改性芬顿试剂修复农药污染土壤的工艺条件优化

颜湘华; 刘星海; 王兴润; 赵彩云; 佟雪娇

doi:10.12153/j.issn.1674-991X.20190094

改性芬顿试剂修复农药污染土壤的工艺条件优化

doi: 10.12153/j.issn.1674-991X.20190094

^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

详细信息

作者简介:
颜湘华(1982—),男,工程师,硕士,主要从事固体废物和土壤污染防治技术研究,yanxh@craes.org.cn

通讯作者:
王兴润 E-mail: wangxr@craes.org.cn

中图分类号: X53
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出版历程
- 收稿日期: 2019-05-31
- 刊出日期: 2020-03-20

Condition optimization of pesticide contaminated soils remediation by modified Fenton reagent

^1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences
^2. Yuhuan Environmental Technology Co., Ltd.

More Information

Corresponding author: Xingrun WANG E-mail: wangxr@craes.org.cn

摘要

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%。
- 改性芬顿试剂 /
- 氯代有机物 /
- 苯系物 /
- 化学氧化 /
- 土壤修复
Abstract: 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 Fe ²⁺. 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%.
- modified Fenton reagent /
- chlorinated organics /
- BTEX /
- chemical oxidation /
- soil remediation

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参考文献(19)

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