下水汚泥ケーキの環境リスク低減型炭化処理バイオマスに関する基礎的研究

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According to an official report, the annual total discharge of the sewage sludge in Japan shows a tendency to increase in more than 72 million tons in 1998. An efficient utilization technique should be developed to facilitate decreasing of sewage sludge, because the landfill cannot be accepted for the industrial waste any more.The purpose of this paper is to renovate the conventional treatment of the sludge with the decrease of the environmental impact, adding the convenience of the application and handling to it. An solidification technology was developed for making carbonized tablets from the sewage sludge through mixing the malt feed and zeolite as additive.Moreover, the thermal properties of the carbonized sludge, which was dependent on the temperature and the time of carbonization of it, were evaluated with thermal analyzers such as TG (thermogravimetry), DTA (differential thermal analysis), DSC (differential scanning calorimetry), and calorimeter.It was confirmed that the carbonized tablets had the high quantity as biomass, when they were produced at the lower temperature of 300 °C for 25 minutes to 75 minutes. The analytical results with calorimeter indicated that the heating value of the tablets were about 3,800 cal which was corresponded to nearly 60 % of the one of charcoal.The carbonized tablets made from the sewage sludge can be expected to make application as a fuel in the heating systems of greenhouses, factories, and households.
社団法人資源・素材学会の論文
2003-02-25

下水汚泥ケーキの環境リスク低減型炭化処理バイオマスに関する基礎的研究

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