摘要

       在这项研究中，建立了三个厌氧消化实验来研究固体保留时间 (SRT) 对抗生素抗性基因 (ARG) 命运的影响，包括污水污泥的厌氧消化 (CK)、微波预处理污泥的一级厌氧消化 (MW) 和微波预处理污泥的两阶段厌氧消化（酸阶段和 CH4 阶段）。 ARG 对 SRT 的响应因 ARG 类型和反应器配置而异。 较短的 SRT 可以利用 CK 和两阶段消化的 ARGs 减少，而 MW 需要较长的 SRT 来减少 ARGs。 关于由反应器配置引起的微生物群落的变化，SRT 的作用是有限的。 部分冗余分析和结构方程模型分析表明，SRT 对 ARGs 命运的作用最可归因于重金属的共同选择。 

       In this study, three anaerobic digestion experiments were established to investigate the effects of solids retention times (SRT) on the fate of antibiotic resistance genes (ARGs) including anaerobic digestion of sewage sludge (CK), one-stage anaerobic digestion of microwave pretreatment sludge (MW) and two-stage anaerobic digestion of microwave pretreatment sludge (Acid stage and CH4 stage). The response of ARGs to the SRT varied significantly from ARG types and reactor configurations. Shorter SRT could avail the ARGs reduction for CK and two-stage digestion, while MW need longer SRT for the ARGs reduction. Concerning the variance of microbial community caused by reactor configurations, the role of SRT was limited. The partial redundancy analysis and structural equation models analysis indicated that the role of SRT on the ARGs fate could be attributed the most to the co-selection from heavy metals.

https://www.sciencedirect.com/science/article/abs/pii/S0960852418316523