fepo4.2h2o Recovery from Acidic Phosphate-Rich Waste Streams

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fepo4.2h2o Recovery from Acidic Phosphate-Rich Waste Streams

Nouran T. Bahgat, Aamash Siddiqui, Philipp Wilfert, Leon Korving, Mark C.M. van Loosdrecht

Phosphorous not only needs to be removed to prevent eutrophication of wastewater effluent receiving surface water bodies, but it also has to be recovered as a scarce finite reserve. Phosphorus chemical precipitation as NH4MgPO4·6H2O, Ca3(PO4)2, or Fe3(PO4)2 ·8H2O is the most common method of phosphorus recovery from phosphorus-rich streams. These minerals ideally form under neutral to alkaline pH conditions, making acidic streams problematic for their formation due to the need for pH adjustments. This study proposes FePO4 .2H2O (strengite-like compounds) recovery from acidic streams due to its simplicity and high efficiency, while also avoiding the need for pH-adjusting chemicals.

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