期刊
BIORESOURCE TECHNOLOGY
卷 176, 期 -, 页码 47-55出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.10.136
关键词
Fermentation; Municipal organic solid waste; Biogas potential; Lactobacillus; Waste treatment
资金
- Klima- und Energiefonds project BioKasEn
- Nachwuchsforderung'' of the Universitat Innsbruck
- Doktoratsstipendium aus der Nachwuchsforderung
- Stipendium fur osterreichische Graduierte of the Universitat Innsbruck
This feasibility study investigated a two-step biorefining approach to increase the value gained by recycling of organic municipal solid waste. Firstly, lactic acid was produced via batch fermentation at 37 degrees C using the indigenous microbiome. Experiments revealed an optimal fermentation period of 24 h resulting in high yields of lactic acid (up to 37 g kg(-1)). The lactic acid proportion of total volatile fatty acid content reached up to 83%. Lactobacilli were selectively enriched to up to 75% of the bacterial community. Additionally conversion of organic matter to lactic acid was increased from 22% to 30% through counteracting end product inhibition by continuous lactic acid extraction. Secondly, fermentation residues were used as co-substrate in biomethane production yielding up to 618 +/- 41 Nml biomethane g(-1) volatile solids. Digestate, the only end product of this process can be used as organic fertilizer. (C) 2014 Elsevier Ltd. All rights reserved.
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