Struvite Crystallization of Anaerobic Digestive Fluid of Swine Manure Containing Highly Concentrated Nitrogen

  • Lee, Eun Young (Department of Environmental Engineering, The University of Suwon) ;
  • Oh, Min Hwan (Department of Environmental Engineering, The University of Suwon) ;
  • Yang, Seung-Hak (Animal Environment Division, National Institute of animal Science, RDA) ;
  • Yoon, Tae Han (Dodram Environment Research Center Co. Ltd.)
  • Received : 2014.09.02
  • Accepted : 2014.10.25
  • Published : 2015.07.01


In this study, the optimal operation factors for struvite crystallization for removing and recovering nitrogen and phosphorus from anaerobic digestive fluid of swine manure containing highly concentrated nitrogen was determined. Every experiment for the struvite crystallization reaction was conducted by placing 1,000 mL of digestion fluid in a 2,000 mL Erlenmeyer flask at various temperatures, pH, and mixing speed. Except for special circumstances, the digestion fluid was centrifuged (10,000 rpm, 10 min) and then the supernatant was used for the experiment at room temperature and 100 rpm. The optimal mole ratio of $PO_4{^{3-}}:Mg^{2+}$ was 1:1.5, and the pH effect ranging from 9 to 11 was similar, when mixed for 1 hour. Under this condition, the removal efficiency of $NH_4{^+}-N$ and $PO_4{^{3-}}-P$ was 40% and 88.6%, respectively. X-shaped crystal was observed by light and scanning electron microscopy. In addition, struvite crystal structure was confirmed through X-ray diffraction analysis.


Supported by : Ministry of Environment


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