Research progress on in situ remediation of halogenated hydrocarbon contamination in groundwater by persulfate-based advanced oxidation process
The groundwater contamination by halogenated hydrocarbons has gained increasing attention in recent years.Among various available remediation technologies,persulfate(PS)-based advanced oxidation processes have become a promising option in the water treatment community due to their high oxidation capacity,wide range of applicable pH,and long half-life with a wide range of oxidation.In this review,the types of halogenated hydrocarbons commonly detected in groundwater were classified,and dense non-aqueous phase liquids(DNAPLs)were the most frequently detected type of halogenated hydrocarbons in domestically contaminated sites.Next,statistics were presented regarding the types and frequencies of halogenated hydrocarbons identified in a total of 155 sampled contaminated areas.Additionally,this review included a detailed analysis of the degradation mechanism of PS-based advanced oxidation processes,which was categorized into two pathways:free radical and non-free radical.Given the low activity of single PS,activation was required to achieve optimal oxidation performance,and this review summarized the properties and characteristics of metal-based and carbon-based catalysts.Lastly,the effects of various factors on the reaction in specific applications were discussed,including PS concentration,inorganic anions,initial pH of the reaction,and the presence of natural organic matter in groundwater.PS-based advanced oxidation processes had the potential to be an efficient and environmentally friendly alternative to conventional groundwater halogenated hydrocarbon remediation technologies.
万方数据
维普
