改性Fenton氧化法修复石油污染土壤影响因素分析

Study on Influence Factors of Petroleum Contaminated Soil Remediated by Modified Fenton Technology

利用柠檬酸改性Fenton氧化技术修复陕北石油污染土壤,通过单因素试验分析H2O2、Fe SO4·7H2O、柠檬酸浓度对反应过程中H2O2的稳定性、有效利用情况及处理效果的影响。得出以下结论:H2O2的投加浓度与TPH、SOM氧化率正相关,与H2O2的稳定性、有效利用率反相关,H2O2浓度超过600 mmol/L时其无效分解比例大幅增加;Fe SO4·7H2O浓度过高不利于H2O2的稳定,过低会限制反应的进行,适宜浓度为6 mmol/L;柠檬酸的投加可延长H2O2寿命,降低SOM氧化率,其浓度超过20 mmol/L时H2O2稳定性、TPH降解率呈下降趋势。在各适宜浓度条件下其H2O2有效利用率为80.17%,TPH降解率为33.68%,SOM氧化率为4.22%。

This study attempts to restore the petroleum contaminated soil in northern Shaanxi by using citric acid modified Fenton reagent,with the influence of H2 O2,Fe SO4·7 H2 O,citric acid concentration on stability and effective utilization of H2 O2 in the reaction process and the relationship between them and treatment efficiency being investigated. The results show that the H2 O2 concentration is positively correlated with TPH degradation rate and SOM oxidation rate,and that it was inversely correlated with the stability and effective utilization of H2 O2.When the concentration of H2 O2 is over 600 mmol/L,the ratio of its decomposition will increase significantly; the stability of H2 O2 was not conducive or the reaction will be limited when the concentration of Fe SO4·7 H2 O is higher or lower than 6 mmol/L; the addition of citric acid can prolong the life time of H2 O2 and can reduce the oxidation rate of SOM simultaneously,When the concentration is over 20 mmol/L,the stability of H2 O2 and the TPH degradation rate decrease.Under the suitable concentration conditions,the effective utilization rate of H2 O2 being 80. 17 %,TPH degradation rate reaching 33. 68 %,and the SOM oxidation rate 4. 22 %.