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Journal of the Japan Institute of Energy Vol. 92 (2013), No. 2

ISIJ International
belloff
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753
Publisher: The Japan Institute of Energy

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  1. Vol. 103 (2024)

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  12. Vol. 92 (2013)

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  30. Vol. 74 (1995)

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Journal of the Japan Institute of Energy Vol. 92 (2013), No. 2

Pyrolysis Behavior of Biologically Dried Sewage Sludge: Change in Nitrogen Form during Heat Treatment

Hiroyuki NAKAGAWA, Fumio HITOMI

pp. 174-180

DOI:

10.3775/jie.92.174

Abstract

Biodrying processes that utilize the biological heat generated through the aerobic digestion of organic matter are believed to reduce the energy consumption for drying significantly, because supplementary fossil fuels are not required for these processes. In this study, the pyrolysis behavior of biologically dried sewage sludge used to obtain solid fuel or material is examined under heat treatment below 600 °C. We focus on the change in nitrogen form during heat treatment. Nitrogen contained in the dried sludge almost exists as Kjeldahl nitrogen, and a considerable amount of nitrogen remains in this form after heat treatment. Approximately 50% of nitrogen in the dried sludge is removed from the solid as volatile matter, including ammonia, when the sludge is heat-treated at 500 °C. The yield of ammonia is significantly larger than that of cyanides under the conditions applied for the heat treatment. It is concluded that a large amount of nitrogen in the volatile matter is present in the tar and is converted to ammonia upon further high-temperature pyrolysis of tar. The catalytic effect of minerals contained in the dried sludge is found to influence the gasification reactivity of the solid residue significantly.

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Comparative Study of Nutrient Supplements and Natural Inorganic Components in Ethanolic Fermentation of Nipa Sap

Pramila TAMUNAIDU, Shiro SAKA

pp. 181-186

DOI:

10.3775/jie.92.181

Abstract

The current study was initiated to explore the potential of nipa (Nypa fruticans) sap for bioethanol production in the presence of nutrient supplements and natural inorganic components available in the sap. Total chemical composition of nipa sap was 19.5 wt%, mainly composed of sucrose, glucose and fructose. Additionally, the elemental analysis of the sap gave 0.5 wt% inorganics with Na, K and Cl as its main components, corresponding to its habitat. Batch fermentative assays showed that the fermentation trend was similar between nipa and sugarcane sap with over 95% bioethanol yields in conditions with and without nutrient supplements. Further studies showed that, the natural inorganic components available in nipa sap played a significant role as nutrition materials for metabolic growth of microorganisms, consequently affecting the sap fermentability to bioethanol. As a whole, nipa sap showed some interesting characteristics in terms of fermentability without nutrient supplements making it a good alternative feedstock for bioethanol production.

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Comparative Study of Nutrient Supplements and Natural Inorganic Components in Ethanolic Fermentation of Nipa Sap

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