Title:	Performance of alternative magnesium sources for phosphorus recovery by struvite precipitation.
Authors:	FREIRE, P. M. L. de A. SILVA, R. L. CAMPOS, D. V. B. de INACIO, C. de T.
Affiliation:	PATRÍCIA M. L. DE A. FREIRE, UNIVERSIDADE FEDERAL DO RIO DE JANEIRO RAFAELA L. SILVA, UNIVERSIDADE DO ESTADO DO RIO DE JANEIRO DAVID VILAS BOAS DE CAMPOS, CNPS CAIO DE TEVES INACIO, CNPS.
Date Issued:	2025
Citation:	Revista Brasileira de Engenharia Agrícola e Ambiental, v. 29, n. 1, e285247, 2025.
Description:	Struvite (NH4 MgPO4 ∙6H2O) is a slow-release fertilizer obtained through phosphorus and/or nitrogen recovery from wastewaters, usually by adding magnesium salts. In this sense, the aim was to evaluate the viability of replacing commercial magnesium sources with alternative ones in the struvite precipitation process regarding ammonium and phosphate removal and precipitated crystal quantification and characterization. Experiments were conducted on a bench scale in a completely randomized design at pH 9.5 by precipitation of synthetic wastewater solution with four magnesium sources: MgCl2 ∙6H 2 O, MgSO 4 ∙7H 2 O, MgO, and magnesite (MgCO3 ). After pre- acidification, derived solutions from low-cost alternative sources of magnesium removed above 55 and 90% of ammonium nitrogen and phosphate in solution, respectively, and reached around 10 g L-1 of precipitated crystals. Results proximity obtained with solutions derived from commercial sources of magnesium (46ꟷ56% of ammonium nitrogen removal, 97% of phosphate removal, and more than 6 g L-1 of precipitate formed) indicated that alternative reagents could easily substitute commercial ones if submitted to the previous digestion process, making magnesium available in solution. Qualitative analysis by X-ray diffraction confirmed the presence of both struvite and newberyite in most precipitates.
Thesagro:	Fosfato
NAL Thesaurus:	Phosphates Magnesite
Keywords:	Amônio Magnesita Ammonium
DOI:	http://dx.doi.org/10.1590/1807-1929/agriambi.v29n1e285247
Notes:	Título em português: Desempenho de reagentes alternativos de magnésio para recuperação de fósforo por precipitação de estruvita.
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPS)