Modeling Decomposition of MSW in a Consolidating Anaerobic Reactor

Abstract

A numerical model is presented based on conceptual considerations of chemical and biological reaction processes in landfills. The model enables the details of mixed-culture population dynamics and locally based multiple reaction schemes to be described as functions of the chemical and physical environmental conditions. In its current stage of development, the model is primarily used as a research tool to analyze the influence and value of various model parameters on biodegradation and landfill gas formation processes. In order to test the accuracy of the model, simulation results have been compared with experimental data obtained from a 340-day experiment on the degradation of waste within a "consolidating anaerobic reactor (CAR)." A good match with simulated results was obtained to the measurement of methane and carbon dioxide formation, as well as to the measured concentrations of sulphate and ammonium ions in the liquid phase. In particular, the experimentally observed influence of sulphate on the methane formation could be modeled taking into account interactions between sulphate-reducing and methanogenic bacteria.

Effects of Temperature on the Long-Term Behaviour of Waste Degradation, Emissions and Post-Closure Management Based on Landfill Simulators

“…Among the landfill simulation studies the impact of temperature has been addressed experimentally in only a few cases. In the work of Reichel et al [21] an equation has been used, which indicates clearly over 10 % increase per 1°C in the range 20 -35 °C. However this value is connected to one simulator reactor containing old waste (with which hydrolysis should have a dominating role) and subjected to a single step temperature increase.…”

“…Recently efforts have been made to develop mathematical models and apply them to experiments performed with LSRs [20][21][22]. According to Valencia [23] the main limitation of models is the incorporation of temperature impacts.…”

Enhanced stabilisation of municipal solid waste in bioreactor landfills

“…The best-fit parameters such as bacterial growth rates were higher than the values reported by White et al (2003White et al ( , 2005. However, bacterial growth rate values were lower than the values used by Reichel et al (2007) which simulate, with a more accurate model, the same waste and reactors used by White et al (2003White et al ( , 2005. These best-fit parameters were determined after 31 simulations with LDAT; the best 5 simulations (Simulations 25,28,29,30 and 31) are reported here.…”

Theoretical analysis of municipal solid waste treatment by leachate recirculation under anaerobic and aerobic conditions

“…In order to arrive at a generic modeling framework, average compositions of the biodegradable fraction of Solid Organic Matter (SOM) of C 6 H 10 O 5 N 0.036 and C H 10 O 5 N 0.032 S 0.03 are used for respectively the anaerobic experiment and the aerobic experiment following generic principles of anaerobic digestion modeling ((Batstone et al, 2002, Reichel et al, 2007). The fractions of nitrogen and sulfur are deduced from the fractions measured in the MSW at the beginning and the end of the experiment.…”