返流水のMAP法を用いた処理  [in Japanese] MAP (magnesium ammonium phosphate) Crystallization for Phosphorus Removal from Side Streams.  [in Japanese]

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Abstract

A magnesium ammonium phosphate (MAP) crystallization process that works by addition of magnesium seed crystals was used to phosphorus (PO<SUB>4</SUB>-P<50g·m<SUP>-3</SUP>) removal from side streams from sludge dewatering and thickening processes. Using a bench scale reactor, which consisted of a bubble column with draught and settling tubes, the optimum operational conditions were determined to be: reaction time 2hr, pH 8.9-9.1, molar ratio of Mg/P = 1.0 and an excess of NH<SUB>4</SUB>-N, under these conditions the maximum amount of crystallization occurred.

Journal

  • ENVIRONMENTAL ENGINEERING RESEARCH

    ENVIRONMENTAL ENGINEERING RESEARCH (39), 297-306, 2002

    Japan Society of Civil Engineers

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