4.7 Article

Microbial oil and biodiesel production in an integrated sugarcane biorefinery: Techno-economic and life cycle assessment

期刊

JOURNAL OF CLEANER PRODUCTION
卷 379, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.134487

关键词

Bioethanol; Biodiesel; Microbial oil; Rhodotorula toruloides; Techno-economic analysis; Life cycle analysis

资金

  1. FAPESP (Sao Paulo State Research Funding Agency, Brazil) [2016/10636-8, 2019/15851-2, 2018/09692-6]
  2. CNPq (National Council for Scientific and Technological Development, Brazil)
  3. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]

向作者/读者索取更多资源

This study focuses on the techno-economic-environmental analysis of the integrated production of first-generation bioethanol, bioelectricity, and biodiesel in a Brazilian sugarcane biorefinery, utilizing MO from the yeast R. toruloides for biodiesel production. The integrated biorefinery processes 4.0 million tons of sugarcane per harvest, producing 71.7 m3/h of bioethanol, 2.55 m3/h of biodiesel, and 86.3 MW of surplus bioelectricity. Life cycle assessment indicates lower environmental impact compared to first-generation bioethanol plants. The integrated process demonstrates positive economic performance, making it a feasible industrial option with promising outcomes.
Biodiesel and bioethanol play an important role as renewable liquid fuels. Bagasse, a by-product from the bioethanol industry, can generate a sugarcane bagasse hemicellulose hydrolysate (SCBH) that contains fermentable sugars, mainly xylose. Oleaginous yeasts (eg., Rhodotorula toruloides) can grow in SCBH, producing microbial oil (MO), a source of triacylglycerol for biodiesel production. The integration of bioethanol and biodiesel (from MO) production may be a promising approach in order to exploit synergies between bioethanol and biodiesel processes within a biorefinery. This integration may improve the economic and environmental performance of both processes. This work presents the techno-economic-environmental analysis of the integrated production of first-generation bioethanol, bioelectricity, and biodiesel in a Brazilian sugarcane biorefinery, where MO from the yeast R. toruloides feeds the biodiesel unit. The biorefinery, processing 4.0 million t of sugarcane per harvest, produces 71.7 m3/h of bioethanol, 2.55 m3/h of biodiesel (that can replace 75.6% of the diesel demand in the field), and 86.3 MW of surplus bioelectricity. A life cycle assessment shows that the integrated biorefinery had a lower environmental impact than the first-generation bioethanol plant. The integrated process exhibits a positive economic performance (net present value of approx. 110 million of dollars and internal rate of return of about 14.5% per year, higher than the minimum acceptable rate of return, assumed as 11% per year), indicating that this is a feasible industrial option. Sensitivity analysis shows that R&D should mainly focus on the MO bioreactor operation.

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