CEEFの湿式酸化処理過程における窒素収支測定技術の検討

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Wet oxidation treatment involves dissolution, ionization, gasification, and re-crystallization of elements in wastes during reaction, and thus these processes must be understood to reveal the material cycles in a closed system. In this study, monitoring methods of nitrogen, which is a major component of organic substances, were investigated for the first time to understand its behavior and balance using the wet oxidation unit for decomposing the plant materials at CEEF. The rice straw used as experimental material was cultivated at CEEF and contained 9.816 mg/g of nitrogen. In each operation, about 30 g of nitrogen was input from the specimen, of which 60 ∼ 67% was collected during the decomposition reaction in the form of nitrates in the processed solution. This percentage was much higher than the designed value, and the result was favorable, since the load on the ammonia and ammonium nitrate synthesis unit for treating excess nitrogen gas could be reduced less than we had predicted. The total amount of nitrogen in the system during operation was 124 ∼ 292 g. Some certain pattern was not seen in the relationship between the progress of treatment and the amount of total nitrogen in any of the three operation trials. This was found to be attributable to the fact that 80 ∼ 90% of total nitrogen was in gaseous form and the presence affected its behavior. The measurements showed precisely the actual amounts of input material, input nitrogen, and nitrogen collected in the processed solution. On the other hand, no stable balance was obtained for nitrogen gas, which accounts for the major proportion of total nitrogen, so methods should be optimized by increasing the number of gas sampling and sampling points.
生態工学会の論文
2005-04-30

CEEFの湿式酸化処理過程における窒素収支測定技術の検討

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