A novel procedure for phosphorus (P) recovery as struvite from incinerated sewage sludge ash (ISSA) was proposed and investigated. The procedure is divided into three steps: transform P in the ISSA to amorphous iron phosphate (FeP) and aluminum phosphate (AlP) by acid washing followed by alkali precipitation, re-dissolve FeP and AlP via acid washing and adsorption of Fe and Al ions by a cation exchange resin (CER), and struvite crystallization. Results showed that about 80.4% P in the ISSA was successfully transformed to FeP and AlP accompanied by achieving the removal of most undesirable metals. Subsequently, Fe and Al ions in the leachate of completely re-dissolution of FeP and AlP in 2 N HCl were absorbed by CER to obtain a purified P solution. Over 99.0% of P in the purified P solution was recovered as struvite with a high purity (76.0%) and low heavy metal contents (Zn, Cu, As and Pb＜50 mg/kg) at a 1:1:1 M ratio of Mg: N: P and pH of 9.5. Overall, 79.7% P in the ISSA could be recovered as struvite with negligible environmental risk.
Journal of Cleaner Production – Elsevier
Published: Apr 20, 2018
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