Abstract
A coastal final disposal site is important and essential infrastructure for our country. However, decomposing of organic matters and washout of contamination components are very slow in that place and there is a concern about accelerated stabilization. Moreover, it is known that the fine particle fraction of municipal solid waste incineration ash contains more contamination components, therefore removing the fine particle fraction from municipal solid waste incineration bottom ash will reduce the contamination of sea water in the final disposal site. Therefore, the purpose of the study is to clarify the effects of removing the fine particle fraction on the stabilization of coastal final disposal site.
In order to achieve the purpose of this study, experiments using a large scale tank filled with the bottom ash imitating a coastal final disposal site were conducted two times. At the first time, the bottom ash without classification treatment was filled in the tank. At the second time, the bottom ash after removing the fine particle fraction was filled in the tank. After the filling, sea water flow was given in the tank, and the pH, EC, total organic carbon and total nitrogen of pore water and leachate were analyzed. Also, the flow rate of leachate was measured to know the permeability of the sedimentary bottom ash layer. As a result, it was demonstrated that the removing fine particle fraction increased permeability of the sedimentary layer and reduced concentrations of contamination components in leachate.
Therefore, the removing fine particle fraction has the effect on increasing permeability of the sedimentary bottom ash layer and improving.
