石油烃污染地下水原位化学氧化修复研究

Research on In-situ Chemical Oxidation Remediation of Groundwater Contaminated by Petroleum Hydrocarbons

针对某地块地下水中石油烃(C6~C36)污染物,该文采用过硫酸盐作为氧化剂、氢氧化钠为活化剂开展污染地下水的原位化学氧化修复。修复技术中采用正三角形方式布设药剂投入点,单点影响半径设计为3 m,注入间距5.2 m,过硫酸盐、氢氧化钠药剂投入量为地下水质量的4%~6%、0.52%~0.78%。根据监测井水质采样分析结果,实时更新地块概念模型,结果表明原位化学氧化修复在地下水中石油烃(C6~C36)污染物降解中作用明显,均达到目标修复值。硫酸盐出现局部超标和反弹现象,但残余硫酸盐对未来受体和环境的风险仍可接受。

Aiming at the petroleum hydrocarbon(C6-C36)pollutants in groundwater of a certain land,persulfate was used as oxidant and sodium hydroxide as activator to carry out in-situ chemical oxidation remediation of polluted groundwater.In the repair technology,the drug injection point is arranged in a regular triangle way,the single point influence radius is designed to be 3 m,the injection spacing is 5.2 m,and the input amount of persulfate and sodium hydroxide is 4%~6%and0.52%~0.78%of the groundwater quality.According to the results of water quality sampling and analysis of monitoring wells,the conceptual model of the block is updated in real time.The results show that in-situ chemical oxidation remediation plays an obvious role in the degradation of petroleum hydrocarbon(C6-C36)pollutants in groundwater,and all reach the target repair value.There is a local excess and rebound of sulfate,but the risk of residual sulfate to future receptors and the environment is still acceptable.