Phosphorus
(P) and potassium (K) are non-renewable materials and widely in many industries such as agriculturalsectors. 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.e. incinerated of activated sludge and
coffee husk biochar, respectively. The present study was conducted recovery of
P and K as struvite-K (KMgPO4·6H2O)
precipitates. The results showed that aluminium 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 HNO3 and the solution was
mixed with KH2PO4 and MgCl2·6H2O
as source of K and Mg, respectively. The
results showed aluminium (Al)was removed with precipitate K:P of 0.5, and
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