Levels and Patterns of Polycyclic Aromatic Hydroca

Authors: Wang Ruwei Zhang Jiamei Liu Jingjing Guijian Liu

Publish Date: 2013/04/17

Volume: 65, Issue: 2, Pages: 193-202

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Abstract

Fly ash and bottom ash samples were collected from a coalfired power plant located in Anhui province China Mineral phases and morphologies of the samples were determined by Xray diffraction and scanning electron microscopy respectively Sixteen polycyclic aromatic hydrocarbon PAH 16 compounds specified in United States Environmental Protection Agency Method 610 properties in ash samples were investigated In fly ashes ∑16PAH total amount of 16 PAHs and ∑CPAH total amount of 8 carcinogenic PAHs levels varied from 093 to 208 μg/g and from 026 to 087 μg/g respectively In bottom ashes ∑16PAH and ∑CPAH levels varied from 283 to 532 and 176 to 376 μg/g respectively Fly ashes were dominated by medium molecularweight PAHs and low molecularweight PAHs whereas bottom ashes were abundant in 5 and 6ring PAH species The CPAHs levels of some ashes especially bottom ashes are greater than the limits regulated by several countries indicating that this type of coal combustion product requires special treatment before landfill PAH levels and patterns in fly ash were evidently affected by particle size and total organic content had a closer correlation with PAH content than particle size in bottom and fly ash which may be due to unburned carbon existing in bottom ashThis work was supported by the National Natural Science Foundation of China Grant No 41173032 Fundamental Research Funds for the Central Universities Grant No WK2080000041 and the National Science and Technology Support Program Grant No 1012BAC10B02 We thank the editors and anonymous reviewers for giving us many constructive comments which significantly improved the manuscript

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