BioChem - DOS

Optimization of hydrolysis and volatile fatty acids production from sugarcane filter cake: Effects of urea supplementation and sodium hydroxide pretreatment

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Janke, L.; Leite, A.; Batista, K.; Weinrich, S.; Strauber, H.; Nikolausz, M.; Nelles, M.; Stinner, W.

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 FC<SUB>FM</SUB> improved both the COD solubilization and the VFA yield by 37%, mainly consisted by n-butyric and acetic acids.

2016

Elsevier Applied Science

0960-8524

199

pp.235-244

10.1016/j.biortech.2015.07.117

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART73369361

Sugarcane; Filter cake; Anaerobic digestion; Volatile fatty acid; Pretreatment