下水汚泥炭化素材の機能特性に及ぼす製造条件の影響

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Sewage sludge is one of industrial wasts, and the production rate of the sludge is increasing every year. Many municipalities are dependent on incineration, smelting or landfill to reduce sewage sludge. However, landfill cannot accept the sewage sludge any more. Valid processes of sewage sludge are expected to decrease environmental risks and to increase the recycling rate of it. In order to solve these problems, carbonization process has been proposed.The purpose of this paper is to evaluate the functions of carbonized tablets made from sewage sludge as biomass, humidity control materials, and artificial soil of roof top greening. The chaff, of which sizes are 0.180mm to 0.212mm and 0.212mm to 0.355mm, and zeolite were used as moisture control materials for sewage sludge. The thermal properties of the carbonized sludge were analyzed with TG (thermogravimetry), DTA (differential thermal analysis), DSC (differential scanning calorimetry), and calorimeter. Heating value, or the calorific power, of the tablets, which were carbonized at the temperature of 300°C for 25minutes with the chaff of the sizes of 0.212mm to 0.355mm and 0.180mm to 0.212mm, was approximately 11.9kJ/g to 11.3kJ/g. It corresponds to nearly 80 % of that of chaff, so we conducted a combustion test with the tablets.The porous carbonized tablets are expected to function as humidity control materials for under floor of building and superior artificial soil of roof top greening. The vegetation monitoring tests of grass were investigated for a period of 120 days with carbonized tablets, zeolite, and charcoal. Moreover, for confirming the environmental risks of the tablets a leaching test of harmful substances from them was studied. The results showed that the concentration of heavy metal contaminant such as Pb, Cd could be controlled below the values of permitted loads.
社団法人資源・素材学会の論文
2006-07-25

下水汚泥炭化素材の機能特性に及ぼす製造条件の影響

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