Phosphate Recovery by Reactive Crystallization of Magnesium Ammonium Phosphate: Application to Wastewater

Izumi Hirasawa, Hiroyuki Nakagawa, Osamu Yosikawa, Masanori Itoh

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Abstract

In this study reactive crystallization of magnesium ammonium phosphate (MAP) has been studied experimentally in a batch agitated crystallizer. Operating conditions for selective crystallization of MAP were obtained. Under these conditions, batch crystallization experiments were performed, to obtain the behavior of concentration decrease in phosphate and magnesium ions, by changing the initial Mg/P ratio. It was recognized that the concentration decrease pattern affected the properties of produced crystals. A new process for removing ammonium and phosphate ions using a crystallization process was proposed for application to wastewater from sludge treatment processes.

Original languageEnglish
Pages (from-to)267-276
Number of pages10
JournalACS Symposium Series
Volume667
Publication statusPublished - 1997 Dec 1

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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