Powdered bentonite organoclay was used to remove oil from water in this study. The oil-in-water emulsions used were standard mineral oil (SMO), Kutwell45 (KUT45), and Valcool (VAL) (two cutting oils), refinery effluent (RE), and produced water (PW) from production wells at Estevan, Saskatchewan. The concentrations of oil in oily waters varied from 26to381mg∕L. Batch studies showed that the equilibrium time for the sorption of oil by organoclay was less than 1h for all emulsions. Results clearly indicated that Lagergren’s pseudo first-order and Ho’s pseudo second-order equations modeled well the kinetics of sorption of oil by the organoclay. Batch adsorption experiments showed that in general the most appropriate isotherm for SMO, KUT45, and PW sorption by organoclay was the Freundlich model. The Langmuir and BET isotherms fitted well the sorption data for VAL and RE, respectively. The results showed that organoclay was an excellent medium for treating oily waters.
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Moazed et al. (2005) studied this question.
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