Polycyclic Aromatic Hydrocarbons (PAHs) in Municipal Sewage Sludge of Jiangsu Province
江苏省城市污泥中多环芳烃的含量及其主要影响因素分析

Sewage sludge from 21 representative sewage treatment plants of Jiangsu Provice were measured for polycyclic aromatic hydrocarbons (PAHs) using HPLC. Results showed that PAHs were widely distributed in municipal sewage sludges. Total amount of PAHs (sigma PAHs, 16 PAHs in the priority contaminants of US EPA )ranged from 11.68 mg x kg(-1) to 169.91 mg x kg(-1), depending on sludge origins. Total concentration of carcinogenic PAHs was 1.17 mg x kg(-1) to 41.03 mg x kg(-1) with an average value of 6.59 mg x kg(-1). Total amount of PAHs classified as a priority contaminants in the light of regulations of EPA China was from 4.07 mg x kg(-1) to 59.06 mg x kg(-1). PAH Compounds with two or three benzene rings were dominant among the 7-16 PAHs found in the sludge, while the percentage of compounds containing four to six benzene rings was low. Naphthalin was the main PAHs' compounds in the selected municipal sludg. The concentration of BaP, a strong carcinogenic PAH, was found in sludge with 0-2.20 mg x kg(-1) and the average of 0.15 mg x kg(-1), which was much less than 3.0 mg x kg(-1) of the control standard of sludge land application. Furthermore, it was also noted that wastewater types, sewage treatment techniques, and anaerobically sludge digestion had great effects on PAHs contents in sludge.