某石油烃污染场地地下水修复技术研究

Study on Groundwater Remediation Technology of a Petroleum Hydrocarbon Contaminated Site

抽出处理和原位化学氧化是常用的两种地下水修复技术。本文以江苏某石油烃污染场地为研究对象,开展两种技术修复石油烃污染地下水的中试规模工程应用研究。结果表明,两种技术均能够有效去除地下水中的石油烃,去除率均在80%以上。抽出处理技术持续实施60天后,达到修复要求,停止抽水后,污染物浓度略有反弹,上升约10%。原位化学氧化技术中试实验中,石油烃浓度在药剂注射完成后的第15天即达到修复目标要求,30天后去除率达到最高,随后污染物浓度有一定反弹,上升浓度在10%~20%之间。本研究所用氧化药剂,会对地下水造成硫酸盐污染,跟踪监测显示,原位化学氧化实验结束后,硫酸盐浓度会随着时间延长而逐渐降低,并于药剂注射结束后的第330天满足相关限值要求。

Pump and treat technique and in situ chemical oxidation are two commonly used groundwater remediation techniques.In this paper,a petroleum hydrocarbon contaminated site in Jiangsu Province was selected as the research object to carry out pilot-scale engineering application research of these two technologies for remediation of petroleum hydrocarbon contaminated groundwater.The results show that both technologies can effectively remove petroleum hydrocarbons from groundwater,and the removal rate is above 80%.The pump and treat technology was continuously implemented for 60 days to meet the remediation requirements,and the pollutant concentration slightly rebounded and increased by about 10%after the pumping was stopped.In the pilot experiment of in situ chemical oxidation technology,the petroleum hydrocarbon concentration reached the remediation target requirement on the 15th day after the completion of chemical agent injection.The removal rate reached the highest after 30 days,followed by a certain rebound of the pollutant concentration,with the rising concentration ranging from 10%~20%.The oxidizing agent utilized in this study could cause the sulfate pollution to groundwater.Follow-up monitoring showed that the sulfate concentration would gradually decrease with time after the in-situ chemical oxidation experiment and met the relevant limit value on the 330th day after the end of agent injection.