Effects of Operating Pressure on Granular Sludge Flotation Mechanism Inside an Anaerobic Upflow Reactor
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Author list: Ruttithiwapanich T., Pridasawas W., Ruenglertpanyakul W., Songkasiri W.
Publisher: American Society of Civil Engineers
Publication year: 2018
Journal: Journal of Environmental Engineering (0733-9372)
Volume number: 144
Issue number: 12
ISSN: 0733-9372
eISSN: 1943-7870
Languages: English-Great Britain (EN-GB)
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Abstract
This research utilized computational fluid dynamic simulations to evaluate the effect of the headspace pressure on the granular sludge flotation, using an operating anaerobic upflow reactor (AUR) at a cassava starch factory as the model reactor. Increasing the headspace pressure from 0 to 56.68 kPa significantly reduced the average sludge volume fraction from 0.5424 to 0.4903 at a reactor height of 1 m (α=0.05). In addition, the liquid axial momentum was transformed to a radial form, the average liquid upflow velocity was significantly reduced from 0.0017 to 0.0011 m/s at a reactor height between 2 and 6 m, and the average liquid radial flow velocity increased from 0.0062 s to 0.0068 m/s at a reactor height between 0 and 4 m (α=0.05). An AUR with a low head pressure and a low liquid level encouraged granular sludge flotation. © 2018 American Society of Civil Engineers.
Keywords
Granular sludge, Mixing, Start-up, Three-phase simulation
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