Journal of Industrial and Engineering Chemistry, Vol.46, 62-67, February, 2017
Selective acidic elution of Ca from sewage sludge ash for phosphorus recovery under pH control
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Phosphorus (P) is recovered from sewage sludge ash (SSA) by selective HCl elution of Ca. Leaching and rearrangement of P were very fast and the amounts of leaching and recombination of P depend strongly on pH. pH control at 4.0 obtained selective elution ratio (Ca(%)/P(%)) of 20 by recombination of P to Al in SSA residue while it was 5.6 without pH control. XRD and element mass balance showed that Ca-P in the raw SSA was converted to Al-P complex during the acid pretreatment.
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