络合剂改进Fenton反应去除土壤中石油污染物的效果  

Enhanced Removal of Soil Petroleum Pollutants by Modified Fenton Reaction with Chelating Agents

作　　者：李方敏[1] 柳红霞[1] 梅平[1,2] 李凡修 刘迪佩[1] 

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]中国石油HSE重点实验室长江大学研究室,湖北荆州434023

出　　处：《农业环境科学学报》2014年第1期88-94,共7页Journal of Agro-Environment Science

基　　金：中国科学院生态环境研究中心城市与区域生态国家重点实验室开放基金(SKLURE2012-2-2);国家自然科学基金(41271482)

摘　　要：为构建用于石油污染土壤修复的自然土壤pH条件下具有较强氧化能力和温和的Fenton反应,以室内模拟石油污染土壤为对象,采用L8(4×24)正交试验设计,研究了4种络合剂类型、用量和[H2O2]/[Fe3+]等因素对改进型Fenton反应去除石油污染物效果的影响,并对各处理土壤中残油进行了气相色谱分析。结果表明:经48 h反应后,络合剂β-环糊精、草酸钠、EDTA二钠和柠檬酸三钠改进Fenton处理对土壤中石油烃类清除率分别为41.5%、30.6%、27.6%和25.3%,而无络合剂的对照处理为13.6%;较高络合剂用量和氧化剂用量的Fenton处理,更有利于nC21以下中、短链正烷烃的氧化分解,对姥鲛烷、植烷及iC17~iC18的异构烷烃也有较好的降解效果;其中以β-环糊精去除土壤中石油烃类效果最好,络合剂改进的Fenton反应能够无选择性地去除石油烃类诸组分。In order to better use the traditional Fenton reaction to remediate petroleum contaminated soils, a simulated petroleum-contami-nated soil(light silty loam soil)was used to examine removal efficiency of the petroleum by Fenton reaction modified with chelating agents in a laboratory. Four chelating agents and their rates and [H2 O2 ]/[Fe3+] ratios were assessed using a orthogonal L8(4×24)design. After a 48 h′s Fenton reaction, removal percentages of petroleum hydrocarbon were 41.5%, 30.6%, 27.6% and 25.3% for chelating agents β-cyclodextrin, sodium oxalate, disodium EDTA and sodium citrate, respectively, compared to a 13.6% removal efficiency in the control without chelating agents. Higher rates of chelating agents or oxidants yielded greater removal of normal-alkanes with carbon atomic number less than 21. Removal of pristane, phytane and iso-alkanes with iC17 to iC18 was also enhanced by chelating agents-modified Fenton reaction. The findings indicate that the modified Fenton oxidation with β-cyclodextrin could be used to effectively remove petroleum from soils.

关 键 词：络合剂 FENTON氧化 石油污染 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]