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The effect of influent COD and upward flow velocity on the behaviour of sulphate-reducing bacteria

Paper ID Volume ID Publish Year Pages File Format Full-Text
36531 45136 2005 6 PDF Available
Title
The effect of influent COD and upward flow velocity on the behaviour of sulphate-reducing bacteria
Abstract

The effect of up velocity and influent COD concentration on the activity of sulphate-reducing bacteria (SRB) in UASB reactors is discussed. To study these effects, four UASB reactors were built and utilized in parallel. Examinations were carried out in two different concentrations of molasses (500 mg COD/l and 1000 mg COD/l) and four different upward flow velocities. It was observed that at velocities greater than 1 m/h, SRB bacteria were easily washed out from the reactors due to lower density and lack of ability to form dense and firm granules. It was found that in low-strength wastewaters with a COD to sulphate ratio of 2, an upward velocity in the range of 1.5–2.5 m/h could be appropriate. At lower velocities, there would be significant numbers of SRB bacteria and so a toxicity risk to the system. At higher velocities, the COD removal efficiency may decrease due to lower hydraulic retention time in the system. It was also observed that increasing COD concentration improves COD removal efficiencies but has little effect on washing out of SRB.

Keywords
Sulphate-reducing bacteria; Methane-producing bacteria; SRB; MPB; UASB reactors; Upflow velocity; Hydraulic retention time; Methanogenesis
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The effect of influent COD and upward flow velocity on the behaviour of sulphate-reducing bacteria
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 7, June 2005, Pages 2305–2310
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us