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이온선택성 미소전극을 이용한 질산화 생물막내의 질소 이온의 농도 모니터링
선지윤(Jiyun Seon),변임규(Imgyu Byun),이태호(Taeho Lee),박태주(Taejoo Park) 한국생물공학회 2010 KSBB Journal Vol.25 No.1
An ion selective microelectrode (ISME) was fabricated to measure concentrations of ammonium (NH4+-N) and nitrate (NO3--N) according to the depth of nitrifying biofilm. The limits of detectability and validity of results were investigated to evaluate the ISME. The electromotive force (EMF) was directly proportional to the ion concentration, and average detection limits of NH4+ and NO3- ISME were 10<SUP>-5.14</SUP> and 10<SUP>-5.18</SUP> M, respectively. The concentrations of NH4+-N and NO3--N in various depths on the nitrifying biofilm were measured by the ISME. When a modified Ludzack-Ettinger (MLE) process was operated at an HRT of 6 h, concentration gradients of NH4+-N in the bulk solution and biofilm at depths of 100 μm decreased by 70 μM, while NO3--N increased by 101 μM and remained constant thereafter. At an HRT of 4 h, concentration gradients of NH4+-N at depths of 500 μm decreased by 160 μM and NO3--N increased by 162 μM and remained constant thereafter. As HRT decreased, the concentration gradients of NH4+-N and NO3--N between bulk solution and biofilm was higher due to the increase of nitrogen load. Also, the concentration gradients of the NH4+-N and NO3--N of biofilm in the second aerobic tank were lower than those of the first aerobic tank, suggesting differences of nitrogen load and concentrations of DO between the first and second aerobic tank.