Biological treatment of municipal wastewater with deep tanks and flotation for secondary clarification

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.

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Dissolved Air Flotation

Wang

Fahey²,

2005

Physicochemical Treatment Processes

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Biological treatment of municipal wastewater with deep tanks and flotation for secondary clarification

Cited by 3 publications

References 3 publications

Activated Sludge Clarification Using an Advanced DAF Process Based on the Down-Flow Floating Cover Filtration

Activated Sludge Clarification Using an Advanced DAF Process Based on the Down-Flow Floating Cover Filtration

Enhancement of Oxygen Transfer Efficiency in Diffused Aeration Systems using Liquid-Film-Forming Apparatus

Dissolved Air Flotation

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