PARAMETRIC SENSITIVITY ANALYSIS OF HUMIC PHASE IN LANDFILL

Abstract: This paper presents the development of one dimensional mathematical model capable of simulating simultaneous processes of oxygen flow. It is based on some assumptions like the landfill assumed to behave as a bioreactor in which gas phase generation is over i.e. methanogenic is finished and the humic phase is started. This mathematical model actually describes the oxygen concentration in the landfill, leachate migration and capable of simulating simultaneous processes of water transport, leachate migration. The resulting governing equations in the form of partial differential equation (PDE) have been solved by separation of variables (analytical) and backward implicit scheme (BIS). The goal is to study the four transport parameters ( 2O 1 D, ,,andκ ε ν) on the oxygen concentration which results in degradation of refuse because after a long term processes in landfill, when all the remaining substrate becomes more and more resistant to degradation, microbial activity slows down and the humic phase is reached. During the humic phase, the available degradable organic material is either depleted or either the reactions are too slow to consume oxygen entering the landfill. The main focus is on to study the governing partial differential equations having four transport parameters and their affect on oxygen concentration