Usage of phosphoric acid plant’s circulate pond waters in struvite precipitation : effect of conditions
Tuomikoski, Sari; Sauvola, Emilia; Riponiemi, Marko; Lassi, Ulla; Pesonen, Janne (2023-01-19)
Tuomikoski, S., Sauvola, E., Riponiemi, M., Lassi, U. & Pesonen, J. (2023) Usage of phosphoric acid plant's circulate pond waters in struvite precipitation—Effect of conditions. Water and Environment Journal, 37(3), 445–453. Available from: https://doi.org/10.1111/wej.12848
© 2023 The Authors. Water and Environment Journal published by John Wiley & Sons Ltd on behalf of CIWEM. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
https://creativecommons.org/licenses/by-nc/4.0/
https://urn.fi/URN:NBN:fi-fe202301306551
Tiivistelmä
Abstract
Struvite is a suitable fertilizer, and electrochemical precipitation of nutrients from industrial waters provides one answer to the circular economy. Molar ratio between ammonium and phosphate is crucial: Water suitable for the precipitation includes more or at least the same amount ammonium than phosphate. That kind of water typically does not exist in industry. Therefore, ammonium-rich industrial water was mixed with phosphorus-rich water to obtain a suitable molar ratio for struvite precipitation. Parameters were studied to determine their effect on removal-% and struvite yield. 100% struvite yield was obtained under several conditions even without pH control with pH 7–9. The highest phosphate removal (99.7%) was occurred with the molar ratio 1.7:2:1 for Mg:NH₄:PO₄ (pH 9.0). Waters dilution prevents magnesium anode corrosion. Formed struvite has potential as recycled fertilizer due to low bioavailability of metals and high leachability of nutrients studied by four-stage sequential leaching.
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