Precipitação de estruvita em lixiviado de compostagem para uso como fertilizante.

Nutrient 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.

Bibliographic Details

Main Authors:	INACIO, C. de T., MORAES, A. da S. de, CAMPOS, D. V. B. de, VENEU, D. M., RECH, I., LEAL, M. A. de A.
Other Authors:	CAIO DE TEVES INACIO, CNPS; AOLIBAMA DA SILVA DE MORAES, UFRRJ; DAVID VILAS BOAS DE CAMPOS, CNPS; DIEGO MACEDO VENEU, UFRJ; IONÁ RECH, RECH INSTRUTORA AGRÍCOLA; MARCO ANTONIO DE ALMEIDA LEAL, CNPAB.
Format:	Artigo de periódico biblioteca
Language:	Portugues pt_BR
Published:	Revista Virtual de Química, v. 14, n. 5, p. 870-876, 2022. 2022-04-25
Subjects:	Minerais de fosfato, Recuperação de nutrientes, Estrume animal, Nutrient recovery, Compostagem, Fosfato, Phosphate minerals, Animal manures, Composting,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1142346 http://dx.doi.org/10.21577/1984-6835.20220042
Tags:	Add Tag No Tags, Be the first to tag this record!