Effect of heating treatments on nitrogen mineralization from sewage sludge(Fertilizer and Soil Amendmetns)
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概要
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Heating of sewage sludge has multifunctional benefits for agricultural recycling of sludge, one of which is the heat-induced changes in N mineralization from the sludge. To enhance the understanding and practical use of this phenomenon, we subjected sewage sludge to heating treatments at 120℃ or 180℃ for 16 h with or without air-drying as a pretreatment. During the 84-day aerobic incubation period, N mineralization from the sludge mixed with samples of an Andosol, a Fluvisol, an Arenosol and an Acrisol was significantly accelerated by the heating of air-dried sludge at 120℃ and was significantly retarded by heating at 180℃, regardless of the soil types and temperatures during the incubation period. More conventional heat-drying of moist sludge at 120℃ or 180℃ also exerted similar but less pronounced effects. These heat-induced changes were attributed to the transformation of sludge organic N, because volatilization of N during the heating treatments was negligible. Sequential extraction of sludge N enabled detection of the heat-induced N transformations accounting for some but not all of the incubation results, indicating that mineralization of N in the heated sludge materials was determined not only by chemical extractability but also by other factors. Our results suggest that heating of sewage sludge regulates the rate of N mineralization and presents a promising method for producing various organic N fertilizers from sewage sludge.
- 社団法人日本土壌肥料学会の論文
著者
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MORITSUKA Naoki
Faculty of Life and Environmental Science, Shimane University
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MATSUOKA Kaori
Faculty of Life and Environmental Science, Shimane University
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Matsuoka Kaori
Faculty Of Life And Environmental Science Shimane University
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Matsui Kensuke
Research And Development Division Kurita Water Industries Ltd
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Masunaga Tsugiyuki
Faculty Of Life And Environmental Science Shimane University
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Wakatsuki Toshiyuki
Faculty Of Agriculture Kinki University
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Moritsuka Naoki
Faculty Of Life And Environmental Science Shimane University
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