直燃式溶融炉による下水汚泥の溶融処理

概要

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As a method of wastewater-sludge treatment, a slagging process using a cylone furnace was tested. This furnace makes dried sludge change to combustible gas, which is burned in this furnace and used as the heat source of melting, and to molten slag. It would be possible, furthermore, to use this slag for construction materials.The results of the test were as follows:1) Pulverising treatment was not needed; dried sludge of 0.8∼1.8mm diameter was applicable for this process.2) The amount of NOx gas was low because of effect of two staged combustion.3) Leaching of heavy metals from the slag was very low compared with regulation values.4) The conversion ratio from inorganic materials in sludge to molten slag was over 95%.
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