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Ultrasonic irradiaton of the removal of linear alkylbenzena sulphonates (LAS) from wastewater

Abu Hassan , Mohd. Ariffin and Mantzavinos, Dionissios and Metcalfe, Ian S. (2007) Ultrasonic irradiaton of the removal of linear alkylbenzena sulphonates (LAS) from wastewater. Jurnal Teknologi , 46 (F). pp. 27-40. ISSN 0217-9696 (Print); 2180-3722 (Electronics)

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Abstract

The effect of low frequency (20 kHz) ultrasonic irradiation on the removal of sodium Linear Alkylbenzene Sulphonates (LAS) from aqueous solutions has been investigated. Sonication of three different initial concentrations of LAS, 500 μgmol/l, 750 μgmol/l and 1000 μgmol/l, were performed. All experiments used a temperature of 30°C, frequency of 20 kHz, power of 125 W, a batch time of 120 min and the pH was left uncontrolled. It was found that the main degradation of LAS at micromolar concentrations proceeded via a reaction with OH· radicals. The initial degradation rate increased with an increase in the surfactant concentration over the whole concentration range studied. The sonolysis of LAS showed a strong inhibition of H2O2 production at a higher concentration. Sonication of LAS in the presence of Br¯ suggested that OH· radicals induced degradation pathway was the dominating sonochemical degradation mechanism.

Item Type:Article
Uncontrolled Keywords:surfactants, ultrasonic, wastewater, total organic carbon (TOC)
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:8107
Deposited By: Norshiela Buyamin
Deposited On:27 Mar 2009 03:33
Last Modified:02 Jan 2014 07:02

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