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Two-stage biogas production by co-digesting molasses wastewater and sewage sludge
- 作者：Jung-Yeol Lee (1) (2)
Jeonghee Yun (2)
Tae Gwan Kim (2)
Daehyun Wee (1) (2)
Kyung-Suk Cho (1) (2)
- 关键词：Co ; digestion ; Molasses ; Sewage sludge ; Hydrogen ; Methane
- 刊名：Bioprocess and Biosystems Engineering
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：37
- 期：12
- 页码：2401-2413
- 全文大小：631 KB
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文摘
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?: 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.
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