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

바닷물을 이용한 struvite 형성으로 혐기성 소화액으로부터 질소, 인 회수

Kim, Yong-Beom;Ahn, Johng-Hwa

  • Received : 2015.04.03
  • Accepted : 2015.07.14
  • Published : 2015.07.31


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.


Anaerobic digester supernatant;Nitrogen recovery;Phosphorus recovery;Seawater;Struvite crystallization


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