Klebsiella pneumoniae에 의한 NO3-N의 호기성 탈질에 관한 연구

Abstract

The aim of this research is to investigate the effects of several factors on the removal of NO₃-N under aerobic condition by Klebsiella pneumoniae. In the synthetic wastewater initially containing 350 mg/ℓ of NO₃-N. NO₃-N were completely consumed at C/N ratios of 5, 10, 20 and 34.3, but at C/N 2.5, the consumption of NO₃-N stopped at 207 mg/ℓ. For the complete removal of NO₃-N and complete consumption of glucose, the optimal C/N was 5. Therefore, the addition of external carbon is necessary in the wastewater treatment of NO₃-N at C/N less than 5. The effect of shaking and standing cultures on NO₃-N removal also investigated. NO₃-N was removed complete after 24 hours on the shanking culture. NO₃-N was removed complete attained in after 24 hours on the shaking culture. Similarly the NO₃-N was slowly removed on the standing culture. By taking the nitrogen balance after cultivation of 24 hours, about 82.5% of removed T-N was denitrified and 7.6% of removed T-N was converted to the intracellular nitrogen.