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http://dx.doi.org/10.15681/KSWE.2015.31.4.387

Nitrogen and Phosphorus Recoveries from Anaerobic Digester Supernatant Using Seawater as Magnesium Source for Struvite Formation  

Kim, Yong-Beom (Department of Environmental Engineering, College of Engineering, Kangwon National University)
Ahn, Johng-Hwa (Department of Environmental Engineering, College of Engineering, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.31, no.4, 2015 , pp. 387-391 More about this Journal
Abstract
This study was performed to evaluate the effect of pH (8-12) and molar ratio of magnesium and phosphate ($[Mg^{2+}]/[PO_4{^{3-}}]$) (0.6-1.4) on struvite crystallization of anaerobic digester supernatant using seawater as magnesium source. pH range of 9-10 is favorable for ammonium and phosphate recoveries. The recovery efficiency of ammonium was highest at $[Mg^{2+}]/[PO_4{^{3-}}]$ of 1.0 and pH 10. On the other hand, high phosphate recovery efficiency (> 99%) was achieved at ($[Mg^{2+}]/[PO_4{^{3-}}]$) of 1.4 and pH 10. The results demonstrated that seawater can be considered as low-cost magnesium source to recover phosphorus from anaerobic digester supernatant.
Keywords
Anaerobic digester supernatant; Nitrogen recovery; Phosphorus recovery; Seawater; Struvite crystallization;
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Times Cited By KSCI : 1  (Citation Analysis)
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