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This article in JEQ

  1. Vol. 26 No. 4, p. 1182-1190
     
    Received: Aug 9, 1996


    * Corresponding author(s): Gunnar.Borjesson@mikrob.slu.se
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doi:10.2134/jeq1997.00472425002600040034x

Effects of a Gas Extraction Interruption on Emissions of Methane and Carbon Dioxide from a Landfill, and on Methane Oxidation in the Cover Soil

  1. Gunnar Börjesson * and
  2. Bo H. Svensson
  1. D epartment of Microbiology, Swedish University of Agricultural Sciences, Box 7025, S-750 07 Uppsala, Sweden.
    D epartment of Water and Environmental Studies, Linköping University, S-583 81 Linköping, Sweden.

Abstract

Abstract

Landfills are regarded as important sources of atmospheric methane (CH4), one of the major greenhouse gases. In this study, we investigated the effects of a gas extraction system on emissions of CH4 and carbon dioxide (CO2) to the atmosphere, from a small (0.37-ha) Swedish landfill site. The experiment was conducted using a static chamber technique and 11 permanent frames installed in a transect. Measurements were made for 7 d with a gas extraction system in operation, followed by 7 d without gas extraction, and a third week when the system was operating again. Methane emissions ranged between −0.056 and 182 mmol CH4 m−2 h−1 when the extraction system was in operation, and between −0.060 and 872 mmol CH4 m−2 h−1 during the interruption period. The interruption resulted in enhanced CH4 concentrations in the cover-soil profile, especially in the surface soil (0–0.25 m depth), and CH4 oxidation activity was significantly increased in most parts of the soil cover during the interruption, thus indicating that the growth of CH4-oxidizing bacteria increased in response to enhanced CH4 concentrations.

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