Influence of moisture content and leachate recirculation on oxygen consumption and waste stabilization in post aeration phase of landfill operation

Ihsanullah Sohoo; Marco Ritzkowski; Kerstin Kuchta

doi:10.1016/j.scitotenv.2021.145584

Influence of moisture content and leachate recirculation on oxygen consumption and waste stabilization in post aeration phase of landfill operation

Sci Total Environ. 2021 Jun 15:773:145584. doi: 10.1016/j.scitotenv.2021.145584. Epub 2021 Feb 5.

Authors

Ihsanullah Sohoo¹, Marco Ritzkowski², Kerstin Kuchta²

Affiliations

¹ Institute of Environmental Technology and Energy Economics, Sustainable Resource and Waste Management, Hamburg University of Technology, Blohmstr. 15, 21079 Hamburg, Germany; Department of Energy and Environment Engineering, Dawood University of Technology, New M.A Jinnah Road, 74800 Karachi, Pakistan. Electronic address: sohoo.ihsanullah@tuhh.de.
² Institute of Environmental Technology and Energy Economics, Sustainable Resource and Waste Management, Hamburg University of Technology, Blohmstr. 15, 21079 Hamburg, Germany.

PMID: 33582327
DOI: 10.1016/j.scitotenv.2021.145584

Abstract

Sustainable completion of municipal solid waste landfills requires post-closure care after a time when utilization of landfill gas produced from biodecomposition of organic waste be not possible/or economically feasible. Research proved that in-situ aeration is a promising approach employed for landfill aftercare. The application of post aeration operation is targeted to achieve accelerated waste stabilization to avoid long term environmental and public health impacts from landfills. In in-situ aeration operation, consumption of supplied oxygen has significant influence on biological stabilization of solid waste placed in the landfills. The consumption of oxygen is regulated by operation parameters of landfill - one of the important is presence of moisture in landfill ecosystem. This research aims to assess the influence of moisture content and leachate recirculation on the oxygen consumption during post aeration phase of landfill operation. The effect of oxygen consumption on the extent of waste stabilization achieved after experiment was also assessed. Three lab-scale landfill simulation reactors (LSRs) were used - in two of three reactors (LSR-1 and LSR-3) operation was carried out in two phases: Anaerobic and post-aeration. One reactor (LSR-2) was operated under anaerobic condition throughout the experiment and used as control. To compare the oxygen consumption, conventional landfill (CLF) conditions without excess water addition and leachate recirculation were simulated in LSR-1 and the bioreactor landfill conditions (BRLF) with excess water injection and leachate recirculation were simulated in LSR-3. In CLF 46.4% of supplied oxygen was consumed during post aeration phase while in BRLF only 0.96% of oxygen consumption was noticed. In result of higher oxygen consumption, biostabilization rate of waste in CLF was 7% higher than BRLF at the end of experiment. This study demonstrated that, in presence of low moisture in landfill ecosystem optimal air distribution can be realized which results in enhanced waste oxidization and stabilization.

Keywords: Anaerobic landfill; Bioreactor landfill; In-situ aeration; Oxygen consumption; Post aeration; Waste stabilization.