Chromate Removal from Water Using Surfactant-Enhanced Crossflow Filtration
- 1 July 1997
- journal article
- research article
- Published by Taylor & Francis in Separation Science and Technology
- Vol. 32 (11), 1899-1920
- https://doi.org/10.1080/01496399708000744
Abstract
Removal of chromate from water was investigated using the surfactant enhanced crossflow filtration technique in which the cationic surfactant, cetyl trimethylammonium bromide (CTAB), was the carrier for the metal ions. The variation of chromate and surfactant rejections, and permeate flux with time were measured as a function of CTAB/chromate concentration ratio, while maintaining a constant transmembrane pressure drop, membrane pore size, and pH of the feed solution. The method was found to be effective in removing chromate from water. It was observed that the efficiency of chromate removal increased with increasing CTAB/ chromate ratio. It was also found that the chromate concentration had a significant effect on the CTAB concentration in the permeate and on the time taken to establish the secondary membrane which consists of a highly viscous surfactant phase in the hexagonal state in the absence of chromate. In the presence of chromate, permeate flux increased at the same CTAB concentration although the surfactant and chromate rejections decreased, indicating lowering of the secondary membrane resistance to permeate flow. These conclusions were confirmed by deadend filtration experiments which showed that the fouling index decreased by the addition of chromate while the opposite was valid when sodium chloride was present in the surfactant/water/electrolyte ternary system.Keywords
This publication has 12 references indexed in Scilit:
- Concentration and fractionation of polyvinyl alcohol-anionic surfactant stabilised latex dispersions by microfiltrationJournal of Membrane Science, 1995
- Cross‐flow ultrafiltration of micellar surfactant solutionsAIChE Journal, 1995
- Crossflow microfiltration behaviour of a double-chain cationic surfactant dispersion in water—I. The effect of process and membrane characteristics on permeate flux and surfactant rejectionChemical Engineering Science, 1994
- Flow induced phase inversion agglomeration: Fundamentals and batch processingPolymer Engineering & Science, 1994
- Flux decay and rejection during micro- and ultra-filtration of hydrophobically modified water-soluble polymersJournal of Membrane Science, 1994
- Removal of Divalent Metal Cations and Their Mixtures from Aqueous Streams Using Micellar-Enhanced UltrafiltrationSeparation Science and Technology, 1994
- Mechanisms of permeate flux decay, solute rejection and concentration polarisation in crossflow filtration of a double chain ionic surfactant dispersionJournal of Membrane Science, 1994
- Micellar‐enhanced ultrafiltration of chromate anion from aqueous streamsAIChE Journal, 1988
- Ultrafiltration Characteristics of Oil-Detergent-Water Systems: Membrane Fouling MechanismsSeparation Science and Technology, 1979
- Influence of Electrolyte on Phase Equilibria and Phase Structure in the Binary System of Di-2-Ethylhexyl Sulphosuccinate and WaterPublished by American Chemical Society (ACS) ,1975