Comparison of Aerobic and Anaerobic Biotreatments of Low-Level Vinyl Chloride (Abstract)

摘要

A field comparison study of aerobic and anaerobic enhanced bioremediation was conducted on two low-level vinyl chloride (VC) plumes in groundwater in the surficial (Columbia) aquifer of Solid Waste Management Unit (SWMU) 2C at NAS Oceana in Virginia Beach, VA. ORC~R (Regenesis, San Clemente, CA) was used in the approxi- mately 80,000 square foot north groundwater plume area as a time-release oxygen source to facilitate aerobic biodegradation of vinyl chloride (VC) in groundwater. NewmanZone emulsified vegetable oil (RNAS, Inc., Brooklyn Center, MN) was used in the approxi- mately 84,000 square foot south groundwater plume area as an electron donor to promote reductive dechlorination (RD) of VC. At SWMU 2C, the surficial aquifer consists mostly of fine to medium grained sands with occasional thin, discontinuous layers of silt. Groundwater velocity is estimated at 10 ft/year. Depth to groundwater is usually between four and nine feet. The Yorktown Confining Unit is generally encountered between 16' and 20' bgs. The estimated average hydraulic gradient across SWMU 2C is 0.036 ft/ft.