Particle emissions from microalgae biodiesel combustion and their relative oxidative potential

Rahman, M. M., Stevanovic, S., Islam, M. A., Heimann, K., Nabi, M. N., Thomas, G., Feng, B., Brown, R. J. and Ristovski, Z. D. (2015) Particle emissions from microalgae biodiesel combustion and their relative oxidative potential. Environmental Sciences: Processes and Impacts, 17 9: 1601-1610. doi:10.1039/c5em00125k


Author Rahman, M. M.
Stevanovic, S.
Islam, M. A.
Heimann, K.
Nabi, M. N.
Thomas, G.
Feng, B.
Brown, R. J.
Ristovski, Z. D.
Title Particle emissions from microalgae biodiesel combustion and their relative oxidative potential
Journal name Environmental Sciences: Processes and Impacts   Check publisher's open access policy
ISSN 2050-7895
2050-7887
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1039/c5em00125k
Open Access Status Not Open Access
Volume 17
Issue 9
Start page 1601
End page 1610
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2016
Language eng
Abstract Microalgae are considered to be one of the most viable biodiesel feedstocks for the future due to their potential for providing economical, sustainable and cleaner alternatives to petroleum diesel. This study investigated the particle emissions from a commercially cultured microalgae and higher plant biodiesels at different blending ratios. With a high amount of long carbon chain lengths fatty acid methyl esters (C20 to C22), the microalgal biodiesel used had a vastly different average carbon chain length and level of unsaturation to conventional biodiesel, which significantly influenced particle emissions. Smaller blend percentages showed a larger reduction in particle emission than blend percentages of over 20%. This was due to the formation of a significant nucleation mode for the higher blends. In addition measurements of reactive oxygen species (ROS), showed that the oxidative potential of particles emitted from the microalgal biodiesel combustion were lower than that of regular diesel. Biodiesel oxygen content was less effective in suppressing particle emissions for biodiesels containing a high amount of polyunsaturated C20–C22 fatty acid methyl esters and generated significantly increased nucleation mode particle emissions. The observed increase in nucleation mode particle emission is postulated to be caused by very low volatility, high boiling point and high density, viscosity and surface tension of the microalgal biodiesel tested here. Therefore, in order to achieve similar PM (particulate matter) emission benefits for microalgal biodiesel likewise to conventional biodiesel, fatty acid methyl esters (FAMEs) with high amounts of polyunsaturated long-chain fatty acids (≥C20) may not be desirable in microalgal biodiesel composition.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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