Dillon Consulting Ltd. (formerly with Univ. of Guelph), Canada.
School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada.
Sci Total Environ. 2022 Dec 10;851(Pt 2):158351. doi: 10.1016/j.scitotenv.2022.158351. Epub 2022 Aug 29.
Emissions from Canadian landfills account for 20 % of national greenhouse gas emissions, a portion of which occur as fugitive emissions. Depending on management factors, significant quantities of landfill gas are emitted during the operational phase and over several decades following landfill closure. Successful landfill reclamation developments depend on low-maintenance solutions to manage fugitive emissions. Designing passive methane oxidation biosystems (PMOBs) to complement landfill covers has become a promising complementary strategy. Achieving year-round methane oxidation in cold climates, requires specific conditions for survival of methanotrophic bacteria (responsible for methane oxidation), including optimal temperature, moisture and sufficient supply of O and CH. The objective of this study was to design, construct and monitor a fully instrumented pilot-scale PMOB capable of abating fugitive methane emissions from a closed landfill in the city of Kitchener, Ontario, now a public park. Factors considered in the design include type of PMOB media, methane loading rates, hydraulic behaviour and ambient temperature. Methane oxidation efficiencies between 73 and 100 % were achieved during the monitoring period. The goal was to develop a long-term solution to mitigate fugitive methane emissions at this closed landfill. Successful mitigation will provide a low-maintenance, high impact technology that could be adopted by the municipality for abatement of CH emissions at other landfills under its management. The results will also be useful to landfill designers, operators, and regulatory bodies. Overall, the PMOB construction and monitoring results supported evidence that the designed PMOB was capable of abating most of the CH loading. The paper describes several steps taken to design, install and operate the PMOB.
加拿大垃圾填埋场的排放占全国温室气体排放量的 20%，其中一部分是逸散排放。根据管理因素的不同，在运营阶段和填埋场关闭后的几十年内，会有大量的垃圾填埋气排放。成功的垃圾填埋场再开发取决于对逸散排放进行低维护管理的解决方案。设计被动甲烷氧化生物系统（PMOB）来补充覆盖层已成为一种很有前途的补充策略。在寒冷气候下实现全年甲烷氧化，需要为负责甲烷氧化的甲烷营养菌提供生存的特定条件，包括最佳温度、湿度和充足的 O 和 CH 供应。本研究的目的是设计、构建和监测一个全尺寸的、具有仪器仪表的 PMOB 原型，以减轻安大略省滑铁卢市一个已关闭的垃圾填埋场的逸散甲烷排放，该垃圾填埋场现在是一个公共公园。设计中考虑的因素包括 PMOB 介质类型、甲烷负荷率、水力行为和环境温度。在监测期间，甲烷氧化效率在 73%至 100%之间。目标是为这个已关闭的垃圾填埋场开发一种长期的解决方案来减少逸散甲烷排放。成功的缓解将提供一种低维护、高影响的技术，该技术可以被市政府采用，以减少其管理下其他垃圾填埋场的 CH 排放。该结果也将对垃圾填埋场的设计者、运营者和监管机构有用。总的来说，PMOB 的构建和监测结果证明了所设计的 PMOB 能够减少大部分的 CH 负荷。本文介绍了设计、安装和运行 PMOB 所采取的几个步骤。
