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논문 기본 정보

자료유형
학술저널
저자정보
Narapong Hongprasith (Chulalongkorn University) Natchanok Dolkittikul (Chulalongkorn University) Kamolnapach Apiboonsuwan (Chulalongkorn University) Wiboonluk Pungrasmi (Chulalongkorn University) Pisut Painmanakul (Chulalongkorn University)
저널정보
대한환경공학회 Environmental Engineering Research Environmental Engineering Research 제21권 제3호
발행연도
2016.9
수록면
233 - 240 (8page)

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초록· 키워드

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The research aims to study the different flexible rubber tube diffusers used in urban wastewater treatment processes and aquaculture systems. The experiment was conducted in small-scale aeration tank with different physical properties of the tubes that were used as aerators. The volumetric mass transfer coefficient (kLa), oxygen transfer efficiency (OTE) and aeration efficiency (AE) were measured and determined to compare the diffusers. Moreover, the bubble hydrodynamic parameters were analyzed in terms of bubble diameter (dB) and rising velocity (UB) by a high speed camera (2,000 frames/s). Then the interfacial area (a) and liquid-side mass transfer coefficient (kL) can be calculated. The physical properties (tube wall thickness, tensile strength, orifice size, hardness and elongation) have been proven to be the key factor that controls the performance (kLa and OTE). The effects of hardness and elongation on bubble formation, orifice size and a-area were clearly proved. It is not necessary to generate too much fine bubbles to increase the a-area: this relates to high power consumption and the decrease of the kL. Finally, the wall thickness, elongation and hardness associated of the flexible tube diffuser (tube No. 12) were concluded, to be the suitable properties for practically producing, in this research.

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ABSTRACT
1. Introduction
2. Materials and Methods
3. Mass Transfer Coefficients and Bubble Hydrodynamic Parameters
5. Results and Discussion
6. Conclusions
References

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