摘要
      电过氧酮（EP）工艺是一种基于电的氧化工艺，通过在臭氧氧化过程中从阴极氧（O2）还原中电化学产生过氧化氢（H2O2）来实现。在本研究中，比较了单独臭氧处理和EP处理地下水过程中抗生素抗性细菌（ARB）和质粒编码的抗生素抗性基因（ARGs）的去除情况。由于H2O2促进臭氧（O3）转化为羟基自由基（•OH），与单独的臭氧氧化相比，EP过程中获得了更高的•OH暴露，但更低的O3暴露。与单独臭氧氧化相比，O3和•OH暴露的这种相反变化在EP过程中适度降低了ARB失活和ARG降解的效率。这些结果表明，关于ARB失活和ARG降解，当将臭氧氧化改为EP工艺时，O3暴露量的减少可能不会被•OH暴露量的增加完全抵消。然而，由于•OH暴露的增加，在EP过程中，质粒DNA比单独臭氧氧化更有效地切割成更短的片段，这可能会降低ARGs自然转化的风险。这些发现强调，在水处理中实施EP工艺时，需要考虑EP工艺对ARB和ARG失活的影响。
Abstract
The electro-peroxone (EP) process is an electricity-based oxidation process enabled by electrochemically generating hydrogen peroxide (H2O2) from cathodic oxygen (O2) reduction during ozonation. In this study, the removal of antibiotic resistant bacteria (ARB) and plasmid-encoded antibiotic resistance genes (ARGs) during groundwater treatment by ozonation alone and the EP process was compared. Owing to the H2O2-promoted ozone (O3) conversion to hydroxyl radicals (•OH), higher •OH exposures, but lower O3 exposures were obtained during the EP process than ozonation alone. This opposite change of O3 and •OH exposures decreases the efficiency of ARB inactivation and ARG degradation moderately during the EP process compared with ozonation alone. These results suggest that regarding ARB inactivation and ARG degradation, the reduction of O3 exposures may not be fully counterbalanced by the rise of •OH exposures when changing ozonation to the EP process. However, due to the rise of •OH exposure, plasmid DNA was more effectively cleaved to shorter fragments during the EP process than ozonation alone, which may decrease the risks of natural transformation of ARGs. These findings highlight that the influence of the EP process on ARB and ARG inactivation needs to be considered when implementing this process in water treatment.

https://www.sciencedirect.com/science/article/abs/pii/S0045653523003065