BIO-TARP: DEVELOPING A METHANOTROPHIC ALTERNATIVE DAILY COVER TO REDUCE LANDFILL METHANE EMISSIONS

Landfills are the largest source of anthropogenic CH4 emissions in the U.S. (U.S. Environmental Protection Agency, 2007). Field data (unpublished) have shown that substantial CH4 generation and emissions can occur before engineered gas extraction is economically feasible. Methanotrophs are indigenous aerobic microorganisms in landfill cover soils that can oxidize CH4 and thereby provide a complementary biological mechanism to reduce emissions. Even though both landfill CH4 emissions and oxidation rates can vary by more than 6 orders of magnitude (Bogner, et al., 1997), field data have confirmed that methanotrophs are capable of substantial reductions in CH4 emissions in both conventional covers and engineered "biocovers" (Huber-Humer, 2004). In addition, methanotrophs are capable of reducing emissions of nonmethane hydrocarbons (Scheutz et al., 2003).

We are developing a bioactive alternative daily cover, a "bio-tarp", to mitigate methane (CH4) emissions during the active life of a landfill cell, prior to placement of final cover. A prototype is currently under development, supported by static and dynamic laboratory testing of alternative materials with embedded methanotrophic microorganisms. Progress to date has included laboratory-scale testing of a variety of suitable immobilization techniques and development of a mixed methanotrophic culture isolated from landfill cover samples. Microarray analysis with methanotroph-specific probes confirmed the presence of a mixture of methanotrophs consisting mostly of Methylobacter and Methylocystis species. Future phases of this project will include field testing of prototype materials as well as the development of conceptual designs and proposed operational strategies.



Copyright: © IWWG International Waste Working Group
Quelle: Specialized Session F (Oktober 2007)
Seiten: 9
Preis inkl. MwSt.: € 9,00
Autor: Helene Hilger
Jean Bogner
B. Adams
Jeremy Ruffin Hamm
Levente Brodossy

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