摘要

       本研究考察了超声（US）、臭氧和US联合臭氧（US/ozone）预处理对肠道指示菌和抗生素抗性基因（ARGs）的去向以及乳品废水厌氧消化（AD）的影响。 .预处理条件包括美国功率 200 W，臭氧浓度 4.2 mg O3/L，预处理时间 0-30 分钟。结果表明，US/臭氧预处理可有效灭活肠道指示菌。在 US/臭氧预处理 30 分钟后，总大肠菌群和肠球菌分别减少了 99% 和 92%。预处理不能降低 ARGs 的绝对浓度，但可以降低 ARGs 的相对丰度。在随后的 AD 过程中，使用 20 分钟的臭氧或 20 分钟的 US/臭氧预处理，甲烷产量增加了 10% 以上。预处理-AD一起明显抑制了ARGs相对丰度的富集。该研究为提高甲烷产量和防止 ARGs 富集提供了一种预处理方法。

       In this study, the effect of ultrasound (US), ozone and US combined with ozone (US/ozone) pretreatments on the fate of enteric indicator bacteria and antibiotic resistance genes (ARGs), and anaerobic digestion (AD) of dairy wastewater was investigated. The pretreatment conditions included US power 200 W, ozone concentration 4.2 mg O3/L, and pretreatment time 0–30 min. The results showed that US/ozone pretreatment was effective in the inactivation of enteric indicator bacteria. Total coliforms and enterococci were reduced by 99% and 92% after 30 min US/ozone pretreatment. Pretreatments could not decrease ARGs in absolute concentration, but could decrease ARGs in relative abundance. In the subsequent AD process, methane production increased more than 10% with 20 min ozone or 20 min US/ozone pretreatments. Pretreatment-AD together obviously inhibited the enrichment of ARGs in relative abundance. This study provided a pretreatment way to enhance methane production and to prevent the enrichment of ARGs.

https://www.sciencedirect.com/science/article/abs/pii/S0960852420316308