摘要
氯代烃污染地下水修复技术开发与应用一直是学术界研究的热点。通过小试实验获取了Fe^(2+)和NaOH活化Na_(2)S_(2)O_(8)修复氯代烃的最优参数,利用高压旋喷技术进行工程实例应用,修复完成后,对地下水修复效果及潜在腐蚀风险进行评价。结果表明:NaOH活化Na_(2)S_(2)O_(8)对氯乙烯的去除率较Fe^(2+)活化更高,当过硫酸盐投加比为2%时,可满足修复要求。工程修复后,地下水中氯乙烯、1,1,2-三氯乙烷和1,2-二氯乙烷浓度均低于修复目标值,且随时间延长均呈逐渐降低趋势,满足修复要求。从地下水pH值、ORP、残留的硫酸盐和氯化物浓度等角度对修复后地下水腐蚀风险进行分析表明腐蚀风险较低。
The development and application of chlorinated hydrocarbon contaminated groundwater remediation technology has been a hot topic in the academic field.The optimum parameters for repairing chlorinated hydrocarbons by activating Na_(2)S_(2)O_(8)with Fe^(2+)and NaOH were obtained through a pilot experiment.The high pressure rotary jet technology was applied to an engineering example.After the restoration,the groundwater restoration effect and potential corrosion risk were evaluated.The results showed that the removal rate of vinyl chloride by NaOH activation of Na_(2)S_(2)O_(8)was higher than that by Fe^(2+)activation,when the persulfate dosage was_(2)%,therepair requirement could be met.After the restoration,the concentrations of vinyl chloride,1,1,2-trichloroethane and 1,2-dichloroethanein groundwater were all lower than the restoration target values,and showed a gradually decreasing trend with the extension of time,which met the restoration requirements.The analysis of groundwater corrosion risk from p H,ORP,residual sulfate and chloride concentration showed that the corrosion risk is low.
作者
梁增强
宋文筠
Liang Zengqiang;Song Wenjun(Tianjin Huanjian Environmental Detecting Co.,Tianjin 300191,China;Tianjin Environmental Pollution Damage Appraisal and Assessment Center,Tianjin 300191,China)
出处
《河北环境工程学院学报》
CAS
2024年第4期82-89,共8页
Journal of Hebei University of Environmental Engineering
关键词
原位化学氧化
氯代烃
地下水修复
效果评估
腐蚀风险
in-situ chemical oxidation
chlorinated hydrocarbons
groundwater remediation
effect evaluation
corrosion risk
