Abstract
Leachate contains a wide variety of chemical substances. Therefore, evaluating the combined effects of chemical substances in leachate by only Ministerial Ordinance control values is not sufficient. So, a leachate evaluation method that can complement chemical analysis is needed. An additional problem is that the stabilization of leachate generally takes a long time after the closure of a landfill. The purpose of this study was to determine a leachate management method for evaluating the stabilization of landfill by applying a bioassay that can comprehensively evaluate the leachate. We have developed a bioassay using Tanichthys albonubes and Daphnia magna that can easily obtain results with a small amount of water and a short evaluation time of 24 hours, and we have defined a landfill stabilization index. We found that evaluations by this method using bioassay could be used for monitoring landfill leachate as one landfill stabilization indicator.
