Abstract
Background:In bio-reactor landfills, both moisture and temperature have a significant impact on the bio-degradation processes. In order to speed up the leachate recirculation, a new drainage system is proposed to build a space network of bonded whole waste tyres in landfills.Objective:In this study, a coupled dual-permeability flow and the heat transfer model was constructed to study the interaction between leachate migration and temperature evolution.Results and Conclusion:The established model was applied to a simplified bio-reactor landfill and the simulation results demonstrated that the presence of waste tyres could significantly speed up the heat transfer. And the intermittent injection and the varying injection pressure might affect the distribution of temperature as well. Additionally, cooling the leachate injected could be another measure in avoiding the occurrence of hot spots in landfills.
Highlights
In recent years, bioreactor landfills have become an innovative and efficacious means for the safe disposal of Municipal Solid Waste (MSW) and biogas harvesting [1, 2]
A landfill operator requires that the waste tyres should be baled prior to delivery because it will be easier to handle, help save the valuable landfill space, and will have a greater potential for recovery in the future [38]
The effectiveness of leachate recirculation was found to be improved by the decreasing dynamic viscosity of leachate due to the increasing temperature, which implies the importance of including the interaction between leachate seepage and heat transfer
Summary
Bioreactor landfills have become an innovative and efficacious means for the safe disposal of Municipal Solid Waste (MSW) and biogas harvesting [1, 2]. The collected leachate is recycled into municipal solid waste, eventually increasing the water content and accelerating the biodegradation of municipal solid waste [4 - 9]. The field data has proved the more rapid degradation and distinctly higher proportion of methane of the landfill with leachate recirculation compared with those without recirculation [11]. Leachate recirculation can maximize the efficiency and waste volume reduction rate of landfill sites [12]. The leachate should be recirculated to all part of landfills by the employment of a recirculation system, because non-uniform distribution could result in shortcircuiting which could reduce gas production rate [13]. In order to speed up the leachate recirculation, a new drainage system is proposed to build a space network of bonded whole waste tyres in landfills
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