Author： Reddy Krishna R. Giri Rajiv K. Kulkarni Hanumanth S.
Publisher： The Journal of Solid Waste Technology and Management
ISSN： 1088-1697
Source： The Journal of Solid Waste Technology and Management, Vol.41, Iss.2, 2015-05, pp. : 203-218
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Abstract
Vertical wells (VW), commonly used for leachate recirculation in bioreactor landfills, have an advantage over other recirculation systems as they can be installed either during the construction of a landfill or after its closure. Currently, the design of VWs is based on very limited field and laboratory investigations and modeling studies that has resulted in a large variation in their performance in the field. The main objective of this paper is to perform a detailed parametric study using two-phase flow model and develop design charts for the rational design and operation of VWs. Effects of the leachate recirculation rate, hydraulic properties of the MSW, and depth of VW on MSW wetted diameter, wetted area, developed pore pressures (water and landfill gas), and the length of time to reach the steady-state condition are studied. Modeling was performed for both homogeneous and isotropic, and heterogeneous and anisotropic MSW (most representatives of field conditions). An example of the application of VWs is presented through the design charts for this field system that are developed as part of the study. Overall, the design charts provide useful guidance to the design and operation of VWs during leachate recirculation.
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