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[Optimal formation conditions and analytical methods of the target product by MAP precipitation].
Hao, Xiao-Di; Lan, Li; Wang, Chong-Chen; van Loosdrecht, M C M.
Afiliação
  • Hao XD; Research & Development Centre of Sustainable Environmental Biotechnology, Beijing University of Civil Engineering and Architecture, Beijing 100044, China. haoxiaodi@bucea.edu.cn
Huan Jing Ke Xue ; 30(4): 1120-5, 2009 Apr 15.
Article em Zh | MEDLINE | ID: mdl-19545017
In order to establish optimal conditions of the struvite (MAP: MgNH4PO4 x 6H2O) formation, acid dissolution was applied and developed to perform element analyses on the precipitates obtained from MAP precipitation, and a novel analyzing and calculating method was developed to quantitatively determine the struvite content (purity) in the harvested precipitates according to the NH4+-N content. With this method, the purities of struvite were respectively determined for both ultra pure water and tap water used as solutes. At the same time, the effect of pH and Ca2+ on the formation and crystallization of struvite was evaluated. The newly developed method was effective enough to determine the purities of struvite, which could be a better method than qualitative X-ray diffraction (XRD). Based on the developed method, it was found that the optimal pH ranges for having a high struvite content (> 90%) were respectively at 7.5-9.0 with ultra pure water as solute and at 7.0-7.5 with tap water as solute. In real wastewater, Ca2+ at pH > 8.0 might result in impurities rather than struvite. Therefore, a neutral pH range (< 8.0) is proposed to perform struvite precipitation in wastewater.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fosfatos / Eliminação de Resíduos Líquidos / Cálcio / Compostos de Magnésio / Purificação da Água Tipo de estudo: Qualitative_research Idioma: Zh Revista: Huan Jing Ke Xue Ano de publicação: 2009 Tipo de documento: Article País de afiliação: China
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Fosfatos / Eliminação de Resíduos Líquidos / Cálcio / Compostos de Magnésio / Purificação da Água Tipo de estudo: Qualitative_research Idioma: Zh Revista: Huan Jing Ke Xue Ano de publicação: 2009 Tipo de documento: Article País de afiliação: China