Butanol production from food waste: a novel process for producing sustainable energy and reducing environmental pollution

Biotechnology for Biofuels

Nasib Qureshi¹  Vijay Singh²  Haibo Huang² 

[1]Bioenergy Research Unit, United States Department of Agriculture, ARS, National Center for Agricultural Utilization Research, 1815N. University Street, Peoria 61604, IL, USA

[2]Department of Agricultural and Biological Engineering, University of Illinois at Urbana Champaign, 1304W. Pennsylvania Avenue., Urbana 61801, IL, USA

关键词: Energy;    Process integration;    Vacuum stripping;    Fermentation;    Food waste;    Butanol;   

Others  :  1228131
DOI  :  10.1186/s13068-015-0332-x

 received in 2015-04-21, accepted in 2015-09-01,  发布年份 2015

【 摘 要 】

Background

Waste is currently a major problem in the world, both in the developing and the developed countries. Efficient utilization of food waste for fuel and chemical production can positively influence both the energy and environmental sustainability. This study investigated using food waste to produce acetone, butanol, and ethanol (ABE) by Clostridium beijerinckii P260.

Results

In control fermentation, 40.5 g/L of glucose (initial glucose 56.7 g/L) was used to produce 14.2 g/L of ABE with a fermentation productivity and a yield of 0.22 g/L/h and 0.35 g/g, respectively. In a similar fermentation 81 g/L of food waste (containing equivalent glucose of 60.1 g/L) was used as substrate, and the culture produced 18.9 g/L ABE with a high ABE productivity of 0.46 g/L/h and a yield of 0.38 g/g. Fermentation of food waste at higher concentrations (129, 181 and 228 g/L) did not remarkably increase ABE production but resulted in high residual glucose due to the culture butanol inhibition. An integrated vacuum stripping system was designed and applied to recover butanol from the fermentation broth simultaneously to relieve the culture butanol inhibition, thereby allowing the fermentation of food waste at high concentrations. ABE fermentation integrated with vacuum stripping successfully recovered the ABE from the fermentation broth and controlled the ABE concentrations below 10 g/L during fermentation when 129 g/L food waste was used. The ABE productivity with vacuum fermentation was 0.49 g/L/h, which was 109 % higher than the control fermentation (glucose based). More importantly, ABE vacuum recovery and fermentation allowed near-complete utilization of the sugars (~98 %) in the broth.

Conclusions

In these studies it was demonstrated that food waste is a superior feedstock for producing butanol using Clostridium beijerinckii. Compared to costly glucose, ABE fermentation of food waste has several advantages including lower feedstock cost, higher productivity, and less residual sugars.

【 授权许可】

   
2015 Huang et al.

【 图 表 】

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