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Removal of Cd(II) from aqueous solutions using clarified sludge.

T K Naiya¹, A K Bhattacharya, S K Das

¹Department of Chemical Engineering, University of Calcutta, Kolkata 700 009, India.

Journal of Colloid and Interface Science

|June 24, 2008

Summary

This study demonstrates that steelmaking clarified sludge effectively removes cadmium (Cd(II)) from wastewater. The process is spontaneous, exothermic, and chemical, offering a cost-effective solution for industrial effluent treatment.

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Area of Science:

Environmental Science
Materials Science
Chemical Engineering

Background:

Clarified sludge is a significant waste product from steel manufacturing.
Industrial applications of clarified sludge include road construction and land filtration.

Purpose of the Study:

To characterize clarified sludge for its potential use in removing cadmium (Cd(II)) from aqueous solutions.
To investigate the adsorption mechanism and optimize conditions for Cd(II) removal.

Main Methods:

Batch adsorption experiments were conducted to study the effects of pH, adsorbent dosage, adsorbate concentration, contact time, and temperature.
Adsorption kinetics, isotherms, thermodynamics, and mass transfer were analyzed.
Desorption and application studies were performed for economic evaluation.

Main Results:

The adsorption process followed pseudo-second order kinetics and was best described by the Langmuir isotherm model.
Maximum Cd(II) uptake was 36.23 mg/g, with solution pH identified as the primary influencing factor.
Thermodynamic studies indicated a spontaneous and exothermic adsorption process, suggesting a chemical nature.

Conclusions:

Steelmaking clarified sludge is a viable and cost-effective adsorbent for removing Cd(II) from industrial wastewater.
The adsorption mechanism involves chemical interactions, and process conditions can be optimized for efficient treatment.
This approach offers a sustainable waste management strategy for the steel industry.