过硫酸钠对芳香烃污染地下水原位化学氧化工程中试研究

In Situ Chemical Oxidation of Groundwater Contaminated with Aromatic Hydrocarbons by Sodium Persulfate and the Statistical Analysis of Remediation

过硫酸钠作为氧化剂在国内外已经被广泛用于石油烃和芳香烃污染土壤和地下水的修复。过硫酸钠在活化后可以产生SO^(-)·和·OH^(-)等具有强氧化性的基团,可以降解石油类污染物中的烷烃、芳香烃等多种石油烃组分。本文在过硫酸钠与芳香烃反应机理的基础上,选择广州某厂含芳香烃污染的地下水为对象,开展过硫酸钠原位修复工程中试研究。结果显示活化过硫酸钠修复船漆工序区芳香烃污染地下水取得了一定的成效,5口地下水监测井的浅层和深层样品的污染物去除效率分别达到了44.44%~90.44%和35.14%~96.11%。非线性逻辑回归模型对监测井氧化还原电位的建模分析显示4个监测井的氧化还原电位都受时间的显著影响,而不是深度。根据皮尔森相关系数结果,降解后乙苯和间、对-二甲苯浓度与各监测井氧化还原电位有显著的相关关系。

Sodium persulfate as an oxidant solution has been widely applied in the remediation of petroleum and aromatic hydrocarbons contaminated soil and groundwater.The activated sodium persulfate could produce strong oxidizing groups such as SO^(-)·and·OH^(-),to degrade various petroleum hydrocarbon components such as alkanes and aromatic hydrocarbons.This paper discusses a pilot test study of in-situ remediation with sodium persulfate application dealing with a groundwater contamination case in a site in Guangzhou,based on the reaction mechanism of sodium persulfate and the aromatic hydrocarbons.The study result demonstrates a sufficient effectiveness in groundwater remediation of aromatic hydrocarbons.The removal rate of the shallow-layer samples and the deep-layer samples of five groundwater monitoring wells could reach a range of 44.44%~90.44%and 35.14%~96.11%,respectively.In addition,applying the non-linear logistic regression model reveals that the key factor influencing the oxidation-reduction potential of the monitoring wells involved is the time,but not the depth.Pearson product-moment correlation coefficient study identifies the concentration of ethylbenzene and m-&p-xylene after degradation has significant correlation with the reduction potential of each monitoring well.