淡水循環式養殖システムから排出される堆積物の化学的分解による液肥化

概要

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Solubilization of nitrogen and mineral in aquacultural solid waste discharged from freshwater recirculating fish culture system was attempted by using a microwave heating system in order to use it for production of liquid fertilizer. Solubilization rates of nitrogen, phosphorus, calcium, magnesium, sodium, potassium, iron, zinc, manganese and copper were determined after digestion of solid wastes with hydrogen peroxide and sulfuric acid and microwave heating in closed Teflon vessels. The treatments of 40 or 200 mmol g-1 solid waste (SW) of hydrogen peroxide at 125℃ were effective to elute nitrogen and magnesium and the solubilization of phosphorus, calcium, ion, zinc manganese and copper were below 10 %. However, the solubilization rates of these elements were not sufficient for the utilization. Based on the above result, digestions with 0.1, 1, and 10 mmol g-1 SW of sulfuric acid at 175℃ were conducted after digesting with 40 mmol g-1 SW in hydrogen peroxide. In the digestion with 10 mmol g-1 SW of sulfuric acid, more than 80 % of quantum in all the elements dissolved out from the waste, while the digestions with lower concentrations of sulfuric acid was not be effective. The result indicates that addition of more than 40 mmol g-1 SW of hydrogen peroxide and 10 mmol g-1 SW of sulfuric acid was efficacious for the solubilization of solid waste.
生態工学会の論文
2009-07-31