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DOI : ,    Vol.19, No.5, 11 ~ 23, 2011
Title
Comparative Study of Oxygen Transfer Efficiency Between Micro-nano Bubble- and Conventional Bubble-Diffuser Systems
한영립 Young Rip Han , 최영익 Young Ik Choi , 윤태경 Tae Kyung Yoon , 이강춘 Gang Choon Lee , 정병길 Byung Gil Jung
Abstract
The main objective of this study was to evaluate the comparative analysis of oxygen transfer efficiencies between MNB(Micro-nano bubble) and CB(conventional bubble) diffuser systems for application of wastewater treatment processes such as flotation, aeration, water reclamation and so on. The bubble size of the MNB diffuser system was shown to be below 0.5 ㎛, and a proper air flowrate was 1.0 L/min. When the proposed MNB system compared with the CB diffuser system, the overall oxygen transfer coefficient (KLa), standard oxygen transfer rate (N) and volumetric oxygen transfer rate (VOTR) values were 11.67 (13.18), 11.80 (13.08) and 3.23 (13.14) times higher for influent (effluent) dyeing wastewater in the same initial conditions at air flow rate (1.0 L/min) under standard conditions (20℃, 1 atm), respectively. Therefore, the MNB diffuser system is expected to be much better effective technology on water and wastewater treatment processes.
Key Words
Micro-nano bubble, Conventional bubble, Overall oxygen transfer coefficient, KLa, Standard oxygen transfer rate, N, Volumetric oxygen transfer rate, VOTR
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