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Lead biosorption using a dairy sludge--thermodynamic study and competition effects.

M Sassi, E Guibal, B Bestani

Water Environment Research : a Research Publication of the Water Environment Federation

|March 13, 2014

Summary

Dairy sludge effectively adsorbs lead ions from water. Increasing temperature boosts lead removal, with the Langmuir model best describing the adsorption process for this sustainable biosorbent.

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Area of Science:

Environmental Science
Materials Science
Chemical Engineering

Background:

Heavy metal contamination, particularly lead (Pb+2), poses significant risks to aquatic ecosystems and human health.
Effective and economical methods for removing lead ions from industrial wastewater are crucial for environmental protection.

Purpose of the Study:

To investigate the potential of local dairy sludge as a low-cost biosorbent for lead ion adsorption from aqueous solutions.
To optimize adsorption conditions and evaluate the performance of dairy sludge under varying experimental parameters.

Main Methods:

Batch adsorption experiments were conducted to determine the effects of temperature, initial lead concentration, and ionic strength on lead uptake.
Adsorption equilibrium data were fitted using Langmuir and Freundlich isotherm models.
Brunauer-Emett-Teller (BET) and Fourier transform infrared (FTIR) analyses were employed for biosorbent characterization.

Main Results:

Lead ion adsorption capacity increased from 149 to 224 mg/g with a temperature rise at pH 5.
The Langmuir isotherm model provided the best fit for the experimental adsorption data.
Ionic strength variations showed minimal impact on lead sorption, except for a 20% decrease with CaCl2. Binary systems with Cd+2 ions had a limited effect on lead sorption.

Conclusions:

Local dairy sludge demonstrates significant potential as an effective and affordable biosorbent for lead removal from wastewater.
The findings suggest dairy sludge as a viable alternative to commercial adsorbents for industrial effluent treatment.