van Hullebusch Eric D, Peerbolte Annemarie, Zandvoort Marcel H, Lens Piet N L
Sub-department of Environmental Technology, Wageningen Agricultural University, Biotechnion--Bomenweg 2, PO Box 8129, 6700 EV Wageningen, The Netherlands.
Chemosphere. 2005 Jan;58(4):493-505. doi: 10.1016/j.chemosphere.2004.09.017.
The objective of this study was to investigate the sorption capacity and the fractionation of sorbed nickel and cobalt onto anaerobic granular sludges. Two different anaerobic granular sludges (non-fed, pH=7) were loaded with nickel and cobalt in adsorption experiments (monometal and competitive conditions). The combination of sequential extraction with the sorption isotherm analysis allowed the assessment of the sorption capacity of individual fractions present in the anaerobic granular sludges. The operational fractionation of the sorbed heavy metals was determined using a modified Tessier sequential extraction procedure. The sorption characteristics of each extracted fraction (exchangeable, carbonates, organic matter/sulfides and residual fractions) fitted well to the Langmuir model. The organic matter/sulfides fraction showed the highest affinity for cobalt and nickel in both sludges investigated compared to the other operationally defined fractions. The presence of iron negatively affected cobalt and nickel accumulation in this organic matter/sulfides fraction. The trace metals-iron sulfide interactions are likely to be the key process in controlling the distribution of cobalt and nickel during sorption onto non-fed methanogenic granules due to the high affinity of iron sulfides towards the metals studied.
本研究的目的是调查厌氧颗粒污泥对镍和钴的吸附容量以及吸附态镍和钴的形态分布。在吸附实验（单金属和竞争条件）中，向两种不同的厌氧颗粒污泥（未进料，pH = 7）中加入镍和钴。连续萃取与吸附等温线分析相结合，能够评估厌氧颗粒污泥中各组分的吸附容量。采用改进的Tessier连续萃取程序确定吸附态重金属的操作形态分布。各萃取组分（可交换态、碳酸盐结合态、有机质/硫化物结合态和残渣态）的吸附特性均很好地符合Langmuir模型。在所研究的两种污泥中，与其他操作定义的组分相比，有机质/硫化物结合态对钴和镍的亲和力最高。铁的存在对该有机质/硫化物结合态中钴和镍的积累有负面影响。由于硫化铁对所研究金属具有高亲和力，痕量金属-硫化铁相互作用可能是控制在未进料的产甲烷颗粒上吸附过程中钴和镍分布的关键过程。
