Contents and characteristics of polycyclic aromatic hydrocarbons in municipal sewage sludge from cities in Yangtze River Delta area.

Concentrations of polycyclic aromatic hydrocarbons(PAHs) in sewage sludge derived from 41 typical municipal wastewater treatment plants(WWTPs) in the Yangtze River Delta area of China were determined by gas chromatography-mass spectrometry(GCMS).The results showed that the sewage sludge samples contained polycyclic aromatic hydrocarbon compounds generally,among which 3-ring and 4-ring compounds were predominant,while the volatile 2-ring and refractory 5-ring and 6-ring compounds were less.The total quantity of PAHs ranged from 8.543 to 55.807 μg /g.Significant differences existed between ΣPAHs content from different sludge samples.PAHs in different regions were significantly different,which average is Zhejiang(34.117 μg /g) Jiangsu(19.487 μg/g) Shanghai(10.665 μg/g);PAHs of different types urban sludge is little difference,which average is industrial sewage sludge(28.912 μg/g) scramble the sludge(26.843 μg/g) sewage sludge(26.843 μg/g).