Heat and Gas Flow Analysis in Semiaerobic Landfill

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Abstract
Flow parameters in governing differential equations include thermal conductivity, rate of energy production, heat transfer coefficient, and aeropermeabilities in solid waste. These are determined by the least squares using the simplex and finite element methods. The minimizing procedure requires measured values from the experiment such as temperatures in the solid waste, air influx from the leachate collection line at the bottom of the experimental vessel, and the surrounding temperature and pressure. Computed results show that thermal energy is produced in a semi-elliptic region of solid waste above the air inlet by aerobic biochemical reaction, and the vertical aeropermeability is ten times larger than the lateral one. The method applies to the design of sanitary landfill subjected to the natural convection of air.

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