02386naa a2200301 a 450000100080000000500110000800800410001902400550006010000210011524501110013626000090024752014820025665000190173865000150175765000230177265000160179565000120181165300190182365300240184265300220186665300320188870000240192070000240194470000170196870000130198570000220199877300640202021423462022-11-22       2022    bl uuuu     u00u1 u    #d7 ahttp://dx.doi.org/10.21577/1984-6835.202200422DOI1 aINACIO, C. de T.  aPrecipitação de estruvita em lixiviado de compostagem para uso como fertilizante.h[electronic resource]  c2022  aNutrient recovery from agro-industrial effluents as precipitate minerals for use as fertilizers in agriculture is a promising strategy to reach sustainability. Struvite precipitation (MgNH4PO4.6H2O) is one of the most studied methods for phosphorus (P) recovery from waste waters; its use as a slow-release fertilizer has been often tested. This method also allowed the potassium (K) recovery as K-struvite (MgKPO4 .6H2O). The leachate has been considered as a major threat of composting facilities to the environment - due to its high biochemical oxygen demand and nutrient content (K, N e P). The leachate from a composting of horse bedding manure and left vegetables from an agro-processing industry showed high content of K (2,256 mg L -1), and low levels of ammoniacal nitrogen (217 mg L-1) and P (83 mg L-1). Adding soluble sources of phosphorus (H 3PO4) and magnesium (MgCl2) followed by pH adjusting (8 to 10), we reached the simultaneous formation of NH 4-struvite and K-struvite, as evidenced by X-ray diffraction. Besides composting leachate, struvite precipitation might be a feasible route to other agro-industrial waste waters with high K and N.  Este estudo objetivou avaliar a composição de nutrientes do lixiviado da compostagem de esterco de cavalo e sobras de hortaliças de uma agroindústria de processamento mínimo e o potencial para a recuperação de nitrogênio amoniacal (NH 4+) e potássio (K) na forma de estruvita em condições de laboratório.  aAnimal manures  aComposting  aPhosphate minerals  aCompostagem  aFosfato  aEstrume animal  aMinerais de fosfato  aNutrient recovery  aRecuperação de nutrientes1 aMORAES, A. da S. de1 aCAMPOS, D. V. B. de1 aVENEU, D. M.1 aRECH, I.1 aLEAL, M. A. de A.  tRevista Virtual de Químicagv. 14, n. 5, p. 870-876, 2022.