| Title |
Nitrogen and Phosphorus Recoveries from Anaerobic Digester Supernatant Using Seawater as Magnesium Source for Struvite Formation |
| Authors |
김용범 ( Yong Beon Kim ) ; 안종화 ( Johng Hwa Ahn ) |
| DOI |
https://doi.org/10.15681/KSWE.2015.31.4.387 |
| Keywords |
Anaerobic digester supernatant; Nitrogen recovery; Phosphorus recovery; Seawater; Struvite crystallization |
| Abstract |
This study was performed to evaluate the effect of pH (8-12) and molar ratio of magnesium and phosphate ([Mg2+]/[PO43-]) (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 [Mg2+]/[PO43-] of 1.0 and pH 10. On the other hand, high phosphate recovery efficiency (> 99%) was achieved at ([Mg2+]/[PO43-]) 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. |