Mechanisms of heavy-metal removal by activated sludge

作者：Pagnanelli F^*; Mainelli S; Bornoroni L; Dionisi D; Toro L

来源：Chemosphere, 2009, 75(8): 1028-1034.

DOI：10.1016/j.chemosphere.2009.01.043

• Biosorption
• Heavy metals
• Activated sludge
• Potentiometric titration
• Metal speciation

This paper investigates the chemical mechanisms operating in cadmium and lead removal by activated sludge in sequencing batch reactors. Selective extraction and acid digestion of sludge samples denoted that both Cd and Pb are mainly present as surface-bound metals. Characterisation of sludge samples by potentiometric titrations and IR spectra suggested that carboxylic and amino groups are the main active sites responsible for the binding proper-ties of the biomass. Simulation of metal speciation implemented with complexation constants determined in biosorption tests, showed that cadmium predominates as biosorbed species, while lead was mainly removed by precipitation.

• 出版日期2009-5