摘要

    将三种氧化剂（次氯酸钠[NaClO]，臭氧和紫外线）与粉末状活性炭（PAC）和超滤（UF）结合使用，以对污水处理厂的二次废水进行深度处理。这项研究调查了组合过程中的最佳氧化剂剂量，测试了二级流出物中抗生素抗性基因（ARG）的去除效率，并探讨了三种组合过程去除二级流出物中与细胞相关和无细胞的ARG的方法。 。结果表明，这三种组合工艺可以有效减少次要废水中的ARGs。 NaClO-PAC-UF工艺去除了二级出水中的3.02-4.07-log ARG（tetA，tetC，tetG，sulI，sulII），I类整合素整合酶（intI1）和16S rRNA，还原效果最佳。在三个预氧化-PAC-UF合并过程的膜流出物中未检测到细胞相关的ARG。 NaClO-PAC-UF组合工艺对无细胞ARG的去除效果最佳，去除量为3.02–3.28-log。可以将三种氧化剂与PAC和UF结合使用，以有效降低二次废水中的ARGs。

    Three oxidants (sodium hypochlorite [NaClO], ozone, and ultraviolet rays) were combined with powdered activated carbon (PAC) and ultrafiltration (UF) for advanced treatment of the secondary effluent of sewage treatment plants. This study investigated the optimal oxidant dosing in the combined process, tested the removal efficiency of antibiotic resistance genes (ARGs) in the secondary effluent, and explored the removal of cell-associated and cell-free ARGs in the secondary effluent by the three combined processes. The results showed that the three combined processes could effectively reduce ARGs in the secondary effluent. The NaClO-PAC-UF process removed 3.02–4.07-log of ARGs (tetA, tetC, tetG, sulI, sulII), Class I integron-integrase (intI1) and 16S rRNA in the secondary effluent with the best reduction effect. Cell-associated ARGs were not detected in the membrane effluent of the three preoxidation-PAC-UF combined processes. The NaClO-PAC-UF combined process had the best removal effect on cell-free ARGs with a removal amount of 3.02–3.28-log. The three oxidants combined with PAC and UF can be used as a combined process to effectively reduce ARGs in secondary effluent.

    https://www.liebertpub.com/doi/abs/10.1089/ees.2020.0525