BioChem - DOS

Effect of pH and retention time on volatile fatty acids production during mixed culture fermentation

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

Jankowska, E.; Chwialkowska, J.; Stodolny, M.; Oleskowicz-Popiel, P.

Mixed culture fermentation consists of stable microbial population hence waste could be potentially used as a substrates. The aim of the work was to investigate the impact of pH and retention time on the anaerobic mixed culture fermentation. Trials at different pH (4-12) in unbuffered systems were conducted for 5, 10 and 15days. The highest VFAs concentration was achieved after 15days at pH 10 (0.62g/gVS<SUB>added</SUB>), promising results were also achieved for pH 11 (0.54g/gVS<SUB>added</SUB>). For pH 4 and short retention time propionic acid was the major product instead of acetic acid. For batches run at 15days (besides pH 6) caproic acid presence was noticed whereas at pH 11 occurrence of succinic was quantified. Significant correlation between operational factors and fermentation's effluents was proved. Throughout changing simple operating parameters one could design process to produce desirable concentration and composition of VFAs.

2015

Elsevier Applied Science

0960-8524

190

pp.274-280

10.1016/j.biortech.2015.04.096

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART72187305

Volatile fatty acids; Mixed culture fermentation; Anaerobic digestion