Environmental Science and Pollution Research

, Volume 25, Issue 34, pp 34131–34138 | Cite as

Effect of biodiesel on PAH, OPAH, and NPAH emissions from a direct injection diesel engine

  • Xinling LiEmail author
  • Ye Zheng
  • Chun Guan
  • Chun Shun Cheung
  • Zhen Huang
Research Article


Polycyclic aromatic hydrocarbon (PAH), oxy- and nitro-derivate PAH (OPAH and NPAH) emissions from a direct injection diesel engine fueled with conventional fossil diesel (D), waste cooking oil biodiesel (B100), and their two blends (B20 and B50) were compared. The results show that B100 can reduce low molecular weight PAHs such as naphthalene, acenaphthylene, and fluorene as much as 90% compared with diesel. However, the emissions of high molecular weight PAHs including benzo[b]fluoranthene, benzo[k]fluoranthene, and benzo[a]pyrene decrease slightly when using B100. The emission levels for PAHs and OPAHs present comparable, while NPAH emission levels are five to ten times lower than those of PAHs and OPAHs. Compared with diesel, PAH and NPAH emissions significantly decrease. On the contrary, an increase trend of OPAH emission has been observed with adding biodiesel. For the specific parent PAHs and its oxygenated and nitrated derivatives, the fractions of parent PAHs gradually decrease with increasing biodiesel content in the blends, while the corresponding oxygenated and nitrated derivative fractions observably increase, especially for the high molecular weight compounds. Considering the increase of OPAH and NPAH fractions in total particle-phase PAHs when using biodiesel, in-depth biodiesel cytotoxicity assessment should be conducted.


Diesel engine Biodiesel PAH, OPAH, and NPAH emissions 


Funding information

The National Natural Science Foundation of China (No. 51576127, 51436005) financially supported this study.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory for Power Machinery and Engineering of M.O.EShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Institute of Eco-Chongming (IEC)ShanghaiChina
  3. 3.Department of Mechanical EngineeringThe Hong Kong Polytechnic UniversityHung HomHong Kong

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