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.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Zhang X,Yan S,Tyagi RD,Surampalli RY,Valéro JRdoi
10.1016/j.jenvman.2015.09.031subject
Has Abstractpub_date
2016-04-01 00:00:00pages
169-76eissn
0301-4797issn
1095-8630pii
S0301-4797(15)30283-8journal_volume
170pub_type
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