules achieved significantly (p < 0.05) higher SMX removal (∼13.3 μg/g suspended solids (SS)-d) than the SRB flocs (∼11.2 μg/g SS-d) during 150-day of SRUSB reactors operation. The SMX removal by both granules and flocs was mainly attributed to biodegradation. Sorption also contributed to SMX removal, in which aromatic protein-like substances of extracellular polymeric substances played important role in SMX removal. In addition, SRB granules showed higher resilience than SRB flocs against varying pHs and HRTs. Thus, SRB-mediated biological process, especially SRB granules, could be a promising biotechnology to remove SMX from wastewaters.
本研究考察了接种硫酸盐还原菌（SRB）颗粒和絮体的硫酸盐还原上流污泥床（SRUSB）反应器中磺胺甲恶唑（SMX）的去除和归宿。还研究了 SRB 颗粒和絮体对不同 pH 值和水力停留时间（HRT）的弹性。SRB 颗粒和絮体可有效去除废水中的 SMX，其去除效率明显高于好氧污泥。在 150 天的 SRUSB 反应器运行过程中，SRB 颗粒的 SMX 去除率（约 13.3μg/g 悬浮固体（SS）-d）明显高于 SRB 絮体（约 11.2μg/g SS-d）（p<0.05）。颗粒和絮体对 SMX 的去除主要归因于生物降解。吸附也有助于 SMX 的去除，其中细胞外聚合物中的芳香蛋白样物质在 SMX 的去除中起重要作用。此外，与 SRB 絮体相比，SRB 颗粒在不同 pH 值和 HRT 下表现出更高的弹性。因此，SRB 介导的生物过程，特别是 SRB 颗粒，可能是从废水中去除 SMX 的一种很有前途的生物技术。
