The effect of operational conditions on the performance of UASB reactors for domestic wastewater treatment

In this investigation, the performance of Upflow Anaerobic Sludge Blanket (UASB) reactors treating municipal wastewater was evaluated on the basis of: (i) COD removal efficiency, (ii) effluent variability, and (iii) pH stability. The experiments were performed using 8 pilot-scale UASB reactors (120...

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Bibliographic Details
Published in:Water Science & Technology 2005-01, Vol.52 (1-2), p.299-305
Main Authors: Leitão, R C, Silva-Filho, J A, Sanders, W, van Haandel, A C, Zeeman, G, Lettinga, G
Format: Article
Language:English
Subjects:
Anaerobic treatment
Bacteria, Anaerobic - metabolism
Bioreactors - microbiology
Brazil
Domestic wastewater
Effluents
Evaluation Studies as Topic
Hydraulic retention time
Influents
Methane - metabolism
Municipal wastewater
Ozone
Reactors
Removal
Retention time
Sewage
Sewage - microbiology
Sludge
Stability
Time Factors
Upflow anaerobic sludge blanket reactors
Variability
Waste Disposal, Fluid - methods
Waste treatment
Wastewater
Wastewater treatment
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Summary:In this investigation, the performance of Upflow Anaerobic Sludge Blanket (UASB) reactors treating municipal wastewater was evaluated on the basis of: (i) COD removal efficiency, (ii) effluent variability, and (iii) pH stability. The experiments were performed using 8 pilot-scale UASB reactors (120 L) from which some of them were operated with different influent COD (CODInf ranging from 92 to 816 mg/L) and some at different hydraulic retention time (HRT ranging from 1 to 6 h). The results show that decreasing the CODInf, or lowering the HRT, leads to decreased efficiencies and increased effluent variability. During this experiment, the reactors could treat efficiently sewage with concentration as low as 200 mg COD/L. They could also be operated satisfactorily at an HRT as low as 2 hours, without problems of operational stability. The maximum COD removal efficiency can be achieved at CODInf exceeding 300 mg/L and HRT of 6h.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2005.0531