Energy balance of biofuel production from biological conversion of crude glycerol

Journal of Environmental Management
Xiaolei ZhangJose R Valéro

Abstract

Crude glycerol, a by-product of biodiesel production, has gained significant attention as a carbon source for biofuel production. This study evaluated the energy balance of biodiesel, hydrogen, biogas, and ethanol production from 3.48 million L of crude glycerol (80% w/v). The conversion efficiency (energy output divided by energy invested) was 1.16, 0.22, 0.27, and 0.40 for the production of biodiesel, hydrogen, biogas, and ethanol respectively. It was found that the use of crude glycerol for biodiesel production was an energy gain process, with a positive energy balance and conversion efficiency of greater than 1. The energy balance revealed a net energy gain of 5226 GJ per 1 million kg biodiesel produced. Production of hydrogen, biogas and ethanol from crude glycerol were energy loss processes. Therefore, the conversion of crude glycerol to lipids and subsequently to biodiesel is suggested to be a better option compared to hydrogen, biogas, or ethanol production with respect to energy balance.

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Citations

Sep 1, 2018·Bioprocess and Biosystems Engineering·Aline Gomes de Oliveira Paranhos, Edson Luiz Silva
Jan 14, 2021·Preparative Biochemistry & Biotechnology·Miao TianPeng-Mei Lv
Nov 2, 2018·Bioresource Technology·Lalit R KumarR D Tyagi

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Biofuels (ASM)

Biofuels are produced through contemporary processes from biomass rather than geological processes involved in fossil fuel formation. Examples include biodiesel, green diesel, biogas, etc. Discover the latest research on biofuels in this feed.

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