FACTORS AFFECTING THE STABILIZATION PERIOD OF SEWAGE SLUDGE IN SOIL WITH REFERENCE TO THE GEL CHROMATOGRAPHIC PATTERN
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概要
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Effects of the sludge loading rate, soil properties, dewatering agent in sludge, and incubation temperature on the stabilization period of dewatered sewage sludge in soil were investigated with reference to the gel chromatographic patterns of the water extracts from the soil-sludge mixtures. The stabilization period was defined as the period until which a specific pattern of the gel chromatogram appears, indicating both the presence of small amounts of free ammonia and the accumulation of nitrate nitrogen in soil. A high sludge loading rate above 5% resulted in a longer stabilization period, especially in the Fujimi loamy coarse sand soil. The stabilization period was shorter in the Hiratsuka coarse sandy loam soil than in the other two kinds of soils (Fujimi loamy coarse sand soil and Sekiya fine sandy loam soil). Lime, used as a dewatering agent, shortened the stabilization period at low sludge loading rates, but prolonged it at high sludge loading rates, compared with a polymeric organic coagulant. Temperature was the most significant factor to affect the stabilization period. As the temperature decreased from 25 to 5, the period of stabilization increased drastically. the stabilization process of sewage sludge in soil was interpreted as a process of nitrogen transformation consisting of ammonification and nitrification. The limiting step in the stabilization process was the nitrification step. The period was prolonged whenever nitrification was inhibited, while ammonification was little inhibited except at a low temperature.
- 社団法人日本土壌肥料学会の論文
著者
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正田 誠
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Katayama A
Nagoya Univ. Nagoya Jpn
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Kubota Hiroshi
Department of Chemistry, Faculty of Science, Kyoto University
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Shoda Makoto
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Katayama Arata
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Katayama Arata
Graduate Schooi Of Bioagricultural Sciences Nagoya University:(present Address)research Center For A
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Katayama Arata
School Of Agricultural Sciences Nagoya University
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Katayama Arata
Department Of Civil Engineering Nagoya University:department Of Civil Engineering Nagoya Universityd
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Kubota H
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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KUBOTA HIROSHI
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Hirai M
Center For Advanced Material Analysis Tokyo Institute Of Technology
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Hirai M
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Hirai Mitsuyo
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Kubota Hiroshi
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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Katayama Arata
Research Center For Advanced Waste And Emission Management Nagoya University
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Shoda Makoto
Research Lab. Resources Utilization Tokyo Institute Of Technology
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