Abstract:
:Surface transfer and bubble transfer both contribute significantly to oxygen transfer in a diffused aeration system. In the present study, liquid-film-forming apparatus is successfully developed on a laboratory scale to improve considerably the surface transfer via the unique liquid film transfer technique. The experimental results show that the volumetric mass transfer coefficient for liquid-film-forming apparatus alone is found to be as much as 5.3 times higher than that for water surface and that the total volumetric mass transfer coefficient for liquid film aeration system increases by 37 % in comparison with conventional aeration system. Additionally, by tuning finely the structural parameters of the liquid-film-forming apparatus, it can also lead to high dissolved oxygen water with the dissolved oxygen percent saturation greater than 90 %. More importantly, this result is accomplished by simply offering a single-pass aeration at the depth as shallow as 26 cm. As a result, the objective of economical energy consumption in diffused aeration systems can be realized by lowering the aeration depth without sacrificing the aeration efficiency.
journal_name
Environ Technoljournal_title
Environmental technologyauthors
Zhu H,Imai T,Tani K,Ukita M,Sekine M,Higuchi T,Zhang ZJdoi
10.1080/09593332808618813subject
Has Abstractpub_date
2007-05-01 00:00:00pages
511-9issue
5eissn
0959-3330issn
1479-487Xjournal_volume
28pub_type
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