Effect of magnesium dose on amount of pharmaceuticals in struvite recovered from urine
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Author list: Kemacheevakul P., Chuangchote S., Otani S., Matsuda T., Shimizu Y.
Publisher: IWA Publishing
Publication year: 2015
Journal: Water Science & Technology (0273-1223)
Volume number: 72
Issue number: 7
Start page: 1102
End page: 1110
Number of pages: 9
ISSN: 0273-1223
eISSN: 1996-9732
Languages: English-Great Britain (EN-GB)
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Abstract
Phosphorus (P) recovery was carried out through struvite precipitation from urines. Human urine, however, contains not only high nutrients for plants, such as P and nitrogen, but also pharmaceuticals and hormones. In this work, effects of magnesium (Mg) dose (in terms of Mg:P ratio) on P recovery efficiency and pharmaceutical amounts contained in struvite were investigated. Batchscale experiments of synthetic and human urines revealed that struvite precipitation formed more X-shaped crystals with an increased molar ratio of Mg:P, while the amount of pharmaceuticals (tetracycline, demeclocycline, and oxytetracycline) in struvite decreased with an increased molar ratio of Mg:P. The lowest pharmaceutical amounts in struvite were found at the Mg:P ratio of 2:1 from both samples. Moreover, the maximum P recovery efficiency, quantity and purity of struvite were found in the range of 1.21 to 2:1. It indicated that the molar ratio of Mg:P has a significant impact on struvite precipitation in terms of pharmaceutical amounts in struvite; morphology, quantity and purity of struvite; and P recovery. ฉ 2015 IWA Publishing.
Keywords
Magnesium molar ratio, phosphorus recovery
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