Distribution of Pb(II) in the chemical fractions of activated sludge during sorption

作者：Zhang, Guowei; Liu, Dongfang^*; Song, Xiancai; Meng, Xianrong; Frigon, Matthew; Lu, Jianbo; Li, Kexun

来源：Desalination and Water Treatment, 2016, 57(5): 2040-2051.

DOI：10.1080/19443994.2014.984340

• Activated sludge
• Pb(II)
• Chemical fraction
• Sorption
• XPS

Distribution of Pb(II) in the chemical fractions of activated sludge during sorption was investigated in this study. The Community Bureau of Reference sequential extraction procedure was applied to the sludge samples to evaluate the effect of contact time, pH, temperature, and Cu(II) concentration on the distribution of Pb(II) in the chemical fractions. Results indicated that there was a significant correlation between the chemical fraction distribution of Pb(II) and changes in all the above mentioned parameters. With a rise in pH, Pb(II) in the acid soluble/exchangeable fraction increased from 0.62 to 2.91mg/g. And the reducible, oxidizable, and residual fractions reached a maxima of 4.75, 3.45, and 2.81mg/g at pH7, respectively. With increasing Cu(II) concentration, Pb(II) in the acid soluble/exchangeable, oxidizable, and residual fraction decreased by 0.4, 2.21, and 1.66mg/g. Conversely, sorption of the reducible fraction reversely increased by 2.45mg/g. The Langmuir and Freundlich models were applied to describe equilibrium isotherms, and the sorption isotherm data were described well by both models. X-ray photoelectron spectroscopic measurements confirmed the existence of acid soluble/exchangeable and oxidizable fractions of Pb(II) in the activated sludge at the molecular level.

• 出版日期2016-1-26
• 单位南开大学