Abstract: Anaerobic granular sludge is used to remove Pb2+ from aqueous solution. The results show that pH, sludge content, initial Pb2+ concentration in aqueous solution and contact time are the main factors affecting the adsorption of Pb2+. It is found that adsorption capacity 121.1 mg/g and adsorption rate 99.5% are achieved when initial Pb2+ concentration is 100 mg/L, pH 4~5 and sludge content 4 g/L, adsorption equilibrium is reached in 60 min. The viable sludge shows higher adsorption capability compared to the nonviable sludge. The adsorption process fits to the Lagergren kinetics equation. Adsorption of Pb2+ on the anaerobic granular sludge follows Lagergren kinetics expression and the experimental data are correlated reasonably well by Langmuir and Freundlich isotherm models. Using 0.1 mol/L HNO3 as desorption reagent, the desorption rate is 93.11% after three times of desorption processing.

Key words: anaerobic granular sludge, Pb2+, adsorption, desorption

摘要： 采用厌氧颗粒污泥对废水中的Pb2+进行了吸附和解吸附研究. 结果表明，影响Pb2+吸附的主要因素是溶液pH、污泥投加量、Pb2+的初始浓度及接触时间. 处理25 mL Pb2+浓度为100 mg/L的(pH 4~5)模拟废水时，投加0.1 g污泥，污泥吸附容量为121.1 mg/g，对废水中Pb2+的吸附率可达99.5%. 未经烘干处理的颗粒污泥有更强的吸附能力，其吸附过程符合Lagergren二级动力学方程，吸附等温线可由Langmuir和Freundlich方程很好地拟合，相关性良好. 吸附Pb2+后的厌氧颗粒污泥用0.1 mol/L硝酸经3次解吸后，解吸率可达93.11%.

关键词: 厌氧颗粒污泥, Pb2+, 吸附, 解吸附