Paper details

Title:

Biogas Production from Vinasse: Effects of Byproducts from Livestock and Sugar-Beet Production as Co-Substrates

Author(s):

Moraes, B.S., Triolo, J.M., Lecona, V.P., Sommer, S.G., Zaiat, M.

Document(s):

Abstract:

Vinasse is the most abundant effluent in ethanol biorefineries. Biogas production from vinasse is a suitable alternative to manage this residue, providing energy generation and environmental sustainability for the biorefineries. However, integration of vinasse for anaerobic digestion is challenging since vinasse characteristics require further optimization to enhance biogas production. To obtain higher methane yields, this work have shown that vinasse must be co­digested with other byproducts from biorefineries and also manure from the livestock industry, providing trace elements and balancing carbon and nitrogen contents for improving anaerobic digestion. Two continuous stirred tank reactors (CSTR) were carried out at 37ºC. CSTR­1 was fed with vinasse and supplemented nutritionally with lime fertilizer. CSTR­2 was fed with vinasse and 3% of cow manure. For both reactors, the C/N ratio was adjusted with addition of straw. Biogas production from vinasse was enhanced with cow ­1 ­1 manure, straw and lime fertilizer as co­substrates, achieving methane yields of 9.8 + 1.3 mL CH4 g VSd(CSTR­1) ­1 ­1 and 10.6 + 2.0 mL CH4 g VSd(CSTR­2), at steady state. Lime fertilizer and cow manure were effective for improving anaerobic digestion stability, recovering the ratio acetate/propionate within the optimal range for the anaerobic process, preventing reactor imbalance.

Keywords:

anaerobic digestion, batch reactor, bioethanol, biogas, biorefinery, residues

Topic:

Biomass Conversion Technologies for Heating, Cooling and Electricity

Subtopic:

Anaerobic digestion for biogas production

Event:

22nd European Biomass Conference and Exhibition

Session:

2CO.5.4

Pages:

498 - 501

ISBN:

978-88-89407-52-3

Paper DOI:

10.5071/22ndEUBCE2014-2CO.5.4

Price:

FREE