CaO2及H2O2类Fenton降解土壤石油烃污染  

Degradation of total petroleum hydrocarbons pollution in soil by CaO2/H2O2-Fenton-like system

作　　者：李振宇 刘亚男[1] 王铮 战佳勋 沈玉叶 赵婧怡 张艾 LI Zhenyu;LIU Yanan;WANG Zheng;ZHAN Jiaxun;SHEN Yuye;ZHAO Jingyi;ZHANG Ai(School of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Shanghai National Engineering Research Center of Urban Water Resources Co.Ltd.,Shanghai 200082,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]上海城市水资源开发利用国家工程中心有限公司,上海200082

出　　处：《环境工程学报》2020年第3期780-788,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51708096);上海市大气颗粒物污染防治重点实验室开放课题(FDLAP18003)。

摘　　要：采用H2O2/Fe(Ⅲ)/柠檬酸类Fenton体系和CaO2/Fe(Ⅲ)/柠檬酸类Fenton体系修复土壤石油污染,考察了氧化剂种类、氧化剂投加量、Fe(Ⅲ)浓度和柠檬酸浓度对柴油降解效果的影响,并进一步研究比较了CaO2/Fe(Ⅲ)/柠檬酸和H2O2/Fe(Ⅲ)/柠檬酸2种修复方式对土壤原著微生物群落变化及豌豆植株生长所带来的生态毒性效应。单因素实验结果表明:在其他条件相同的情况下,CaO2类Fenton降解柴油效果优于H2O2类Fenton降解效果;柴油降解率随着氧化剂投加量、Fe(Ⅲ)和柠檬酸浓度的增大呈现先增后降的趋势。当CaO2浓度为166.67 mmol·L^-1、Fe(Ⅲ)浓度为27.78 mmol·L^-1、柠檬酸浓度为27.78 mmol·L^-1时,反应24 h后,土壤中柴油降解率达到44.14%。生态毒性实验表明:CaO2类Fenton处理后土壤微生物群落的丰富度和多样性指数均有所提高,H2O2类Fenton处理后均有所降低,2种处理方式均在不同程度上改变了土壤微生物群落的优势菌门构成;CaO2及H2O2类Fenton处理均抑制了豌豆植株的生长,发芽率、植株干重、株高、叶绿素含量等测试指标均下降,其中H2O2类Fenton处理的抑制效果更为明显。进一步分析可知,CaO2类Fenton处理技术比H2O2类Fenton处理技术更适用于石油污染土壤修复。In this study,H2O2/Fe(Ⅲ)/citric acid and CaO2/Fe(Ⅲ)/citric acid Fenton-like systems were used to degrade total petroleum hydrocarbons(TPH)in soil,and the effects of H2O2 and CaO2 dosages,Fe(Ⅲ)and citric acid concentrations on diesel oil degradation efficiency in soil were investigated.Furthermore,the ecotoxicological effects of these two remediation modes on the variation of indigenous microbial communities in soil and pea plant growth were compared.The results showed that under the situation of other conditions being equal,CaO2-Fenton-like system had a better performance on diesel oil degradation than H2O2-Fenton-like system.The diesel oil degradation efficiency increased first and then decreased with the increase of CaO2 dosage,Fe(Ⅲ)and citric acid concentration.At CaO2 dosage of 166.67 mmol·L^-1,Fe(Ⅲ)concentration of 27.78 mmol·L^-1,and citric acid concentration of 27.78 mmol·L^-1,the diesel oil degradation efficiency in soil reached 44.1% at 24 h.The ecotoxicological impacts showed that CaO2-Fenton-like treatment promoted soil microbial richness and diversity indexes,while H2O2-Fenton-like treatment reduced them.This indicated that these two treatment modes changed the compositions of soil microbes and dominant bacterial phyla in varying degrees.The CaO2 and H2O2-Fenton-like treatments inhibited the growth of pea plants,and decreased the indexes of germination rate,shoot length,plant dry weight and chlorophyll content,and H2O2-Fenton-like treatment had more serious inhibition effects.In summary,the CaO2 Fenton-like treatment is more suitable for TPHcontaminated soil remediation than H2O2 Fenton-like treatment.

关 键 词：CaO2类Fenton Fe(Ⅲ) 柠檬酸 石油烃 生态毒性效应 

分 类 号：X53[环境科学与工程—环境工程]