Recommendation

In this study, the leachate collection and leachate head are obtained from simula-tion. The field data does not fully verify the simulation due to quality of field data.

For verifying the simulation by field data, the recommendation is listed below:

1. Currently, the leachate head is not monitored in Taiwan’s landfill. Leachate head should be monitored to provide vital information for enhancing effi-ciency of leachate treatment and status of slope stability of the landfill.

2. The rational method currently used for estimating leachate production and, in turn, the capacity of leachate treatment plant did not take into account the properties of the waste and LCRS, and thus often lead to significant over- or under-design of the capacity of leachate treatment plant. Based on the result of this study, it is suggested that the leachate water balance analysis should be performed for the design of LCRS and capacity of leachate treatment plant. In addition, the capacity of LCRS and leachate treatment plant can be optimized for maximum allowable leachate head and cost efficiency of leachate treatment by performing water balance analysis

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3. In this study, the number and size of pinholes of the geomembrane liner, hydraulic properties of the waste, and the hydraulic conductivity of LCRS are all assumed based on values obtained from the literature and best esti-mation. Future study using real values by field investigations is warranted in order to further assess the accuracy and feasibility of leachate water balance analysis.

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