Optimization of hydrolysis and volatile fatty acids production from sugarcane filter cake: Effects of urea supplementation and sodium hydroxide pretreatment.
Different methods for optimization the anaerobic digestion (AD) of sugarcane filter cake (FC) with a special focus on volatile fatty acids (VFA) production were studied. Sodium hydroxide (NaOH) pretreatment at different concentrations was investigated in batch experiments and the cumulative methane yields fitted to a dual-pool two-step model to provide an initial assessment on AD. The effects of nitrogen supplementation in form of urea and NaOH pretreatment for improved VFA production were evaluated in a semi-continuously operated reactor as well. The results indicated that higher NaOH concentrations during pretreatment accelerated the AD process and increased methane production in batch experiments. Nitrogen supplementation resulted in a VFA loss due to methane formation by buffering the pH value at nearly neutral conditions (∼ 6.7). However, the alkaline pretreatment with 6g NaOH/100g FCFM improved both the COD solubilization and the VFA yield by 37%, mainly consisted by n-butyric and acetic acids.
Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany. Electronic address: leandro.janke@dbfz.de.
Leandro
L
Janke
Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany.
Athaydes
A
Leite
Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany.
Karla
K
Batista
Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany.
Sören
S
Weinrich
Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany.
Heike
H
Sträuber
Department of Environmental Microbiology, UFZ - Helmholtz Centre for Environmental Research, Permoserstraße 15, 04318 Leipzig, Germany.
Marcell
M
Nikolausz
Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany.
Michael
M
Nelles
Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany.
Walter
W
Stinner
D061249:Batch Cell Culture Techniques; D056804:Biofuels / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000096:biosynthesis*; D005374:Filtration / Q000295:instrumentation*; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis; D017942:Nitric Acid / Q000494:pharmacology; D025341:Principal Component Analysis; D031786:Saccharum / Q000737:chemistry* / Q000187:drug effects; D012972:Sodium Hydroxide / Q000494:pharmacology*; D014508:Urea / Q000494:pharmacology*
D056804:Biofuels; D005232:Fatty Acids, Volatile; D017942:Nitric Acid; D012972:Sodium Hydroxide; D014508:Urea; D008697:Methane
Anaerobic digestion; Filter cake; Pretreatment; Sugarcane; Volatile fatty acid