Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Sci Total Environ. 2023 Feb 1;858(Pt 2):159833. doi: 10.1016/j.scitotenv.2022.159833. Epub 2022 Oct 29.
The absence of effective wastewater treatment technology to eliminate emerging pollutants from municipal sewage has become a pressing issue. In this study, the efficacy of a novel modified trickling filter (MTF), conventional activated sludge process (ASP) and two tertiary systems (UV and ozonation) were compared in eliminating antibiotic-resistant bacteria (ARB), antibiotic resistance genes (ARGs) and pharmaceuticals and personal care products (PPCPs) from urban sewage. MTF and ASP resulted in >1 log unit reduction in the abundance of ARB, while for ARGs, the removal was observed in the range of 0.1 to 1.7 log units. In MTF, ARGs were substantially removed in the aerobic zone compared to the anoxic zone. The relative abundance of most of the ARGs either decreased or remained unchanged during MTF and ASP operations. However, the relative abundance of most of the ARGs increased in the secondary sludge generated from ASP. The concentration of PPCPs such as atenolol, sulfamethazine, triclosan, and ranitidine was reduced by MTF by >80 %. Overall, the results indicated that MTF followed by ozonation is the most effective combination for removing emerging contaminants from municipal sewage.
缺乏能够有效去除城市污水中新兴污染物的废水处理技术已成为一个紧迫问题。本研究对比了新型改良滴滤池（MTF）、传统活性污泥工艺（ASP）和两种三级处理系统（UV 和臭氧）对城市污水中抗生素耐药菌（ARB）、抗生素耐药基因（ARGs）和药物及个人护理产品（PPCPs）的去除效果。MTF 和 ASP 使 ARB 的丰度降低了 >1 个对数单位，而 ARGs 的去除率在 0.1 到 1.7 个对数单位之间。在 MTF 中，与缺氧区相比，好氧区的 ARGs 去除效果显著。在 MTF 和 ASP 运行过程中，大多数 ARGs 的相对丰度要么降低，要么保持不变。然而，大多数 ARGs 的相对丰度在 ASP 产生的二级污泥中增加。MTF 可使阿替洛尔、磺胺甲噁唑、三氯生和雷尼替丁等 PPCPs 的浓度降低 >80%。总体而言，结果表明，MTF 结合臭氧处理是去除城市污水中新兴污染物最有效的组合。
