Two-stage biogas production by co-digesting molasses wastewater and sewage sludge
- 주제(키워드) Co-digestion , Molasses , Sewage sludge , Hydrogen , Methane
- 등재 SCIE, SCOPUS
- 발행기관 SPRINGER
- 발행년도 2014
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000112908
- 본문언어 영어
- Published As http://dx.doi.org/10.1007/s00449-014-1217-2
초록/요약
We evaluated the feasibility of co-digesting molasses wastewater and sewage sludge in a two-stage hydrogen- and methane-producing system. The highest energy was recovered at the 21-h hydraulic retention time (HRT) of the first hydrogenic reactor and at 56-h HRT of the secondary methanogenic reactor. Hence, the two-stage system recovered 1,822 kJ from 1 L of the mixed wastes (19.7: hydrogenic reactor plus, 1,802 kJ L-1: methanogenic reactor). Despite the overloaded VFA-run with a short HRT of 56 h, the GAC-CH4 reactor increased methane production rate and yields due to enhanced pH buffer capacity. An RNA-based community analysis showed that the Ethanoligenens and Methanosaeta dominated the hydrogen and methane bioreactor, respectively. The two-stage system of co-digesting molasses and sewage sludge is particularly cost-effective due to non-pretreatment of sewage sludge.
more