磺胺甲恶唑和土霉素对强化生物除磷及细菌群落结构的影响。
Effect of sulfamethoxazole and oxytetracycline on enhanced biological phosphorus removal and bacterial community structure.
机构信息
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0512, USA.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
出版信息
Bioresour Technol. 2021 Jan;319:124067. doi: 10.1016/j.biortech.2020.124067. Epub 2020 Sep 2.
The individual and combined effects of sulfamethoxazole (SMX) and oxytetracycline (OTC) on an enhanced biological phosphorus removal (EBPR) system was investigated. OTC at 5 mg/L resulted in filamentous bulking with a collapse of EBPR system. P removal decreased to 44.8% and COD was mostly removed during the aerobic phase. SMX and OTC had antagonistic effects in EBPR system. The inhibitory effect of SMX and SMX + OTC on P removal, COD removal, glycogen transformation and extracellular polymeric substances content was reversible with prolonged operation, accompanied with increase of polyphosphate accumulating organisms. The presence of nitrification inhibitor allylthiourea, high pH and low tetX abundance limited the removal of SMX and OTC. The bacterial community structure, antibiotic resistance genes abundances and genes functions were also investigated by metagenomic analysis. The results of this study offer insights into the individual and combined environmental risks of SMX and OTC, and their impact on EBPR.
研究了磺胺甲恶唑（SMX）和土霉素（OTC）单独及联合作用对强化生物除磷（EBPR）系统的影响。5mg/L 的 OTC 导致丝状菌膨胀，EBPR 系统崩溃。磷去除率降至 44.8%，好氧阶段主要去除 COD。SMX 和 OTC 在 EBPR 系统中具有拮抗作用。SMX 和 SMX+OTC 对磷去除、COD 去除、糖原转化和胞外聚合物含量的抑制作用具有可逆性，伴随着聚磷菌的增加。硝化抑制剂烯丙基硫脲、高 pH 值和低 tetX 丰度限制了 SMX 和 OTC 的去除。通过宏基因组分析还研究了细菌群落结构、抗生素抗性基因丰度和基因功能。本研究结果深入了解了 SMX 和 OTC 的单独和联合环境风险及其对 EBPR 的影响。
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