BioChem - DOS

Improving production of volatile fatty acids from food waste fermentation by hydrothermal pretreatment

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

Yin, J.; Wang, K.; Yang, Y.; Shen, D.; Wang, M.; Mo, H.

Food waste (FW) was pretreated by a hydrothermal method and then fermented for volatile fatty acid (VFAs) production. The soluble substance in FW increased after hydrothermal pretreatment (&le;200<SUP>o</SUP>C). Higher hydrothermal temperature would lead to mineralization of the organic compounds. The optimal temperature for organic dissolution was 180<SUP>o</SUP>C, at which FW dissolved 42.5% more soluble chemical oxygen demand than the control. VFA production from pretreated FW fermentation was significantly enhanced compared with the control. The optimal hydrothermal temperature was 160<SUP>o</SUP>C with a VFA yield of 0.908g/g VS<SUB>removal</SUB>. Butyrate and acetate were the prevalent VFAs followed by propionate and valerate. FW fermentation was inhibited after 200<SUP>o</SUP>C pretreatment. The VFAs were extracted from the fermentation broth by liquid-liquid extraction. The VFA recovery was 50-70%. Thus, 0.294-0.411g VFAs could be obtained per gram of hydrothermally pretreated FW (in dry weight) by this method.

2014

Elsevier Applied Science

0960-8524

171

pp.323-329

10.1016/j.biortech.2014.08.062

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART70347337

Food waste; Volatile fatty acids; Hydrothermal pretreatment; Fermentation; VFAs extraction