A dual-permeability hydro-biodegradation model for leachate recirculation and settlement in bioreactor landfills
2018
Feng, Shi-Jin | Bai, Zhen-Bai | Chen, Hong-Xin | Cao, Ben-Yi | Lu, Shi-Feng | Chen, Yun-Min
A dual-permeability hydro-biodegradation model is developed to describe the leachate flow in municipal solid waste (MSW) and predict the long-term settlement induced by biodegradation in bioreactor landfills. The model is verified against Hydrus-1D and a recirculation experiment conducted in a full-scale landfill. Preferential flow and mass transfer between fissure and matrix can be reasonably modeled by the proposed model. A higher recirculation flow rate can speed up the stabilization process of landfill. However, too much recirculation leachate is not economical and environmental friendly. A stabilization speed index and a leachate utilization index are adopted to evaluate the stabilization speed of bioreactor landfill and utilization rate of leachate, respectively, and the optimal recirculation flow rate is estimated. A flow rate of q = 5 × 10⁻⁵–5 × 10⁻⁴ m/h (equivalent to recirculation intensity of Q = 15–150 L/tonwₐₛₜₑ/year) is recommended for recirculation, which has been verified by the field data in numerous bioreactor landfills.
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