| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Outline of Final Research Achievements |
In order to find a rational recovery method for phosphorus from sewage sludge, the developed fractionation method was applied to several kinds of sewage sludge. The results showed that 50 to 80 % of phosphorus in digestion sludge was the fraction of phosphate ion or insoluble phosphate and phosphorus composition was quite different from other sludge.
If we apply the acid treatment to digestion sludge with citric acid or acetic acid and crystallization of hydroxyapatite from filtrate of acidified digestion sludge, it was suggested that the phosphorus recovery ratio leached to almost double.
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