A Recycling Technique of Iron Phosphate Containing Sludge
نویسنده
چکیده
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. Key word: Iron phosphate, sludge, sodium phosphate, recycle.
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