CaO2/Fe^2＋活化过硫酸钠对石油类污染土壤的修复效果  

Remediation of petroleum hydrocarbon-contaminated soils by CaO_2/Fe^(2+) activatal persulfate

作　　者：吴昊[1] 孙丽娜[1] 王辉[1] 王晓旭[1] 

机构地区：[1]沈阳大学环境学院,区域污染环境生态修复教育部重点实验室,沈阳110044

出　　处：《环境化学》2016年第4期623-628,共6页Environmental Chemistry

基　　金：国家重点基础研究发展计划项目(973计划)(2014CB441106);沈阳市科技计划项目(F14-133-9-00);沈阳市科学事业费竞争性选择项目(城市生态风险管理及其修复技术研究);科技部中德科技合作项目(S2012ZR01912)资助~~

摘　　要：本文探讨了利用过氧化钙活化过硫酸钠氧化修复实际污染场地长期高浓度石油类(TPH)污染土壤的可行性.研究了过氧化氢、过氧化钙、过氧化钙/Fe^(2+)等活化方法对TPH降解效率的影响.结果表明,对于TPH污染较重的土壤(浓度15000 mg·kg-1),过氧化钙较过氧化氢活化过硫酸钠降解的效果更好,使用过氧化氢活化方法,TPH最高降解率仅为25.6%,而当过氧化钙/过硫酸钠的用量(物质的量之比)为1/5时,反应7 d,TPH去除率达到67.4%,反应不需要添加额外的活化剂.当Fe^(2+)/过氧化钙/过硫酸钠的用量为1/2/5时,反应7 d,TPH降解率为82.1%,较不添加Fe^(2+)高14.6%,反应后体系呈中性.进一步增加过氧化钙的用量,TPH去除率和体系p H均增加.研究表明,Ca O_2/Fe^(2+)活化过硫酸钠氧化修复石油类污染土壤效果较好,考虑到实际场地后续利用的可行性,Fe^(2+)/过氧化钙/过硫酸钠的用量为1/2/5较为合适.Laboratory batch-scale experiments were conducted to evaluate the feasibility of long-term petroleum hydrocarbon-contaminated soil remediation using persulfate and calcium peroxide. Factors tested included type of activators. The best activation method used calcium peroxide / ferrous sulfate which achieved 82. 1% TPH degradation at 7 d with an initial TPH concentration of15000 mg·kg- 1. For hydrogen peroxide and calcium peroxide activation treatments, TPH degradation efficiencies were 25. 6% and 67. 4%,respectively. The slurry pH was 7. 1 after oxidation used calcium peroxide / ferrous sulfate activation method. Results also revealed that the TPH degradation and pH both increased with the extra addition of calcium peroxide. The results suggested that the activation method of ferrous sulfate / calcium peroxide / sodium persulfate was suitable for soil remediation and the suitable dosage ratio was 1 /2 /5.

关 键 词：活化过硫酸钠 过氧化钙 石油类 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]