Remediation of BTEX in groundwater with LNAPL using oxygen-releasing materials (ORM)

摘要

A field scale study was conducted at a former gasoline service station to evaluate the remediation of groundwater contaminated with dissolved benzene, toluene, ethylbenzene, and xylenes (BTEX) using oxygen-releasing materials (ORM). The injectionof oxygen through ORM slurry was the remedial alternative chosen to enhance the in-situ microbial degradation of the BTEX in groundwater. Direct-push drilling methods were used to inject the ORM into the source area of impacted groundwater in a grid pattern with five-foot (1.5 m) centers. The remediation of residual pockets of light, non-aqueous phase liquids (LNAPL) was enhanced by the injection of the ORM slurry, which forced the LNAPL to flow into existing monitoring wells where it could be collected with a bailer. The results of groundwater sampling show increased post-injection dissolved oxygen (DO) concentrations and a 16