2014 Fiscal Year Final Research Report
Fractional recovery of phosphorus and heavy metals from sewage sludge incinerated ash based on acidic solubilization
| Project/Area Number |
24560670
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Fukui University of Technology |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
SHIMIZU Yoshihisa 京都大学, 大学院工学研究科, 教授 (20226260)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | リン回収 / 下水汚泥焼却灰 / 酸 / アルカリ / リン酸鉄 / リン酸アルミニウム / リン酸カルシウム |
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| Outline of Final Research Achievements |
In this study, the recovery of phosphate solution or calcium phosphate was attempted from sewage sludge incinerated ash, based on acid leaching of the incinerated ash and subsequent precipitation through iron phosphate and/or aluminium phosphate. The precipitaton of iron phosphate and/or aluminium phosphate from the acid leaching solution was performed at the pH of about 2 and 4, respectively. Adding sodium hydroxide, metals were separated from the precipitate, and phosphate was dissolved into the solution. It was confirmed that overall phosphorus recovery of 71-87% from the incinerated ash was possible with minimized heavy metal contents. On the other hands, it was indicated that heavy metals can be recovered as concentrated heavy metal solutions.
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| Free Research Field |
土木環境システム
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