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Polycyclic aromatic hydrocarbons on particulate matter emitted during the co-generation of bioenergy and biochar from rice husk

Author:
Dunnigan, Lewis, Morton, Benjamin J., van Eyk, Philip J., Ashman, Peter J., Zhang, Xiangping, Hall, Philip Anthony, Kwong, Chi Wai
Source:
Bioresource technology 2017 v.244 pp. 1015-1023
ISSN:
0960-8524
Subject:
benzo(a)pyrene, biochar, biofuels, combustion, emissions, particulates, pollutants, polycyclic aromatic hydrocarbons, pyrolysis, rice hulls, temperature, toxicity
Abstract:
The aim of this study was to evaluate the emissions of polycyclic aromatic hydrocarbons (PAHs) bound to the particulate matter (PM) during the combustion of raw pyrolysis volatiles (bio-oil and pyrogas mixture) generated from the pyrolysis of rice husk. Five different raw pyrolysis volatiles were produced at varying pyrolysis temperatures (400–800°C) and subsequently combusted in a laboratory-scale, continuous pyrolysis-combustion facility at 850°C. 15 priority pollutant PAH levels in the resulting biochar, bio-oil, and PM were evaluated. Results showed that combustion of the raw pyrolysis volatiles produced at elevated pyrolysis temperatures resulted in greater concentrations of PM-bound PAHs (119% increase between 400 and 800°C) due to the increased PAH and oxy-aromatic content of the bio-oil fraction. Significantly increased benzo(a)pyrene (BaP) – equivalent toxicity of the biochar and PM was observed at elevated pyrolysis temperatures.
Agid:
5825662