Insoluble substrates for reductive dehalogenation in permeable reactive barriers

摘要

Laboratory screening studies were conducted to evaluate the suitability of several different edible oils for enhancing reductive dehalogenation in a permeable reactive barrier (PRB). Corn oil degraded most raidly follwed by liquid soybean oil, solid soybean oil and semi-solid soybean oil in buffered liquid media with an anaerobic digester sludge inoculum. In microcosm studies using sediment frm a chlorinated solvent contaminated aquifer, semi-solid soybean oil supported rapid conversion of trichlorethene (TCE) and cis-1, 2-dichloroethene (cis-DCE) to vinyl chloride (VC) and then to ethene. Molasses and liquid soybean oil also stimulated reductive dehalogenation; however, ethene production was slower than for the semi-solid soybean oil. Extensive field pilot tests are being conducted in a chlorinated solvent contaminated aquifer to evaluate two different approaches for enhancing reductive dehalogenation in permeable reactive barriers.