Development of an Open Channel Classification Technique for Solid Waste Incineration Bottom Ash to Accelerate Coastal Landfill Site Stabilization

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  • 海面埋立地の早期安定化のための焼却灰の開水路分級技術に関する研究

Abstract

Coastal landfill site stabilization is expected to be accelerated by the removal of the finer particle fraction (d<0.425 mm), which contains a large amount of pollutants and lowers the permeability of landfilled solid waste layers, from municipal solid waste incineration bottom ash. This study focused on a method of removing the finer particle fraction by putting incineration bottom ash into an open channel (open channel classification) and a verification test was conducted. In addition, development of a numerical model that can reproduce the motion of incineration bottom ash particles in an open channel was attempted. As a result, it was clarified that about 60% of the finer particle fraction could be removed by open channel classification. It was also made clear that the settling velocity of incineration bottom ash is slower than the theoretical settling velocity assuming a sphere; the settling velocity of incineration bottom ash of 0.425mm particle size is about 80% of the theoretical value. Moreover, it was demonstrated that the motion of incineration bottom ash particles can be reproduced by a numerical model using a Reynolds-averaged Navier-Stokes equation and an equation of motion by appropriately setting the degree of sphere for each particle size in incineration bottom ash.

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