某铬污染场地地下水可渗透反应墙技术(PRB)修复中试应用

Pilot Application of PRB Remediation of Groundwater in a Chromium Contaminated Site

铬渣污染不仅会直接污染场地和危害附近居民的人体健康,而且还会影响周围区域土壤和地下水质量的生态安全。某污染场地历史遗留大量铬渣,造成厂区及周边土壤和地下水严重污染,为了修复地下水,比较了不同的地下水修复技术,采用了可渗透反应墙技术(PRB)进行了中试,中试经济技术指标达到《地下水质量标准》(GB/T 14848-2017)中Ⅳ类水标准,即六价铬浓度﹤0.1 mg/L,锌浓度﹤5 mg/L,砷浓度﹤0.05 mg/L,锰浓度﹤1.5 mg/L。

Chromium residue pollution will not only directly pollute the site and endanger the human health of the nearby residents,but also affect the ecological safety of the soil and groundwater quality in the surrounding area.A large amount of chromium residue left over from a contaminated site caused serious pollution of soil and groundwater in the factory and surrounding areas.In order to restore groundwater,different groundwater remediation technologies were compared and a pilot test was carried out using Permeable Reactive Barrier(PRB).The economic and technical indexes of the pilot scale reached theⅳwater standard in《Groundwater Quality Standard》(GB/T 14848-2017),namely,hexavalent chromium concentration<0.1 mg/L,zinc concentration<5 mg/L,Arsenic concentration<0.05 mg/L,manganese concentration<1.5 mg/L.