Towards a methodology for recovering K-struvite from manure

BACKGROUND: This study provides a methodology for recovering two essential macronutrients (potassium and phosphorus) from the liquid fraction of manure. This methodology paves the way for K-struvite recovery from manure by determining the suitable operational conditions (pH and temperature). RESULTS: The theoretical operational conditions were established by modelling and experimentally adjusted with manure, achieving the highest recoveries (80% of P-recovery) at pH 10 and 38 °C when using a 10% manure solution. Then, the suitable operational conditions were evaluated using 0–10–50–100% manure solutions. The lowest percentages of manure (0–10%) favoured the co-precipitation of other products besides K-struvite (magnesium phosphate and magnesium hydroxide); and at the highest percentages of manure (50–100%), all the phosphate was recovered as K-struvite, but also the co-precipitation of magnesium hydroxide due to the Mg/P molar ratio applied (Mg/P = 2). Suspended particles acted as nuclei for heterogeneous nucleation and favoured the aggregation of crystals resulting in a star-asterisk form. CONCLUSION: The viability of the process was demonstrated, this study being the first proof-of-concept of K-struvite recovery from complex waste streams.

Informació addicional

  • Any: 2018
  • Autors: Tarragó, E., Ruscalleda, M., Colprim, J., Balaguer, M.D., Puig, S.
  • Referència: Journal of Chemical Technology and Biotechnology Volume 93, Issue 6, June 2018, Pages 1558-1562

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Laboratori d’Enginyeria Química i Ambiental

Institut de Medi Ambient
Universitat de Girona
Campus Montilivi
17003 Girona

Parc Científic i Tecnològic de la UdG
Edifici Jaume Casademont, Porta B
Pic de Peguera, 15
17003 Girona
Tel. +34 972 41 98 59



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