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Proton Effect on the Degradation of Phenolic Compound by Activated Sludge and Nocardia asteroides

활성슬러지 혼합미생물과 Nocardia asteroides에 의한 페놀화합물 분해시 양성자이온의 영향

  • 조관형 (청운대학교 토목환경공학과) ;
  • 조영태 (충청대학 환경화공학부) ;
  • 우달식 (한국계면공학연구소)
  • Published : 2002.06.01

Abstract

This study was investigated to evaluate the effect of the sodium ion and pH on toxicity of dinitrophenol at high concentrations (0.41 to 0.54 mM), over a sodium concentration range of 0.1 mM to 107 mM and over a pH range of 5 to 9. The concentration of sodium ions in the activated sludge mixed liquor seemed to have very little effect on dinitrophenol toxicity. However, lack of sodium in the growth media resulted in a reduction of the dinitrophenol degradation rate by bacterial isolate from the activated sludge culture, which has been identified as Nocardia asteroides. Dinitrophenol inhibition was found to be strongly dependent on mixed liquor pH. The dinitrophenol degradation rate was highest in the pH range of 6.95 to 7.84; at pH 5.94 degradation of 75 mg/L dinitrophenol was significantly inhibited; at pH < 5.77, dinitrophenol degradation was completely inhibited after approximately 30% of the dinitrophenol was degraded.

Keywords

Acclimation;Inhibition;Nitrophenol;pH;Sodium ion

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