Sustainable biorefinery concept for biofuel production through holistic volarization of food waste

Document identifier: oai:DiVA.org:ltu-76458
Access full text here:10.1016/j.biortech.2019.122247
Keyword: Engineering and Technology, Industrial Biotechnology, Bioprocess Technology, Teknik och teknologier, Industriell bioteknik, Bioprocessteknik, Food waste, Enzymatic hydrolysis, Microalgae, Heterotrophic cultivation, Lipids, Fatty acid methyl esters, Biokemisk processteknik, Biochemical Process Engineering
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 12 Responsible consumption and productionSDG 2 Zero hungerSDG 11 Sustainable cities and communities
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

The aim of this study was to utilize the whole food waste in two stages. In the first stage, the carbohydrate and protein fractions of food waste recovered after enzymatic hydrolysis was used to cultivate heterotrophic microalgae, resulting in biomass yield of 0.346 ± 0.09 g/gsugars and lipid yield of 0.216 ± 0.06 g/gsugars. In the second stage, oil (14.15% w/w) was extracted from food waste after hydrolysis and converted to biodiesel by a two-step transesterification reaction that generated 135.8 g/kgfood waste of fatty acid methyl esters and 13.8 g/kgfood waste of crude glycerol. Finally, crude glycerol obtained from both processes was used at 20 g/L to cultivate heterotrophic microalgae, resulting in a cell dry weight and total lipid concentration of 6.23 g/L and 2.91 g/L, respectively. A total 248.21 g of fatty acid methyl esters were obtained from the 1 kg of food waste through this integrated process.

Authors

Alok Patel

Luleå tekniska universitet; Kemiteknik
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Katerina Hruzova

Luleå tekniska universitet; Kemiteknik
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Ulrika Rova

Luleå tekniska universitet; Kemiteknik
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Paul Christakopoulos

Luleå tekniska universitet; Kemiteknik
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Leonidas Matsakas

Luleå tekniska universitet; Kemiteknik
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