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Dominance of yeast in activated sludge under acidic pH and high organic loading

Paper ID Volume ID Publish Year Pages File Format Full-Text
3901 197 2010 7 PDF Available
Title
Dominance of yeast in activated sludge under acidic pH and high organic loading
Abstract

Flow cytometry-fluorescent in situ hybridization (FC-FISH) was used to investigate the effect of controlled pH and/or varied organic loading on the content of yeast and bacterial cells in an activated sludge system (AS) individually operating in continuous and batch mode for treatment of high-strength industrial wastewater. Specifically, we attempted to develop a yeast-predominant activated sludge system (Y-AS). For the batch-mode AS, bacteria-dominated AS (B-AS) obtained at pH 6.5–7.5 induced higher chemical oxygen demand (COD) removal than Y-AS obtained at acidic pH (5.0–6.0 and 4.0–5.0). For the continuous-mode AS operating at COD loadings of 2.5–2.8 kg COD m−3 d−1, it was difficult to achieve a Y-AS solely by controlling the pH level at 7.0 to 5.1 then to 4.1 because bacteria stably accounted for greater than 98% of the total cells, regardless of the pH levels. Therefore, the effects of varied COD loadings (2.1, 8.7 and 21.0 kg COD m−3 d−1) on continuous-mode AS operation at acidic pH (4.5) was investigated. Both acidic pH and high COD loading levels were found to be prerequisites for yeast to dominate the sludge microbial community in the continuous-mode AS.

Keywords
Microbial dynamics; Activated sludge; Flow cytometry-fluorescent in situ hybridization; Yeast; pH; Organic loading
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Dominance of yeast in activated sludge under acidic pH and high organic loading
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 52, Issues 2–3, 15 November 2010, Pages 282–288
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