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Recovery of N and P Resources from Animal Wastewater by Struvite Crystallization

Struvite 결정화에 의한 축산폐수로 부터 질소.인 자원의 재생

  • Jo, W.S. (Division of Animal Resource Science, Kangwon National University) ;
  • Yoon, S.J. (Division of Animal Resource Science, Kangwon National University) ;
  • Ra, C.S. (Division of Animal Resource Science, Kangwon National University)
  • 조원실 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 윤성준 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 라창식 (강원대학교 동물자원과학대학 동물자원학부)
  • Published : 2003.10.31

Abstract

Operational parameters for struvite crystallization, as a process to recover nitrogen and phosphorus resources from animal wastewater, were studied in this research. Crystallization distinctive of NH$_4$-N and PO$_4$$^{3-}$ in accordance to chemical sources, influent pH, aeration and stirring was examined using 2L of working volume of struvite reactor. Also, to find an effective treatment process combining with electrolysis method, removal characteristics of NH$_4$-N and PO$_4$$^{3-}$ in 6 different processes was tested. As chemical sources for the derivation of struvite formation, MgSO$_4$ and MgCl$_2$ were superior to CaCO$_3$ and CaCl$_2$. From experiment which was conducted to know the effects of aeration and stirring on struvite formation, it was revealed that aeration stimulated the crystallization reaction by inducing faster pH increase. While 90% of P removal was achieved within 1 hour under aeration, 14 hours was consumed under stirring condition. Struvite formation under aeration was affected by influent pH. No crystallization was observed at pH 5 level, but active crystallization reaction was induced over pH 6.0. 95% of P removal by struvite formation at pH 6, 7 and 9 was achieved within 3h, 2h and 10 min., respectively. However, over pH 10, operational problem due to excessive foam formation occurred, and blunting of crystallization reaction was observed at pH 11. When consider the pH range of animal wastewater, pH 7 to 9, efficient struvite formation could be achieved by simple aeration, without any chemical usage for pH adjustment. Among tested processes, the treatment process which electrolyzing the supernatant from struvite reactor, providing air to both reactors, showed best pollutant removal efficiencies. In this combined process, the removal efficiencies of NH$_4$-N and PO$_4$$^{3-}$ was 86% and 98%, respectively, and 92.4% of color removal was obtained.

Keywords

Struvite;Crystallization;Electrolysis;Swine wastewater

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