退役炼钢厂地块多环芳烃污染土壤原位化学氧化工程实践

Engineering Practice of In-situ Chemical Oxidation of PAHs Contaminated Soil from Decommissioned Steelworks

针对某退役炼钢厂地块多环芳烃污染土壤,开展原位化学氧化中试试验。研究结果表明:原位化学氧化药剂注射次数2轮即可,氧化剂投加会造成污染物浓度的短期反弹。氧化24 d后,2轮注药区污染物去除率为87%,4轮注药区污染物去除率为63%。各土层污染物去除效果差别较大,深层土壤去除效果不稳定。原位化学氧化技术针对轻度污染土壤可修复达标,且成本和工期优于其他同类技术。

A pilot test of in-situ chemical oxidation was carried out on polycyclic aromatic hydrocarbons(PAHs)contaminated soil in a decommissioned steel plant.The results showed that the in-situ chemical oxidant could be injected twice,and the oxidant dosing would cause a short-term rebound of pollutant concentration.After 24 days of oxidation,the removal rate of pollutants in the second round of drug injection area was 87%,and the removal rate of pollutants in the fourth round of drug injection area was 63%.The removal effect of pollutants in each soil layer was quite different,and the removal effect of deep soil was unstable.In-situ chemical oxidation technology could reach the standard for the remediation of slightly polluted soil,and its cost and construction period were superior to other similar technologies.