【摘要】 城市污泥中重金属的难降解和高毒性限制了污泥的资源化利用。以北京G和Q污水处理厂的压滤出厂污泥为实验材料,采用BCR三步浸提法对污泥中铅砷镉Pb,As,Cd的三种形态进行提取,以HNO3-HClO4进行全量消解,利用ICP-MS检测Pb,As,Cd的全量和各形态的含量,从而为北京城市污泥的资源开发研究提供基础数据。实验结果表明,北京城市污泥中Pb和Cd含量比上世纪末明显降低:其中,G污泥中Pb,As,Cd的全量(干重)分别为19.60,37.96和1.34 mg.kg-1,而Q污泥中分别为19.58,23.46和2.30 mg.kg-1;两种污泥中Pb含量相差甚微,G污泥中As明显高于Q污泥,而Cd则显著低于后者;两种污泥中相应金属的三种形态的变化趋势基本一致:Pb与As以HAc酸溶态为主,H2O2可氧化态最少;而Cd主要以NH2OH-HCl可还原态存在,HAc酸溶态最少。三种重金属中生物毒性大的形态均占70%以上。更多还原

【Abstract】 Heavy metals in municipal sewage sludge can limit the utilization of sludge resources,due to their recalcitrant characteristics and harmful effects.Here,ICP-MS was used to determine the total and special content of Pb,As and Cd in the sewage sludge from G and Q Wastewater Treatment Plants,Beijing.The air-dried samples were dissolved in HNO3-HClO4 before the total content determination,or,sequentially extracted with BCR three-step method before special content determination for the heavy metals.The total contents are 19.60,37.96 and 1.34 mg·kg-1 dry weight(DW) for Pb,As and Cd in the sewage sludge from G Plant,respectively;or,19.58,23.46 and 2.30 mg·kg-1 DW in that from Q Plant,respectively.Pb and Cd decreased dramatically in the total contents,compared to the corresponding data in the late 20th century.Both G and Q sludge samples show similar patterns in the species distribution for the three heavy metals: most of Pb and As are HAc soluble,and least are H2O2 oxidative;while Cd mainly exists in NH2OH-HCl reductive state,seldom in HAc soluble state.Species with high ecotoxicity account for a major part(over 70%) of the three species for all the metals on the whole.The authors’ results provide basic data for the ecological risk assessment and utilization of municipal sewage sludge from Beijing.更多还原