Optimization of hydrolysis and volatile fatty acids production from sugarcane filter cake: Effects of urea supplementation and sodium hydroxide pretreatment
2015; Elsevier BV; Volume: 199; Linguagem: Inglês
10.1016/j.biortech.2015.07.117
ISSN1873-2976
AutoresLeandro Janke, Athaydes F. Leite, Karla de Aleluia Batista, Sören Weinrich, Heike Sträuber, Marcell Nikolausz, Michael Nelles, Walter Stinner,
Tópico(s)Microbial Metabolic Engineering and Bioproduction
ResumoDifferent 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 6 g NaOH/100 g FCFM improved both the COD solubilization and the VFA yield by 37%, mainly consisted by n-butyric and acetic acids.
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