Mechanism of heavy-metal removal by activated sludge

F. Pagnanelli; S. Mainelli; L.  Bornoroni; D. Dionisi; L. Toro

doi:10.1016/j.chemosphere.2009.01.043

Mechanism of heavy-metal removal by activated sludge

F. Pagnanelli, S. Mainelli, L. Bornoroni, D. Dionisi, L. Toro

Engineering

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Abstract

This paper investigates the chemical mechanisms operating in cadmium and lead removal by activatedsludge 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 properties 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.

Original language	English
Pages (from-to)	1028-1034
Number of pages	7
Journal	Chemosphere
Volume	75
Issue number	8
DOIs	https://doi.org/10.1016/j.chemosphere.2009.01.043
Publication status	Published - May 2009

Keywords

bisorption
heavy metals
activated sludge
potentiometric titration
metal speciation

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10.1016/j.chemosphere.2009.01.043

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title = "Mechanism of heavy-metal removal by activated sludge",

abstract = "This paper investigates the chemical mechanisms operating in cadmium and lead removal by activatedsludge 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 properties 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.",

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author = "F. Pagnanelli and S. Mainelli and L. Bornoroni and D. Dionisi and L. Toro",

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T1 - Mechanism of heavy-metal removal by activated sludge

AU - Pagnanelli, F.

AU - Mainelli, S.

AU - Bornoroni, L.

AU - Dionisi, D.

AU - Toro, L.

PY - 2009/5

Y1 - 2009/5

N2 - This paper investigates the chemical mechanisms operating in cadmium and lead removal by activatedsludge 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 properties 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.

AB - This paper investigates the chemical mechanisms operating in cadmium and lead removal by activatedsludge 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 properties 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.

KW - bisorption

KW - heavy metals

KW - activated sludge

KW - potentiometric titration

KW - metal speciation

U2 - 10.1016/j.chemosphere.2009.01.043

DO - 10.1016/j.chemosphere.2009.01.043

M3 - Article

SN - 0045-6535

VL - 75

SP - 1028

EP - 1034

JO - Chemosphere

JF - Chemosphere

IS - 8

ER -

Mechanism of heavy-metal removal by activated sludge

Abstract

Keywords

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