Biomethane production by thermophilic co-digestion of sugarcane vinasse and whey in an AnSBBR: Effects of composition, organic load, feed strategy and temperature

Autor(es)

Albuquerque, J. N. ^[1] ; Ratusznei, S. M. ^[2] ; Rodrigues, J. A. D. ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo Univ EESC USP, Sao Carlos Sch Engn, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[2] Maua Inst Technol EEM IMT, Maua Sch Engn, Praca Maua 1, BR-09580900 Sao Caetano do Sul, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Environmental Management; v. 251, DEC 1 2019.
• Citações Web of Science: 0

Resumo

This work investigated the application of a thermophilic (55 degrees C) anaerobic reactor with immobilized biomass, mechanically stirred and operated in sequential batch and fed batch (AnSBBR) for environmental compliance and methane production by co-digesting cheese whey (W) and sugarcane vinasse (V). The assays were performed in four steps. In the first step the composition of 75%W:25%V (on a COD basis) was determined to be the most adequate for the anaerobic process. In the second step the applied volumetric organic load (AVOL) was increased and in the third step the feed strategy was modified achieving best results at AVOL of 25 gCOD.m(-3).d(-1), in which the removed organic matter efficiency was 72%, the molar productivity was 278 molCH(4).m(-3).d(-1) and methane yield was 15.3 mmolCH(4).gCOD(-1). In the fourth step the temperature was modified to 50 degrees C and 45 degrees C, achieving worse results. From the kinetic model adjusted to experimental data it was identified that the acetoclastic route was predominant in methane generation. The estimated energy recovered by co-digesting cheese whey and sugarcane vinasse using industrial information was 2.2 x 10(4) MW h per month, equivalent (in Brazil) to the electricity consumption of about 135 x 10(3) inhabitants or monthly savings of US\$ 1,653,000 replacing the diesel oil consumed in the industry. (AU)

• Processo FAPESP: 15/06246-7 - Aplicação do conceito de biorrefinaria a estações de tratamento biológico de águas residuárias: o controle da poluição ambiental aliado à recuperação de matéria e energia
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Temático