The effect of operational conditions on the sludge specific methanogenic activity and sludge biodegradability

The effects of hydraulic retention time (HRT) and influent COD concentration (CODInf) on Specific Methanogenic Activity (SMA) and the biodegradability of an anaerobic sludge need to be elucidated because of the discordant results available in literature. This information is important for the operati...

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Bibliographic Details
Published in:Water science and technology 2009-01, Vol.59 (9), p.1847-1853
Main Authors: Leitão, R C, Santaellla, S T, van Haandel, A C, Zeeman, G, Lettinga, G
Format: Article
Language:English
Subjects:
anaerobic-digestion
Biodegradability
Biodegradation
Bioreactors - microbiology
Hydraulic retention time
Methane - metabolism
Municipal wastewater
Reactors
Retention time
sewage
Shape memory alloys
Shock loads
Sludge
uasb-reactor
Upflow anaerobic sludge blanket reactors
Waste Disposal, Fluid - methods
Wastewater
water
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Summary:The effects of hydraulic retention time (HRT) and influent COD concentration (CODInf) on Specific Methanogenic Activity (SMA) and the biodegradability of an anaerobic sludge need to be elucidated because of the discordant results available in literature. This information is important for the operation of anaerobic reactors and design of the sludge post-treatment unit. For this study, sludge samples obtained from eight pilot-scale Upflow Anaerobic Sludge Blanket (UASB) reactors were tested. The reactors were fed with municipal wastewater and operated with different sets of HRT and influent concentrations until the steady state was established. The results show that at a lower HRT, sludge with relatively higher SMA develops. A slight trend of declining SMA at increasing CODInf was found for reactors operated at longer HRTs; however, further experiments are necessary for more definitive conclusions. The sludge from reactors operated at longer HRTs and with lower CODInf resulted in lower biodegradability. Results also showed that it is ineffective to design a UASB reactor with a longer HRT to cope with organic shock loads.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2009.188