The influence of sludge discharge frequency on the performance of a full-scale UASB-type reactor has been assessed. The reactor has eight compartments and treats domestic sewage with an 8 hour hydraulic retention time. In each compartment, a different discharge frequency was employed ranging from 1 to 8 months. During the assessment period, the chemical oxygen demand (COD) removal efficiency, effluent volatile suspended solids (VSS) concentration, and cellular yield coefficient (Y) were evaluated. The results indicated that the operational stability increased with increasing discharge frequency, as shown by a higher COD removal and lower effluent VSS. The values of Y decreased when the sludge discharge frequency increased. In practice, good performance can be achieved when the sludge discharge frequency is between 1 and 4 months; COD removal efficiencies of 60–80%, average VSS effluent concentrations of 25–80 mg L−1, and Y values of 0.10–0.18 kg VSS kg CODremoved−1 were obtained.
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Research Article|
June 01 2015
The influence of excess sludge discharge on the performance of a full-scale UASB reactor
K. K. Barros;
K. K. Barros
a
Laboratory of Environmental Engineering, Academic Center of Agreste
, Federal University of Pernambuco
, Rodovia BR-104, Km 62, Nova Caruaru. Caruaru, Pernambuco CEP: 55002-970
, Brazil
b
Laboratory of Environmental Sanitation, Department of Civil Engineering
, Federal University of Pernambuco
, Av. Acadêmico Hélio Ramos, s/n. Cidade Universitária, Recife, Pernambuco CEP: 50740-530
, Brazil
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S. Gavazza;
S. Gavazza
a
Laboratory of Environmental Engineering, Academic Center of Agreste
, Federal University of Pernambuco
, Rodovia BR-104, Km 62, Nova Caruaru. Caruaru, Pernambuco CEP: 55002-970
, Brazil
*Corresponding author. E-mail: [email protected]
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L. Florencio;
L. Florencio
b
Laboratory of Environmental Sanitation, Department of Civil Engineering
, Federal University of Pernambuco
, Av. Acadêmico Hélio Ramos, s/n. Cidade Universitária, Recife, Pernambuco CEP: 50740-530
, Brazil
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M. T. Kato
M. T. Kato
b
Laboratory of Environmental Sanitation, Department of Civil Engineering
, Federal University of Pernambuco
, Av. Acadêmico Hélio Ramos, s/n. Cidade Universitária, Recife, Pernambuco CEP: 50740-530
, Brazil
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Water Practice and Technology (2015) 10 (2): 250–258.
Citation
K. K. Barros, S. Gavazza, L. Florencio, M. T. Kato; The influence of excess sludge discharge on the performance of a full-scale UASB reactor. Water Practice and Technology 1 June 2015; 10 (2): 250–258. doi: https://doi.org/10.2166/wpt.2015.027
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