摘要
Chlorination plays a vital role in guaranteeing the safety of reused stormwater,but it must be carefully managed due to its potential to react with dissolved organic matter(DOM)in water,forming disinfection by-products(DBPs).This study investigated DOM characteristics in stormwater from different land uses.The results showed that surrounding environments significantly impacted DOM characteristics in stormwater.Commercial stormwater and highway stormwater showed higher DOM concentrations with higher aromaticity than urban village and residential areas.DOM in commercial stormwater and highway stormwater had a high humification while residential stormwater and urban village stormwater had a higher fraction of recently microbially-generated DOM.When compared to other water sources in China,stormwater(rainwater that reaches the ground and washes off pollutants)/rainwater(rainwater without reaching ground surfaces)exhibited higher humification and fewer extracellular substances produced by microorganisms.Stormwater/rainwater was also more hydrophilic,with percentages ranging from 50.77%to 93.73%.However,all water sources contained a significant fraction of low molecular weight DOM,such as<1 kDa,with stormwater in this study containing 36.45%to 66.39%of DOM<1 kDa.These findings provide valuable insights into the DOM characteristics of stormwater.
基金
supported by the National Natural Science Foundation of China(No.U21A2036 and 52170100)
Guangdong Basic and Applied Basic Research Foundation(No.2024A1515010371)
Shenzhen Science and Technology Program(No.JCYJ20240813141507010).
