Abstract
Spiral liquid circulation rate in the conventional aeration tank was investigated based upon the theoretical development of the hydrodynamics and the experimental observation. The effect of liquid circulation rate on the gas-liquid oxygen transfer and the oxygen exchange between the bubbling zone and the bubble-free zone in the aeration tank were clarified. The spiral liquid circulation rate at the liquid surface in the aeration tank was correlated as functions of the superficial gas feed rate, the diffuser depth and the bubble diameter generated from the air diffusers. The oxygen exchange resistance between the bubbling zone and the bubble-free zone was 3 - 5 % compared to the overall oxygen transfer resistance from the atmosphere to the bubble-free zone, while that in the deep aeration tank was significant. It was also clarified that the higher spiral liquid circulation rate increases the bubble ascending velocity and thus hinders the gas-liquid oxygen transfer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
