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http://dx.doi.org/10.17137/korrae.2022.30.1.33

Relationship of Magnesium Source and MAP Crystallization Efficiency  

Ahn, Johwan (Hankyung E&C Co., Ltd.)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.30, no.1, 2022 , pp. 33-39 More about this Journal
Abstract
Batch experiments were conducted to find out the effects of various types of magnesium compounds on phosphorus recovery by magnesium ammonium phosphate (MAP) crystallization. The phosphorus recovery from the centrate of anaerobic digested sludge was performed using magnesium chloride, magnesium hydroxide and magnesium oxide under different pH (7.5, 8.0 and 8.5) and Mg/P molar ratio (1.0, 1.5, 2.0, 2.5) conditions. The phosphorus recovery rate increased with increasing pH and Mg/P molar ratio in all magnesium compounds. At pH 7.5, magnesium oxide showed the highest phosphorus recovery rate, followed by magnesium hydroxide and magnesium chloride. However, at pH 8.5, more than 90% of phosphorus recovery rate was obtained in all Mg/p molar ratios. Thus, it is expected that magnesium hydroxide and magnesium oxide are able to replace magnesium chloride as a magnesium source in terms of phosphorus recovery efficiency and cost.
Keywords
Centrate; Magnesium ammonium phosphate (MAP); Magnesium chloride; Magnesium hydroxide; Magnesium oxide; Phosphate;
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Times Cited By KSCI : 2  (Citation Analysis)
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