改性芬顿试剂修复农药污染土壤的工艺条件优化  

Condition optimization of pesticide contaminated soils remediation by modified Fenton reagent

作　　者：颜湘华[1] 刘星海 王兴润[1] 赵彩云 佟雪娇 YAN Xianghua;LIU Xinghai;WANG Xingrun;ZHAO Caiyun;TONG Xuejiao(State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences;Yuhuan Environmental Technology Co., Ltd.)

机构地区：[1]环境基准与风险评估国家重点实验室,中国环境科学研究院 [2]煜环环境科技有限公司

出　　处：《环境工程技术学报》2020年第2期288-292,共5页Journal of Environmental Engineering Technology

基　　金：石家庄高新区区级科技计划项目(17131002A)

摘　　要：在农药污染土壤中加入乙二胺四乙酸二钠(EDTA-2Na)改性传统芬顿试剂,研究化学氧化修复处理土壤中氯代有机物和苯系物的效果,探究EDTA-2Na、H2O2、FeSO4浓度和H2O2投加次数对土壤中苯、1,2-二氯苯降解率的影响。结果表明:加入与Fe^2+物质的量比为1∶1的EDTA-2Na,苯的降解率提高了29.6个百分点,1,2-二氯苯的降解率提高了26.4个百分点;相同试验条件下,苯、1,2-二氯苯的降解率随着EDTA-2Na、H2O2、FeSO4浓度和H2O2投加次数的增加而上升,然后逐步趋于稳定;适宜工艺参数是H2O2浓度为3.0 mmol/g,n(H2O2)∶n(FeSO4)∶n(EDTA-2Na)为10∶1∶1(n为物质的量),反应时间为2 h,H2O2分4次投加,此时苯的降解率最高达86.0%,1,2-二氯苯的降解率最高达83.6%。Fenton reagent modified by EDTA-2Na was applied to study the chemical oxidation remediation of chlorinated organics and BTEX in pesticide contaminated soils.The effects of EDTA-2Na,H2O2,FeSO4 dosage and H2O2 dosing times on pollutants degradation rate were studied.The results showed that the degradation rate of benzene was increased by 29.6 percentage points and that of 1,2-dichlorobenzene by 26.4 percentage points when EDTA-2Na was added in the ratio of 1∶1 to Fe2+.Under the same experimental conditions,the degradation rates of benzene,1,2-dichlorobenzene increased with the addition of EDTA-2Na,H2O2,FeSO4,H2O2 concentrations,as well as with H2O2 dosing times,and then gradually stabilized.The suitable process parameters were identified as follows:H2O2 dosage 3.0 mmol/g,n(H2O2)∶n(FeSO4)∶n(EDTA-2Na)=10∶1∶1,and reaction time 2 hours,and H2O2 added within 4 times.Under these conditions,the degradation rate of benzene was high up to 86.0%,and that of 1,2-dichlorobenzene was up to 83.6%.

关 键 词：改性芬顿试剂 氯代有机物 苯系物 化学氧化 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]