Abstract—In this paper, a lab-scale aerated vessel equipped with a surface aeration impeller was developed to examine standard aeration efficiency (SAE) and mixing time. The SAE and mixing specifications were investigated via variations in the operating parameters, such as rotor speed, impeller immersion depth and water height. Surface aeration was performed using a Rushton disk turbine. Results showed that variation of impeller immersion depth has a greater effect on SAE compare to changes in water level. Moreover, SAE increases with rotor speed up to about 150 to 200 rpm and then decrease. In addition, mixing time is reduced with increase in rotor speed. According to the Response surface methodology (RSM) statistical optimization, optimum values of 169 rpm, 25 mm and 30 cm were found for rotor speed, impeller immersion depth and water height respectively in the range of this study to achieve the maximum value of SAE.
Index Terms—Mixing time, optimization, response surface methodology, standard aeration efficiency, surface aeration.
A. Mohammadpour, M. A. Akhvan-Behabadi, and M. Ebrahimzadeh are with the School of Mechanical Engineering, University of Tehran, Tehran, Iran (e-mail: mohamadpr@ut.ac.ir, akhavan@ut.ac.ir, M.ebrahimzadeh@ut.ac.ir).
M. Nosrati is with the Chemical Engineering Department, Biotechnology Group, Tarbiat Modares University, Tehran, Iran (corresponding author; e-mail: mnosrati20@modares.ac.ir).
A. R. MajdiNasab is with the Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran (e-mail: ali.majd43@yahoo.com).
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Cite: A. Mohammadpour, M. A. Akhvan-Behabadi, M. Nosrati, M. Ebrahimzadeh, and A. R. Majdinasab, "Evaluation and Optimization of Efficiency and Mixing Time in a Surface Aeration Tank," International Journal of Chemical Engineering and Applications vol. 6, no. 3, pp. 160-164, 2015.
