摘要
      垃圾渗滤液反渗透浓缩物（LLROC）含有大量难降解有机物、抗生素和抗生素抗性基因（ARGs），处置不当将对当地生态环境构成潜在威胁。在本研究中，使用颗粒活性炭催化臭氧（GAC/O3）系统同时降解LLROC中的多种新污染物。当4 g/L的GAC、80 mg/min的O3、初始pH为7.65、55.7%的COD和77.3%的UV254在反应30min内降解时，GAC/O3体系对难降解有机物的去除效率最佳。在最佳条件下，氧氟沙星、依诺沙星、阿奇霉素和四环素的降解率分别为95.7%、83.6%、98.5%和100.0%。此外，大约80-100%的典型ARG，包括erm35、ermB、tetL和dfrA1，被有效去除。羟基自由基（HO•）是GAC/O3过程中的主要活性氧，在降解难降解有机物和抗生素以及灭活ARGs方面发挥了重要作用。这一发现表明，GAC/O3系统是一种很有前途的清洁LLROC中多种新出现的污染物的技术。
Abstract
Landfill leachate reverse osmosis concentrate (LLROC) contains a high amount of refractory organics, antibiotics and antibiotic resistance genes (ARGs), and the improper disposal of LLROC would pose a potential threat to local ecological environment. In this study, a granular activated carbon-catalyzed ozone (GAC/O3) system was used to simultaneous degrade multiple emerging contaminants from LLROC. The removal efficiency of refractory organics during GAC/O3 system were optimal when 4 g/L of GAC, 80 mg/min of O3, and initial pH of 7.65, and 55.7% of COD and 77.3% of UV254 were degraded within 30 min reaction. At the optimal conditions, the degradation efficiencies of ofloxacin, enoxacin, azithromycin, and tetracycline were 95.7%, 83.6%, 98.5%, and 100.0%, respectively. Moreover, approximate 80–100% of typical ARGs, including erm35, ermB, tetL, and dfrA1, were effectively removed. Hydroxyl radicals (HO•) was the dominant reactive oxygen species during GAC/O3 process, which played an important role in degrading refractory organics and antibiotics and inactivation ARGs. This finding suggests that GAC/O3 system is a promising technique for cleaning of multiple emerging contaminants from LLROC.

https://www.sciencedirect.com/science/article/abs/pii/S0959652622045899