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The Mountain View Controlled Landfill Project Field Experiment

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305, U.S.A.

A.N. Findikakis

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305, U.S.A.

C. Papelis

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305, U.S.A.

J.O. Leckie

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305, U.S.A.

The Mountain View controlled landfill project was undertaken in response to the need to optimize energy recovery from landfills, accelerate stabilization, and control gas migration and explosion hazards in the vicinity of landfills. The major objectives of the project were (1) to test the hypothesis that both yield and rate of landfill methanogenesis can be increased by controlling specific conditions within a landfill bioreactor, and (2) to quantify landfill gas production in a field-scale experiment with complete gas recovery so that a measure of landfill gas recovery efficiency can be established. Of particular importance for the design of the field experiment were the synergistic effects of moisture content, seed, and buffer additions on methanogenesis in landfilled municipal solid wastes. The experiment included six landfill cells considered as representative of actual landfills. The effect of moisture content, seed, and buffer was studied in terms of the water content of the refuse additions mixture on a total weight basis, the ratio of organic sludge dry solids to refuse dry solid (seed/nutrient), and the ratio of buffer solids to water present in the refuse/additions mixture.

Key Words: Municipal refuse • solid wastes • managed landfill • methane production • gas migration • gas recovery • field experiment • methanogenesis • biogas • bioreactor.

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