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The advantage of magnesium ammonium phosphate (MAP) precipitation method is the integrate of wastewater treatment and resources recovery. But generally, there have Ca2+ and Mg2+ in the wastewater, so there may have MAP and hydroxyapatite (HAP) simultaneously in the precipitate. The MAP can be used as slow release fertilizer directly; the HAP is just used as industrial raw material. So, the value of...
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