Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
Sci Total Environ. 2021 Jul 1;776:145951. doi: 10.1016/j.scitotenv.2021.145951. Epub 2021 Feb 18.
Both hospital effluent and a model sewage treatment plant (STP) wastewater prepared by mixing STP influent and STP secondary effluent at a volume ratio of 1:9 were directly treated with chlorine for investigation of their effects on disinfection of antimicrobial-resistant bacteria (AMRB) and antimicrobial-susceptible bacteria (AMSB). The overall results indicate that the chlorine disinfection effectively inactivated the majority of AMRB and AMSB, expect for MRSA and Staphylococcus aureus in both wastewaters. No significant differences could further be observed in the taxonomic diversity of micro-organisms after the treatment. The degrees of disinfection given by the direct chlorination were comparable to those attained by combination of conventional activated sludge process and additional chlorine treatment at the STP. The results of this study evoked a recommendation to operate local chlorination treatment directly for the wastewater from medicinal facilities prior to its flow into the STP as sewage. Although additional disinfection treatment at the STP seems necessary to remove the recalcitrant MRSA and Staphylococcus aureus, the present study desirably contributes to a great reduction of the loads of STP and urgent prevention of spreading of infectious diseases in the present state.
医院污水和模型污水处理厂（STP）废水均未经预处理，直接用氯气进行处理，以研究其对抗菌药物耐药菌（AMRB）和抗菌药物敏感菌（AMSB）的消毒效果。混合 STP 进水和 STP 二级出水，体积比为 1:9 来制备模型污水处理厂废水。结果表明，氯气消毒可有效灭活大多数 AMRB 和 AMSB，除了两种废水中的耐甲氧西林金黄色葡萄球菌（MRSA）和金黄色葡萄球菌。处理后，微生物的分类多样性没有明显差异。直接氯化的消毒程度与 STP 中常规活性污泥法和额外氯处理相结合的消毒程度相当。本研究建议在医疗设施废水流入 STP 作为污水之前，在当地直接进行氯化处理。尽管 STP 似乎需要额外的消毒处理来去除顽固的耐甲氧西林金黄色葡萄球菌和金黄色葡萄球菌，但本研究有助于大大减少 STP 的负荷，并在当前状态下紧急预防传染病的传播。
