Lactic acid and methane: Improved exploitation of biowaste potential

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논문

Lactic acid and methane: Improved exploitation of biowaste potential

학술지

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

저자명

Dreschke, G.; Probst, M.; Walter, A.; Pumpel, T.; Walde, J.; Insam, H.

초록

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 37oC using the indigenous microbiome. Experiments revealed an optimal fermentation period of 24h resulting in high yields of lactic acid (up to 37gkg-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+/-41Nmlbiomethaneg-1 volatile solids. Digestate, the only end product of this process can be used as organic fertilizer.

발행연도

2015

발행기관

Elsevier Applied Science

ISSN

0960-8524

권

176

페이지

pp.47-55

DOI

10.1016/j.biortech.2014.10.136