Evaluation of UASB reactor performance during start-up operation using synthetic mixed-acid waste

A start-up experiment was performed in a laboratory-scale, upflow anaerobic sludge blanket (UASB) reactor using seed sludge from a domestic waste treatment plant at 3.8–33.3 gCOD l −1 day −1 loading rates. Analysis over the height of the reactor with time showed that the VSS in the reactor was initi...

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Bibliographic Details
Published in:Bioresource technology 2008-11, Vol.99 (17), p.8231-8236
Main Authors: Vadlani, P.V., Ramachandran, K.B.
Format: Article
Language:English
Subjects:
Acetic Acid - metabolism
Active biomass
Applied sciences
Biological and medical sciences
Bioreactors
Bioreactors - standards
Biotechnology
Butyric Acid - metabolism
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
Oxygen - chemistry
Pollution
Seed sludge
Sewage - chemistry
Start-up
Time Factors
UASB
Various methods and equipments
Volatilization
Waste Products
Wastes
Wastewater treatment
Wastewaters
Water treatment and pollution
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Summary:A start-up experiment was performed in a laboratory-scale, upflow anaerobic sludge blanket (UASB) reactor using seed sludge from a domestic waste treatment plant at 3.8–33.3 gCOD l −1 day −1 loading rates. Analysis over the height of the reactor with time showed that the VSS in the reactor was initially differentiated into active and non-active biomass at increasing gas production and upflow velocities, and specific update rates of the volatile fatty acids (VFA) components were pronounced at the bottom 10% of the reactor. During start-up, specific methanogenic activity and chemical oxygen demand (COD) uptake rate increased from 0.075 to 0.75 gCOD–CH 4 (gVSS) −1 day −1 and from 0.08 to 0.875 gCOD removed (gVSS) −1 day −1, respectively. When seed sludge from a distillery waste treatment plant was used, improved performance due to a predominance of active biomass was evident when the loading rate was increased from 9.4 to 28.7 gCOD l −1 day −1. The proposed start-up evaluation is an effective tool to successfully monitor performance of UASB reactors.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2008.03.011