CUED Publications database

CFD modeling of hydro-biochemical behavior of MSW subjected to leachate recirculation

Feng, SJ and Cao, BY and Li, AZ and Chen, HX and Zheng, QT (2018) CFD modeling of hydro-biochemical behavior of MSW subjected to leachate recirculation. Environmental Science and Pollution Research, 25. pp. 5631-5642. ISSN 0944-1344

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Abstract

© 2017, Springer-Verlag GmbH Germany, part of Springer Nature. The most commonly used method of operating landfills more sustainably is to promote rapid biodegradation and stabilization of municipal solid waste (MSW) by leachate recirculation. The present study is an application of computational fluid dynamics (CFD) to the 3D modeling of leachate recirculation in bioreactor landfills using vertical wells. The objective is to model and investigate the hydrodynamic and biochemical behavior of MSW subject to leachate recirculation. The results indicate that the maximum recirculated leachate volume can be reached when vertical wells are set at the upper middle part of a landfill (HW/HT = 0.4), and increasing the screen length can be more helpful in enlarging the influence radius than increasing the well length (an increase in HS/HW from 0.4 to 0.6 results in an increase in influence radius from 6.5 to 7.7 m). The time to reach steady state of leachate recirculation decreases with the increase in pressure head; however, the time for leachate to drain away increases with the increase in pressure head. It also showed that methanogenic biomass inoculum of 1.0 kg/m3 can accelerate the volatile fatty acid depletion and increase the peak depletion rate to 2.7 × 10−6 kg/m3/s. The degradation-induced void change parameter exerts an influence on the processes of MSW biodegradation because a smaller parameter value results in a greater increase in void space.

Item Type: Article
Uncontrolled Keywords: Bioreactor landfill CFD simulation Leachate recirculation MSW Biodegradation, Environmental Bioreactors Models, Theoretical Refuse Disposal Solid Waste Waste Disposal Facilities Water Pollutants, Chemical
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 09 May 2018 20:10
Last Modified: 23 Jun 2020 12:47
DOI: 10.1007/s11356-017-0888-z