This work assessed the energy potential and alternative usages of biogas and sludge generated in upflow anaerobic sludge blanket reactors at the Laboreaux sewage treatment plant (STP), Brazil. Two scenarios were considered: (i) priority use of biogas for the thermal drying of dehydrated sludge and the use of the excess biogas for electricity generation in an ICE (internal combustion engine); and (ii) priority use of biogas for electricity generation and the use of the heat of the engine exhaust gases for the thermal drying of the sludge. Scenario 1 showed that the electricity generated is able to supply 22.2% of the STP power demand, but the thermal drying process enables a greater reduction or even elimination of the final volume of sludge to be disposed. In Scenario 2, the electricity generated is able to supply 57.6% of the STP power demand; however, the heat in the exhaust gases is not enough to dry the total amount of dehydrated sludge.
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Research Article|
December 29 2015
Energy potential and alternative usages of biogas and sludge from UASB reactors: case study of the Laboreaux wastewater treatment plant
A. P. Rosa;
A. P. Rosa
1Departamento de Química, Universidade Federal de Viçosa, Av. Peter Henry Rolfs s/n, Campus Universitário, Viçosa MG 36570-000, Brazil E-mail: [email protected]; [email protected]
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J. A. Conesa;
J. A. Conesa
2Chemical Engineering Department, University of Alicante, PO Box 99, Alicante 03080, Spain
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A. Fullana;
A. Fullana
2Chemical Engineering Department, University of Alicante, PO Box 99, Alicante 03080, Spain
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G. C. B. Melo;
G. C. B. Melo
3Departamento de Engenharia Sanitária e Ambiental, Escola de Engenharia, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6.627-Campus Pampulha, Belo Horizonte, MG 31270-901, Brazil
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J. M. Borges;
J. M. Borges
4Serviço Autônomo de Água e Esgoto (SAAE), R. Nossa Sra. do Carmo, 148, Itabira, MG 35900-046, Brazil
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C. A. L. Chernicharo
C. A. L. Chernicharo
3Departamento de Engenharia Sanitária e Ambiental, Escola de Engenharia, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6.627-Campus Pampulha, Belo Horizonte, MG 31270-901, Brazil
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Water Sci Technol (2016) 73 (7): 1680–1690.
Article history
Received:
July 27 2015
Accepted:
December 08 2015
Citation
A. P. Rosa, J. A. Conesa, A. Fullana, G. C. B. Melo, J. M. Borges, C. A. L. Chernicharo; Energy potential and alternative usages of biogas and sludge from UASB reactors: case study of the Laboreaux wastewater treatment plant. Water Sci Technol 7 April 2016; 73 (7): 1680–1690. doi: https://doi.org/10.2166/wst.2015.643
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