低浓度双氧水提高原油污染土壤氧化效果的实验研究  

Study on improving the oxidation effect of crude oil contaminated soil by low concentration hydrogen peroxide

作　　者：徐金兰[1] 郭玉琴 郭阳 XU Jinlan;GUO Yuqin;GUO Yang(School of Environmental and Municipal Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院

出　　处：《西安建筑科技大学学报（自然科学版）》2019年第5期743-750,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51778524)

摘　　要：在两种不同Fe^2+浓度和6种双氧水投加浓度的Fenton条件下,对5种原油污染土壤进行了氧化实验.结果表明,投加225 mmol/L低浓度双氧水可促进土壤中短链烃C11-C20的氧化去除,Total Petroleum Hydrocarbon(TPH)的氧化率高达38%.这是由于在低浓度双氧水(150~225 mmol/L)条件下H2O2分解时间长且产氧率低,从而能产生高强度的 OH,此时,短链烃C11-C20的解析与氧化达到平衡,因而能被大量氧化去除.而高双氧水投加浓度(300~900 mmol/L)条件下,H2O2分解时间短且产氧率高,仅能产生低强度 OH.这使得长链烃来不及氧化,水相残余的浓度较高.The oxidation experiments of five crude oil contaminated soils were carried out under two different Fe 2+concentrations and six hydrogen peroxide concentrations.The results showed that the removal of short-chain hydrocarbons C11-C20 in soil could be improved by the addition of low concentration hydrogen peroxide(225 mmol/L),and the removal of total petroleum hydrocarbons(TPH)came up to 38%.This was due to H2O2 which has a long decomposition time and a low oxygen production rate under low-concentration of hydrogen peroxide conditions(150~225 mmol/L),so that high-intensity OH can be produced.At this time,the desorption and oxidation of the short-chain hydrocarbon C11-C20 were balanced,and funther removed by a large amount of oxidation.Under the condition of high hydrogen peroxide concentration(300~900 mmol/L),H2O2 has a short decomposition time and a high oxygen production rate,and only produces low strength OH.This makes long-chain hydrocarbons less oxidized and the residual concentration of the aqueous phase is higher.

关 键 词：低浓度H2O2 羟基自由基 产氧 FENTON氧化 原油污染土壤 

分 类 号：X53[环境科学与工程—环境工程]