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Chemical/Electro-Chemical Method for Swine Wastewater Treatment

화학적/전기화학적 방법을 이용한 돈사폐수 처리

  • Yoon, S.J. (Division of Animal Resource Seience, Kangwon National University) ;
  • Jo, W.S. (Division of Animal Resource Seience, Kangwon National University) ;
  • Kim, C.H. (Division of Animal Resource Seience, Kangwon National University) ;
  • Park, J.I. (Division of Animal Resource Seience, Kangwon National University) ;
  • Shin, J.S. (Division of Animal Resource Seience, Kangwon National University) ;
  • Ra, C.S. (Division of Animal Resource Seience, Kangwon National University)
  • 윤성준 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 조원실 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 김창혁 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 박재인 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 신종서 (강원대학교 동물자원과학대학 동물자원학부) ;
  • 라창식 (강원대학교 동물자원과학대학 동물자원학부)
  • Published : 2003.08.30

Abstract

In a batch mode treatment process, which electrolyzes the wastewater after derivation of N-P crystal formation and recovery, the characteristics of pollutant removal induced with the changes of loading rate and hydraulic retention time were studied. $MgCl_2$ was used as Mg source for the formation of struvite and the molar ratio of $MgCl_2$ to $PO_4^{3-}$ in influent was 1.3. When analyzing the average treatment efficiencies and removal characteristics obtained from four separate operations (Run I, II, III, IV), removal efficiencies of PO43- was not function of its loading rate. Under a condition of sufficient aeration and Mg source provided, over 88% of $PO_4^{3-}$ was eliminated by the formation of MAP without any pH adjustment, in spite of loading rate variation. An optimum-loading rate of NH4-N to achieve high removal efficiency was approximately $100g/m^3/d$. Below that loading rate, the removal of NH4-N was proportional to the loading rate into the system, and hence stable and high removal efficiency, over 90%, was achieved. However, when the loading rate increased over that rate, removal efficiency began to drop and fluctuate. Removal efficiency of TOCs was dependant upon the hydraulic retention time ($r^2$=0.97), not upon the loading rate. Stable and high color removal (94%) was obtained with 2 days of HRT in electrolysis reactor.

Keywords

Color removal;Electrolysis;Loading rate;Struvite;Swine wastewater

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