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Municipal Solid Waste (MSW) landfills produces biogas as a result of polymer degradation and fermentation of available organic matter. Efforts to capture this methane (CH4) rich biogas for downstream transformations are actively employed in landfilling operations, however unfavorable concentrations of CH4 are a problem. The goal of this project is to stimulate biomethanation in –vitro within MSW microcosms while addressing the following research questions: • Does the exogenous addition of different mesh sizes of ZVI alter rates of CH4 production or total CH4 volume generated? • Are certain concentrations of ZVI favored, such as 0.1 g/L, 1 g/L, and 5g/L, accordingly to a ZVI mesh size’s varying reactivity? • Can evidence of the ZVI oxidation be observed in common MSW leachate metrics, such as pH and conductivity? Municipal Solid Waste (MSW) is the collection of everyday items that are discarded by a local community. The waste contains various organic and inorganic items such as food scraps, paper, plastic, and wood. Due to rapid population increases and vast development; MSW is becoming an issue. Many waste management operations are looking into ways to minimize overhead costs, increase the capacity of landfills, and/or enhance biodegradation of the MSW at a faster rate1. Methanogens are microorganisms from the domain Archaea that produce CH4 in anoxic conditions such as landfills. Certain methanogens can use H2, including H2 produced by cathodic depolarizationmediated oxidation ZVI to produce methane2. In this project, enhancing methanogensesis by utilizing ZVI as an exogenous H2 source was looked to as a possible solution to this problem.

ENHANCED BIOMETHANATION FROM MUNICIPAL SOLID WASTE (MSW):CONCENTRATION AND MESH SIZE EFFECTS OF ZERO VALENT IRON (ZVI)-MEDIATED HYDROGEN PRODUCTION