Invited Session: Waste Management Challenges
Modeling Heat Generation at Landfills Experiencing Elevated Temperatures
Tuesday, September 26, 2017
9:00 – 9:30
A number of landfills in North America are experiencing elevated temperatures, and the underlying cause is not clear. Some of these elevated temperature landfills (ETLFs) have received industrial wastes that are known to release heat, but others have not. Elevated temperatures in landfills present many challenges including rapid settlement, elevated leachate strength, objectionable odors and changes in gas production and composition. In addition, elevated temperatures may damage gas and leachate collection systems. Research was conducted to develop a mathematical model to predict temperatures within landfills. The model accounts for all significant heat sources and sinks in landfills. Heat sources include energy from aerobic and anaerobic biological reactions, metal corrosion, acid-base reactions, hydration reactions, subsurface oxidation and pyrolytic reactions. In addition, the model accounts for energy that leaves the landfill in the leachate and gas, as well as evaporation and condensation. The governing equations for each of the heat sources and sinks will be presented, along with model simulations to illustrate model behavior and model response to changes in the composition of the buried waste.
By attending this presentation, participants will understand the different factors that contribute to heat generation and release from landfills. In addition, participants will appreciate appropriate actions to manage landfills with elevated temperatures.