Impacts of temperature and liquid/solid ratio on anaerobic degradation of municipal solid waste: an emission investigation of landfill simulation reactors |
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Authors: | Yu Wang Markku Pelkonen |
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Institution: | (1) Department of Civil and Environmental Engineering, University of Texas at Arlington, Arlington, TX 76019, USA;(2) Bryant Consultants, Inc., Carrollton, TX 75006, USA |
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Abstract: | Management of landfill emissions, i.e., landfill gas (LFG) and landfill leachate, is an important and resource-intensive task.
A long-term demonstration pilot, consisting of landfill simulation reactors (LSRs), was used to study the impact of temperature
and the applied liquid/solid ratio (L/S ratio) on landfill emissions, characteristics, and trends. This pilot has already
run for more than 1000 days since the end of 2004 and will continue to run for some time. The degradation of waste at different
temperatures has impacts on the overall degradation degree and on the length of post-closure care required. Higher temperatures
accelerated the degradation, but also resulted in higher leachate chemical oxygen demand (COD) and ammonia concentrations,
which prolong the aftercare period. Meanwhile, at a given stabilization degree e.g., 70 l gas/kg waste (dry)], the total
leached nitrogen under psychrophilic conditions was 3.5 times that under mesophilic/thermophilic conditions, which resulted
in a higher required effort for leachate treatment. The impact of L/S ratio or simulated annual L/S rates was also evaluated.
The results show the significance of efficiently obtaining the targeted L/S ratio in order to achieve low landfill emission
potential. |
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