Enhancement of methane production from barley waste

• Autor(a) principal: Neves, L.
• Data de Publicação: 2006
• Outros Autores: Ribeiro, R., Oliveira, Rosário, Alves, M. M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/4997
• topic: Anaerobic co-digestion; Biogas; Kitchen waste; Alkaline hydrolysis pre-treatment; Barley waste; Science & Technology

Two different approaches were attempted to try and enhance methane production from an industrial waste composed of 100% barley, which results from production of instant coffee substitutes. In previous work, this waste was co-digested with an excess of activated sludge produced in the wastewater treatment plant located in same industrial unit, resulting in a very poor methane yield (25LCH4(STP)/ kgVSinitial), and low reductions in total solids (31%) and in volatile solids (40%). When the barley waste (BW) was subjected to alkaline hydrolysis pre-treatment before co-digestion with activated sludge, the methane production increased to 222LCH4(STP)/kgVSinitial and the total and volatile solids reductions increased to 67% and 84%, respectively. The second approach, followed in the present work, consisted of co-digestion with kitchen waste (40% BW, 60% kitchen waste). The methane production was 363LCH4(STP)/kgVSinitial and the total and volatile solids reductions were 61% and 67%, respectively.