The influencing mechanism of molecular composition of dissolved organic matter on the formation of disinfection byproducts mediated by reactive chlorine species
Dissolved organic matter(DOM)reacts with reactive chlorine species(Cl·and Cl2·-)during UV/chlor ine(amine)advanced oxidation processes to form disinfection byproducts(DBPs),which affect the toxicity and safety of water quality.In this study,the formation and toxicity of DBPs during the reaction between Cl·or Cl2·-and DOM with different origins were investigated,and the relationship between the molecular composition of DOM and the properties of formed DBPs such as concentration,species and toxicity was explored.The results showed that the main contributors to DBPs formation and toxicity were trihalomethanes(THMs)and haloacetaldehydes(HALs)during the reaction between Cl·and DOM.The poor correlation between the molecular composition of DOM and the mass concentrations,species,and toxicity of DBPs may be attributed to the similar reactivity between Cl·and different DOMs.In contrast,HAAs were the main contributors to the generation of DBPs and non-regulated DBPs were the main contributors to toxicity of DBPs during the reaction between Cl2·-and DOM.In addition,the mass concentration,species and toxicity of DBPs were negatively correlated with the unsaturation,aromaticity,oxygen content and polarity of DOM,and positively correlated with the relative content of N,S and P compounds in DOM.This study promotes the research on the formation of DBPs caused by DOM reacting with a single reactive chlorine species,and provides reference for parameter optimization of AOP and the reduction of DBPs formation and toxicity.
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