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Landfill methane oxidation in engineered soil columns at low temperature

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Details

Original languageEnglish
Pages (from-to)313-334
Number of pages22
JournalWater Air and Soil Pollution
Volume177
Issue number1-4
DOIs
Publication statusPublished - Nov 2006
Externally publishedYes
Publication typeA1 Journal article-refereed

Abstract

Though engineered covers have been suggested for reducing landfill methane emissions via microbial methane oxidation, little is known about the covers' function at low temperature. This study aimed to determine the methane consumption rates of engineered soil columns at low temperature (4-12°C) and to identify soil characteristics that may enhance methane oxidation in the field. Engineered soils (30 cm thick) were mixtures of sewage sludge compost and de-inking waste, amended with sand (SDS soil) or bark chips (SDB soil). At 4-6°C, we achieved rates of 0.09 gCH4 kgTS-1d -1 (0.02 m3 m-2d-1) and 0.06 gCH4 kgTS-1d-1 (0.009 m3 m -2d-1) with SDS and SDB soils, respectively. With SDS, good movement and exchange of oxygen in porous soil moderated the slowdown of microbial activity so that the rate dropped only by half as temperature declined from 21-23°C to 4-6°C. In SDB, wet bark chips reduced the soil's air-filled porosity and intensified non-methanotrophic microbial activity, thus reducing the methane consumption rate at 4-6°C to one fourth of that at 21-23°C. In conclusion, soil characteristics such as air-filled porosity, water holding capacity, quantity and stabilization of organic amendments that affect the movement and exchange of oxygen are important variables in designing engineered covers for high methane oxidation at low temperature.

Keywords

  • Landfill cover, Low temperature, Methane oxidation, Organic amendments, Soil