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Extracellular enzyme and microbial activity in MSW landfills with different gas collection and leachate management
Qiyong Xu1, Jie Qin1, Tugui Yuan1
1Key Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, Guangdong, 518055, China.
Abstract:
The performance of simulated municipal solid waste (MSW) landfills with two different biogas collection practices - (1) upward and upward-downward biogas flow collection (LT-TB) in sequence and (2) simultaneous upward-downward biogas flow collection (LTB) from the beginning of the anaerobic degradation process - was investigated in terms of landfill gas and leachate, enzyme activity, and microbial community structure associated with MSW compression and leachate recirculation. The cumulative methane volume in LTB was 1.5 times higher than that in LT-TB. With MSW compression and leachate recirculation, amylase and lipase activity were enhanced in LTB. In LT-TB, the activities gradually decreased after reaching a peak with compression. The two biogas collection strategies influenced the community structure and activity of bacteria and archaea. The upward and downward gas collection flow with waste compression and leachate recirculation improved the environment for enriching bacterial phyla Firmicutes, Proteobacteria, and Synergistetes and genus Methanosarcina in Archaea.
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