Innovative use of compost as biocover for landfill

与垃圾填埋场相关的主要环境挑战之一是产生垃圾填埋气体（LFGs）-主要是甲烷（CH 4）和二氧化碳（CO2）。在垃圾填埋场覆盖系统中，通过称为“甲烷氧化菌”的细菌子集进行的微生物介导的甲烷氧化已被广泛接受为对抗垃圾填埋场甲烷排放的方法。 甲烷氧化菌代谢甲烷作为其唯一的碳和能量来源，并且天然存在于有足够浓度的CH 4和CO2以维持其生存的环境中，例如垃圾填埋场覆盖土壤的上层。 最近，研究的重点是增加填埋场甲烷氧化的方法，方法是选择适当的覆盖材料和改良物，如堆肥，为甲烷氧化菌的生长创造有利条件。 这种利用填埋场甲烷氧化过程的覆盖系统被称为“生物基”或“工程”覆盖系统，有可能进一步减少甲烷排放。拟议研究的总体目标是评估庭院和树叶废物堆肥和生物固体堆肥作为生物覆盖物的混合物在温尼伯的一个封闭的垃圾填埋场内的现场规模的应用在氧化甲烷的功效。 将评估降水、环境温度和大气压力等气候因素对系统整体性能的影响，以确定生物填埋场覆盖物的概念是否能成功地应用于寒冷气候。拟议的研究将提供科学证据，使KGS集团有信心的应用垃圾填埋场生物覆盖在气候是恶劣和多变的马尼托巴的。生物覆盖物可能是在产量较低或较旧的垃圾填埋场捕获甲烷的最有效和最经济的解决方案，在加拿大以及气候寒冷的地区安装全面的气体收集系统在经济上不可行。此外，这项研究将找到一个可持续的解决方案，重新利用院子，并留下废物和生物固体作为垃圾填埋场生物覆盖物，这不仅有利于温尼伯市，但加拿大其他城市。

One of the major environmental challenges associated with landfills is the generation of landfill gases (LFGs) - primarily methane (CH4) and carbon dioxide (CO2). Microbially -mediated methane oxidation in landfill cover systems via a subset of bacteria known as "methanotrophs" has been widely accepted as a method to counter landfill methane emissions. Methanotrophs metabolize methane as their only source of carbon and energy and are naturally found in environments where there are sufficient concentrations of CH4 and CO2 to sustain their survival, such as the upper layers of a landfill cover soil. More recently, research has focused on methods to increase landfill CH4 oxidation by selecting suitable cover materials and amendments, such as composts, that induce favourable conditions for the growth of methanotrophs. Such cover systems that exploit the landfill methane oxidation process have been termed "bio-based" or "engineered" cover systems and have the potential to further reduce CH4 emissions. The overall objective of the proposed research is to assess the efficacy of a mixture of yard and leaf waste compost and biosolids compost as biocover in oxidizing methane within a field-scale application on a closed landfill in Winnipeg. The effect of climatic factors such as precipitation, ambient temperature, and atmospheric pressure on the overall performance of the system will be evaluated in order to determine if the concept of a biological landfill cover can successfully be applied to cold climates.**The proposed research will provide scientific proof that allows KGS Group to be confident of the application of the landfill biocover within a climate that is as harsh and varied as Manitoba's. The biocover can be the most effective and economical solution for capturing the methane at lower-producing or older landfills where it is not economically feasible to install a full-expanse gas collection system in Canada as well as areas with a cold climate. In addition, this research will find a sustainable solution to reuse of yard and leave waste and biosolids as landfill biocover which will not only benefit the City of Winnipeg, but other municipalities across Canada.****