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Attenuation of Methane and Volatile Organic Compounds in Landfill Soil Covers

Environment & Resources, Bygningstorvet-Building 115, Technical University of Denmark, DK-2800 Lyngby, Denmark

View larger version (35K): [in a new window]   Fig. 1. The degradation of hydrochlorofluorocarbons HCFC-21 and HCFC-22 in 5 incubation bottles randomly chosen out of 10. Open symbols represent HCFC-21 and filled symbols represent HCFC-22.

View larger version (16K): [in a new window]   Fig. 2. Headspace concentration of methane, oxygen, and carbon dioxide as function of time, showing methane oxidation in a batch experiment containing 20 g soil sampled at 15 to 20 cm below the soil surface. (A) Active batch experiment. (B) Control experiment.

View larger version (49K): [in a new window]   Fig. 3. Relative headspace concentration of chlorinated hydrocarbons as a function of time in a batch experiment containing 20 g soil pre-exposed to landfill gas. (A) Chlorinated methanes. (B) Chlorinated ethylenes. (C) Chlorinated ethanes. (D) Chlorofluorocarbons. (E) Hydrochlorofluorocarbons. (F) Hydrofluorocarbons. (G) Aromatic hydrocarbons.

View larger version (34K): [in a new window]   Fig. 4. (A, B) Maximal methane oxidation and degradation rates of trace components in batch experiments as a function of soil sampling depth. (C) A representative soil gas depth profile measured at the soil sampling location during a one-year field campaign (Christophersen et al., 2001).