BioChem - DOS

Semi-continuous methane production from undiluted brown algae using a halophilic marine microbial community

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

Miura, T.; Kita, A.; Okamura, Y.; Aki, T.; Matsumura, Y.; Tajima, T.; Kato, J.; Nakashimada, Y.

Acclimated marine sediment-derived culture was used for semi-continuous methane production from materials equivalent to raw brown algae, without dilution of salinity and without nutrient supply, under 3 consecutive conditions of varying organic loading rates (OLRs) and hydraulic retention time (HRT). Methane production was stable at 2.0gVS/kg/day (39-day HRT); however, it became unstable at 2.9gVS/kg/day (28-day HRT) due to acetate and propionate accumulation. OLR subsequently decreased to 1.7gVS/kg/day (46-day HRT), stabilizing methane production beyond steady state. Methane yield was above 300mL/g VS at all OLRs. These results indicated that the acclimated marine sediment culture was able to produce methane semi-continuously from raw brown algae without dilution and nutrient supply under steady state. Microbial community analysis suggested that hydrogenotrophic methanogens predominated among archaea during unstable methane production, implying a partial shift of the methanogenic pathway from acetoclastic methanogenesis to acetate oxidation.

2016

Elsevier Applied Science

publisher-specific-oa

0960-8524

200

pp.616-623

10.1016/j.biortech.2015.10.090

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART73553346

http://manuscript.elsevier.com/S0960852415014947/pdf/S0960852415014947.pdf

Semi-continuous methane production; Brown algae; Undiluted conditions; Microbial community