title: The effect of metal ions on humic acid removal and permeation properties in an ultrafiltration system.
abstract: With a view to improving the removal of humic acid from aqueous solution, the effect of metal ion addition on the separation of humic acid from water in an utrafiltration (UF) system was investigated. The valence of the metal ion and the molar ratio of humic acid to metal ion strongly affected the permeation flux during ultrafiltration. It was found that the ionic strength, dissociation constant and operating pressure were not major factors affecting the separation performance of the ultrafiltration process. As well as indicating that a suitable ratio of humic acid to metal ion and valence of metal ion were the key factors in improving separation efficiency. The results also showed that separation of humic acid depended on the level of formation of humic acid-metal ion complexes, and on the degree of fouling on the membrane surface.
authors.affiliation: Department of Environmental Engineering and Health, Chia-Nan University of Pharmacy and Science, Tainan, Taiwan, ROC.
authors.forename: Ching-Shan
authors.initials: CS
authors.lastname: Hsu
authors.forename: Shih-Hsiung
authors.initials: SH
authors.lastname: Chen
authors.forename: Rey-May
authors.initials: RM
authors.lastname: Liou
authors.forename: Mu-Ya
authors.initials: MY
authors.lastname: Hung
authors.forename: Kuang-Chang
authors.initials: KC
authors.lastname: Yu
mesh_terms: D005374:Filtration; D006812:Humic Substances / Q000302:isolation & purification*; D007477:Ions; D008567:Membranes, Artificial; D008670:Metals / Q000737:chemistry; D010539:Permeability; D018508:Water Purification / Q000379:methods*
chemical_list: D006812:Humic Substances; D007477:Ions; D008567:Membranes, Artificial; D008670:Metals