The Effect of Mixing Chamber Configuration and Submersion Depth on Centrifugal Aerator Performance

Zhen Zhang (), Yuan Zheng, Xiwang Xu and Bin Peng
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Zhen Zhang: College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
Yuan Zheng: College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
Xiwang Xu: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Bin Peng: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

Sustainability, 2022, vol. 14, issue 18, 1-20

Abstract: Centrifugal aerators are a vital piece of equipment in water treatment. To improve the efficiency and economy of their operation, a study of their mixing chamber structure and submergence depth was carried out using a combination of numerical simulations and experiments. A centrifugal aerator dissolved oxygen (DO) test bench was built and the numerical simulation was compared with the experiment, the inlet air flow rate showing only a 2.23% error, which verifies the reliability of the numerical simulation. The results show that the capacity of oxygen dissolved in the aeration tank increases and then decreases as the relative area ratio ( ð ) of the mixing chamber increases, reaching the best capacity at ð = 8.38. In the case of different submergence coefficients ( β ), the gas volume fraction increased by 31.29% on average at β = 0.15; the standard oxygen transfer rate (SOTR) increased and then decreased with the increase of β , with an average increase of 56.6%. Moreover, the oxygenation performance of centrifugal aerators was significantly improved by the reasonable submergence depth and the structure of the mixing chamber.

Keywords: centrifugal aerator; water treatment; submergence depth; numerical simulations; volume fraction (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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