Abstract
Municipalities output large amounts of solid waste into landfills, but degradation slows during the middle and late stages of treatment. Therefore, accelerating the treatment of degradable substances to achieve rapid stabilization, excavation, screening, and reuse would increase landfill utility and reduce economic costs. This article provides an aerobic degradation model for landfilled municipal solid waste that includes two types of biochemical reactions. Using degradable solid-phase organic matter and ammonia nitrogen as limiting substrates, an equation describing degradation over time was obtained. Both aerobic organic matter hydrolysis and the synchronous nitrification and denitrification reaction followed a kinetic, first-order equation. The influences of temperature, water content, oxygen concentration, and carbon to nitrogen ratio on the kinetic reactions were considered. Similarly, the exothermic reaction characteristics were considered. The model was applied to two previously conducted experiments. The results showed that the model can accurately reflect the degradation laws of various substances under aerobic degradation conditions. SDC and ammonia nitrogen were rapidly degraded and reached very low levels in a short time under aerobic conditions. This indicated that aeration has a significant effect on the degradation of aged waste, which can be used in the accelerated stabilization of aged landfills in the future.
Highlights
Municipalities produce a large amount of solid waste, and landfills are an important disposal method
The sum of the slow degradation cellulose (SDC) in the solid and liquid phases was taken as the initial carbon content; nitrogen-containing organic matter in solid and liquid phases was taken as the initial ammonia nitrogen content
SDC, total sugars, fats, and proteins; and each can be used as a restrictive sub0
Summary
Municipalities produce a large amount of solid waste, and landfills are an important disposal method. The first-order kinetic equation was used to describe the time-dependent process of each limited substrate, and the effects of temperature, moisture content, oxygen concentration, initial carbon nitrogen ratio, and other factors were considered so as to establish a complete set of a dynamic model that can reflect the changes of various substances of municipal solid waste under aerobic degradation conditions. It can provide the most basic biochemical parameters for landfill settlement, leachate generation, landfill gas release, etc., which can be further combined with the multi-coupling model in the future to provide a theoretical basis for the stability assessment and operation of landfills
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