Wen-Hsi Cheng This email address is being protected from spambots. You need JavaScript enabled to view it.1, Chun-Hung Lin2, Chung-Shin Yuan This email address is being protected from spambots. You need JavaScript enabled to view it.2, Ken-Lin Chang2 

1 Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung 831301, Taiwan
2 Institute of Environmental Engineering, National Sun Yat-Set University, Kaohsiung 804201, Taiwan


Received: December 3, 2022
Revised: February 12, 2023
Accepted: February 14, 2023

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.220440  

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Cite this article:

Cheng, W.H., Lin, C.H., Yuan, C.S., Chang, K.L. (2023). VOC Emissions from a Rendering Plant and Evaluation for Removal of Pentanal by Oxidization Using Hydrogen Peroxide. Aerosol Air Qual. Res. 23, 220400. https://doi.org/10.4209/aaqr.220440


  • In Taiwan, rendering plants emitted VOCs and odors.
  • VOC emissions from a rendering plant were sampled and analyzed.
  • Aldehydes are mainly produced during cooking and drying process.
  • Hydrogen peroxide was an effective oxidant of pentanal in a reactor.


Rendering plants treat dead livestock and produce grease and bone meal. In a rendering plant, the cooking and drying processes are the main sources of odor emissions. Non-fresh dead livestock reduce the performance of odor control devices, and in Taiwan, the treatment facilities in a rendering plant mostly are operated in a batch feeding, which causes volatile organic compound (VOC) emissions in the exhausted gas, that always caused complaints from the nearby neighborhood. This study used respectively ozone and hydrogen peroxide to evaluate the removal efficiencies of pentanal, hexanal and toluene those are common VOCs in the rendering exhaustion. Experimental results indicated that ozone could not effectively reduce aldehydes and toluene, and the residual ozone remaining in the exhaust gas is a secondary air pollutant and irritate the human respiratory tracts. Oppositely, hydrogen peroxide effectively removed pentanal as a feasible VOC treatment oxidant by adding into a contact reactor. When the pentanal exhaustion concentration from the rendering process was around 36.23 ppm in the flue with the flow rates from 100 to 250 Nm3 min–1, the reaction rate constant of pentanal for the first-order reaction by aqueous hydrogen peroxide of 1,000 mg L–1 was obtained as 0.536 1 s–1, and then the pentanal reduced to 0.68 to 2 ppm. Based on the simulation using the Gaussian dispersion model, the concentration ranges of pentanal in the exhausted stream resulted in the pentanal emission rate lower than 0.01 g s–1, which no longer causes surrounding residents’ complaints.

Keywords: Rendering, Ozone, Hydrogen peroxide, Pentanal, Volatile organic compounds, Oxidation

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