title: A comparative study of the treatment techniques for controlling THM-precursors in raw and drinking water.
abstract: Silica gel adsorption, strong base anion exchange IRA 400-OH form resin were evaluated for the treatment of trihalomethane precursors present in raw and drinking water. A powdered silica gel having 60 to 120 mesh size and a previously dried IRA 400-OH form resin having 20-50 mesh size have been applied to artificial water samples and a specific analytical approach was used for selective removal of humic acid present in the water. This study aims to evaluate the role of contact time, pH, adsorption dose, concentration of humic acid (H.A.), flow rate on the reduction of THM-precursors as a result of adsorption of H.A. while passing raw water through silica gel and IRA 400 OH form resin column. Freundlich adsorption isotherm constants K for silica gel and IRA 400-OH form resin were determined as 1.13 x 10(-3) and 4.2 x 10(-3) mg/g respectively and l/n were found to be 0.9927 and 1.069 respectively.
authors.affiliation: Inorganic Chemistry Division, Department of Chemistry, Institute of Science, 15, Madam Cama Road, Mumbai, India.
authors.forename: Vidyadhar B
authors.initials: VB
authors.lastname: Gawandi
authors.forename: A D
authors.initials: AD
authors.lastname: Sawant
mesh_terms: D000327:Adsorption; D000838:Anions; D002852:Chromatography, Ion Exchange / Q000379:methods; D006812:Humic Substances / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry; D013696:Temperature; D022882:Trihalomethanes / Q000032:analysis*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical; D014877:Water Pollution, Chemical; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: D000838:Anions; D006812:Humic Substances; D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; D014867:Water; D058428:Silica Gel; D012822:Silicon Dioxide