CUED Publications database

Modeling of leachate recirculation using vertical wells in bioreactor landfills

Feng, SJ and Cao, BY and Zhang, X and Xie, HJ (2015) Modeling of leachate recirculation using vertical wells in bioreactor landfills. Environmental Science and Pollution Research, 22. pp. 9067-9079. ISSN 0944-1344

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Abstract

© 2015, Springer-Verlag Berlin Heidelberg. Leachate recirculation (LR) in municipal solid waste (MSW) landfills operated as bioreactors offers significant economic and environmental benefits. The subsurface application method of vertical wells is one of the most common LR techniques. The objective of this study was to develop a novel two-dimensional model of leachate recirculation using vertical wells. This novel method can describe leachate flow considering the effects of MSW settlement while also accounting separately for leachate flow in saturated and unsaturated zones. In this paper, a settlement model for MSW when considering the effects of compression and biodegradation on the MSW porosity was adopted. A numerical model was proposed using new governing equations for the saturated and unsaturated zones of a landfill. The following design parameters were evaluated by simulating the recirculated leachate volume and the influence zones of waste under steady-state flow conditions: (1) the effect of MSW settlement, (2) the effect of the initial void ratio, (3) the effect of the injected head, (4) the effect of the unit weight, (5) the effect of the biodegradation rate, and (6) the effect of the compression coefficient. The influence zones of LR when considering the effect of MSW settlement are smaller than those when neglecting the effect. The influence zones and LR volume increased with an increase in the injection pressure head and initial void ratio of MSW. The proposed method and the calculation results can provide important insight into the hydrological behavior of bioreactor landfills.

Item Type: Article
Uncontrolled Keywords: Biodegradation, Environmental Bioreactors Models, Theoretical Permeability Porosity Refuse Disposal Waste Disposal Facilities Water Pollutants, Chemical
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 23 Nov 2017 02:28
Last Modified: 23 Jun 2020 12:42
DOI: 10.1007/s11356-014-4045-7