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Waste Management & Research
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What's this?

A model to estimate the methane generation rate constant in sanitary landfills using fuzzy synthetic evaluation

Anurag Garg

Department of Civil Engineering, University of Calgary, Calgary, Alberta, Canada

Gopal Achari

Department of Civil Engineering, University of Calgary, Calgary, Alberta, Canada, gachari{at}ucalgary.ca

Ramesh C. Joshi

Department of Civil Engineering, University of Calgary, Calgary, Alberta, Canada

This paper presents a model using fuzzy synthetic evaluation to estimate the methane generation rate constant, k, for landfills. Four major parameters, precipitation, temperature, waste composition and landfill depth were used as inputs to the model. Whereas, these parameters are known to impact the methane generation, mathematical relationships between them and the methane generation rate constant required to estimate methane generation in landfills, are not known. In addition, the spatial variations of k within a landfill combined with the necessity of site-specific information to estimate its value, makes k one of the most elusive parameters in the accurate prediction of methane generation within a landfill. In this paper, a fuzzy technique was used to develop a model to predict the methane generation rate constant. The model was calibrated and verified using k values from 42 locations. Data from 10 sites were used to calibrate the model and the rest were used to verify it. The model predictions are reasonably accurate. A sensitivity analysis was also conducted to investigate the effect of uncertainty in the input parameters on the generation rate constant.

Key Words: Landfill gas • methane generation rate constant • municipal solid waste • fuzzy model • wmr 831-2

Waste Management & Research, Vol. 24, No. 4, 363-375 (2006)
DOI: 10.1177/0734242X06065189
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?