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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
A Recycling Technique of Iron Phosphate Containing Sludge
Author(s)
Takahashi Masaaki1*, Takemoto Yukimasa1 and Hukaya Yuriko2
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DOI:10.17265/2161-6213/2015.5-6.009
Affiliation(s)
1. Yokkaichi University, Faculty of Environmental and Information Science, Mie, 512-8512 Japan 2. Sharp Corporation, AVC Liquid Crystal Display Group, Kamevama, Mie, 519-0169 Japan
ABSTRACT
In the processes of wastewater treatment,
significant amounts of iron phosphate containing sludge is discharged. One of
the recycling methods of this sludge, alkalization treatment is investigated. aq.
solution of sodium hydroxide is added to the dehydrated sludge.
Iron phosphate in the sludge react with sodium hydroxide, forming sodium
phosphate and iron hydroxide containing-sludge at room temperature. The
recovered phosphorus contained 91% of phosphorus as the form of Na3PO4, and
iron hydroxide-containing residue has 93% of iron as Fe2O3.
KEYWORDS
Iron phosphate, sludge, sodium phosphate, recycle.
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