BioChem - DOS

Improving biomethane yield by controlling fermentation type of acidogenic phase in two-phase anaerobic co-digestion of food waste and rice straw

Chemical engineering journal

Chen, X.; Yuan, H.; Zou, D.; Liu, Y.; Zhu, B.; Chufo, A.; Jaffar, M.; Li, X.

Controlling conditions to obtain different acidogenic fermentation types in a two-phase anaerobic co-digestion were investigated for improving the bio-methane yield from food waste (FW) and rice straw (RS). The results showed that the fermentation type in the acidogenic phase could be transformed by changing oxidation-reduction potential (ORP), pH, and organic loading rate (OLR). Three kinds of fermentation types were observed in acidogenic phase. Ethanol-type fermentation occurred at pH<4.5 and ORP&larr;120mV. Butyric acid-type fermentation appeared in the condition of pH>5.0 with lower ORP and OLR&le;6gVS/Ld. Mixed type fermentation was found in the transformation between butyric acid-type fermentation and ethanol-type fermentation. Among three fermentation types, the butyric-type fermentation achieved the highest acidification degree of 36%, biomethane yield of 535mLCH<SUB>4</SUB>/gVS, and biodegradability of 95%. The finding indicated that controlling fermentation type of acidogenic phase could be one of effective method for achieving high biomethane production.

2015

Elsevier

1385-8947

273

pp.254-260

10.1016/j.cej.2015.03.067

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART72043115

Food waste; Rice straw; Fermentation types; Two-phase anaerobic digestion