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Lead Biosorption Using a Dairy Sludge—Thermodynamic Study and Competition Effects

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Local diary sludge as a biosorbent was used in this study for lead ion adsorption from aqueous solution. Batch experiments were carried out as a function of temperature, initial concentration, and ionic strength. Lead uptake was significantly enhanced from 149 to 224 mg/g of dairy sludge by a temperature increase at pH 5. Equilibrium data for metal ion adsorption were analyzed using model equations, namely Langmuir and Freundlich isotherms, and the best fit to the experimental data was provided by the first isotherm model. Brunauer‐Emett‐Teller and Fourier transform infrared analyses were also performed to characterize the biosorbent. Ionic strength using NaCl, NaNO3, and Ca(NO3)2 did not affect Pb+2 sorption, while there was a 20% decrease using CaCl2. A limited effect of Cd+2 ions present in the binary system on lead sorption was observed. This study shows that this local dairy sludge can be an alternative to the commercially available adsorbents for the removal of heavy metals from liquid effluents.

Keywords: competition effects; dairy sludge; heavy metals; isotherms; sorption

Document Type: Research Article


Affiliations: Agro-Biotechnology and Nutrition Research Laboratory in Semi Arid Zone Ibn Khaldoun University – Tiaret BP 78 Zaaroura – 14000 Tiaret, Algeria

Publication date: 2014-01-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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