ERT法监测高压旋喷修复PAHs污染现场试验研究  

Field study on ERT monitoring high-pressure rotary jet repairing PAHs pollution

作　　者：柳迪[1] 宋权威 李玲 胡杰[1] 王颋军 杜显元 邓永锋[5] 柯瀚[1] LIU Di;SONG Quan-wei;LI Ling;HU Jie;WANG Ting-jun;DU Xian-yuan;DENG Yong-feng;KE Han(Key Laboratory of Soft Soils and Geoenvironmental Engineering,Ministry of Education,Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;State Key Laboratory of Petroleum Pollution Control,Beijing 102206,China;CNPC Research Institute of Safety and Environment Technology,Beijing102206,China;CECEP DADI Environmental Remediation Co.,Ltd.,Beijing 100085,China;Institute of Geotechnical Engineering,Transportation College,Southeast University,Nanjing 210096,China)

机构地区：[1]浙江大学岩土工程研究所,软弱土与环境土工教育部重点试验室,浙江杭州310058 [2]石油石化污染物控制与处理国家重点试验室,北京102206 [3]中国石油集团安全环保技术研究院有限公司,北京102206 [4]中节能大地环境修复有限公司,北京100085 [5]东南大学交通学院,岩土工程研究所,江苏南京210096

出　　处：《中国环境科学》2023年第11期5933-5943,共11页China Environmental Science

基　　金：国家重点研发计划(2019YFC1806000,2019YFC1806004);中国石油集团科技创新基金资助项目(2022DJ6906);浙江省领雁研发攻关计划(2022C03095)。

摘　　要：选用过硫酸钠(PS)作为氧化剂,微米铁/纳米铁/碳载铁/NaOH作为激活剂,通过高压旋喷工艺氧化修复多环芳烃(PAHs)污染土,利用高密度电阻率法(ERT)监测旋喷过程中土壤的电阻值分布,分析了氧化药剂在修复过程中的迁移转化规律,比较了4组药剂旋喷后48h的修复效果.结果表明:ERT准确地反映了污染修复发生的位置,最大偏差小于0.5m;电阻变化值与萘修复值呈现正相关关系,通过拟合曲线估计的污染修复值与实际修复值之间存在误差,误差为10.3%~22.6%;碳载铁粉显示出良好的稳定与缓释性能,旋喷后稳定氧化阶段延长约8h;最终预设修复区域内污染去除量:碳载铁粉组>纳米铁粉组>微米铁粉组≈NaOH组.In this study,sodium persulfate(PS)was selected as the oxidant,Fe0[μm],Fe0 nm,BC-nZVI and NaOH were chosen as activators,and repair PAHs-contaminated soil through high-pressure rotary spraying process by mixture of PS and activators.The high-density electrical resistivity tomography(ERT)technique was employed to monitor the distribution of soil resistivity during the rotary jet process,enabling an analysis of the migration and transformation patterns of the oxidation agents during the remediation process.Additionally,the remediation effects of the 4 agent groups were compared after a 48-hour jet period.The experimental results demonstrated that ERT accurately reflected the locations of pollution remediation,with a maximum deviation of less than 0.5m.The changes in resistivity showed a positive correlation with naphthalene remediation.However,discrepancies existed between the estimated remediation values obtained from fitting curves and the actual remediation values,with errors ranging from 10.3%to 22.6%.Among the tested reagents,carbon-supported iron powder exhibited excellent stability and sustained release performance,leading to an extension of the stable oxidation stage by approximately 8hours after jet.Ultimately,the predetermined remediation area achieved the highest level of pollutant removal in the following order:BC-nZVI>Fe0[nm]>Fe0[μm]≈NaOH.

关 键 词：高密度电阻率法 高压旋喷 原位氧化 多环芳烃 现场试验 

分 类 号：X53[环境科学与工程—环境工程]