Phosphorus (P) and potassium (K) are non-renewable materials and widely in many industries such as agricultural sectors . On the other hand, the demand of P and K as fertilizers increases which following global population. The nutrient source of P and K which get from biomass waste <i> i.e.</i> incinerated of activated sludge and coffee husk biochar, respectively. The present study was conducted recovery of P and K as struvite-K (KMgPO 4 ·6H 2 O) precipitates. The results showed that alu minium was released simultaneously with P from incinerated activated sludge with precipitate of Al:P of 1:1, K:P of 0.5, and Mg:P of 3. However, aluminium was inhibited to form struvite-K. Then, we examined cation removal especially for removed Al by dissolved 0.5 M HNO 3 and the solution was mixed with KH 2 PO 4 and MgCl 2 ·6H 2 O as source of K and Mg, respectively. The results showed a luminium (Al) was removed with precipitate K:P of 0.5, and Mg:P of 0.8. This study was confirmed that recovery of biomass incinerated was successful as struvite-K and can be used as fertilizers.
KeywordsStruvite-KRecovery of Biomass WasteCoffee HuskSludge WastePrecipitates
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