Dissolution of Phosphate Ion from Incineration Ash of Sewage Sludge

概要

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Dissolution of phosphate ion from the incineration ash with dilute sulfuric acid was investigated in order to establish the recovery of useful ingredients from the incineration ash of sewage sludge. As a result, the concentration of the phosphorus was increased with the increase of the pH of the dilute sulfuric acid and reached the maximum at pH = 2. The concentration of the phosphorus, however, was decreased with the further increase of the pH of the dilute sulfuric acid.<BR>Dissolution of phosphate ion from the incineration ash in supersonic flow field was investigated. Consequently, the concentration of the phosphorus showed the maximum with the ultrasonic wave for two minutes. However, the concentration of the phosphorus decreased with increasing time above two minutes. As compared with the effect of agitation on the average dissolution rate, the rate with homogenizer was about 40-70 times faster than the rate with magnetic stirrer.
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