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Isotherm and Kinetics Modeling of Fluoride Removal from Industrial Effluent by Alumina
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Z. V. P. Murthy
Published/Copyright:
September 19, 2010
Fluoride contamination occurs in a wide range of industrial wastewater that has to be regulated from time to time. In the present study, wastewater from a polybutadiene rubber plant of Indian Petrochemicals Corporation Limited, Vadodara, Gujarat, India with a higher temperature, acidic pH and high level of fluoride concentration is treated with alumina. The contact time between the adsorbent and the adsorbate should be sufficient for the adsorption to be effective. Though synthetic resins have good adsorption capacity for the wastewater, they have some disadvantages; therefore, alumina has been tried. Properties of alumina, such as pH, bulk density, surface area, pore specific volume, and bulk crushing strength, have been found. Adsorption by alumina is found to be favorable. Five equilibrium adsorption isotherms, viz. Freundlich, Langmuir, Temkin, Harkins-Jura and Halsey, have been tested. It is found that the Halsey and Freundlich adsorption isotherms are fitting the data well. Four kinetic models, viz. Lagergren, pseudo-first-order, second-order, pseudo-second-order and Elovich have been used to find the rate constants. Out of the four kinetic models tested, the pseudo-second-order model fitted the data well in the present case. It is found that when the pH of the wastewater is acidic the adsorption capacity is high. It is also seen that as the temperature of the wastewater increases, the capacity of adsorption also increases.
Published Online: 2010-9-19
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
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