Remediation of 2,4-dichlorophenol-contaminated groundwater using nano-sized CaO_(2)in a two-dimensional scale tank  

作　　者：Tianyi Li Chengwu Zhang Jingyi Zhang Song Yan Chuanyu Qin 

机构地区：[1]Key Laboratory of Groundwater Resources and Environment(Ministry of Education),Jilin University,Changchun,130021,China [2]Jilin Provincial Key Laboratory of Water Resources and Environment,Jilin University,Changchun,130021,China [3]National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology,Jilin University,Changchun,130021,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第5期123-132,共10页环境科学与工程前沿（英文）

基　　金：the National Key R&D Program of China(No.2018YFC1802500).

摘　　要：This study evaluates the applicability of nano-sized calcium peroxide(CaO_(2))as a source of H_(2)O_(2)to remediate 2,4-dichlorophenol(2,4-DCP)contaminated groundwater via the advanced oxidation process(AOP).First,the effect and mechanism of 2,4-DCP degradation by CaO_(2)at different Fe concentrations were studied(Fenton reaction).We found that at high Fe concentrations,2,4-DCP almost completely degrades via primarily the oxidation of·OH within 5 h.At low Fe concentrations,the degradation rate of 2,4-DCP decreased rapidly.The main mechanism was the combined action of·OH and O_(2)^(·−).Without Fe,the 2,4-DCP degradation reached 13.6%in 213 h,primarily via the heterogeneous reaction on the surface of CaO_(2).Besides,2,4-DCP degradation was significantly affected by solution pH.When the solution pH was>10,the degradation was almost completely inhibited.Thus,we adopted a two-dimensional water tank experiment to study the remediation efficiency CaO_(2)on the water sample.We noticed that the degradation took place mainly in regions of pH<10(i.e.,CaO_(2)distribution area),both upstream and downstream of the tank.After 28 days of treatment,the average 2,4-DCP degradation level was≈36.5%.Given the inadequacy of the results,we recommend that groundwater remediation using nano CaO_(2):(1)a buffer solution should be added to retard the rapid increase in pH,and(2)the nano CaO_(2)should be injected copiously in batches to reduce CaO_(2)deposition.

关 键 词：Calcium peroxide 2 4-DCP Reaction zone Fenton reaction 

分 类 号：X523[环境科学与工程—环境工程]