title: Laboratory study on metal attenuation capacity of fine grained soil near ash pond site.
abstract: Waste settling tanks of earthen containment nature are common in India for disposal of solid waste in slurry form. For a large pond system, e.g. ash slurry disposal tank of coal base thermal power plant, leachate generation and its migration pose a serious problem. A natural attenuation of controlling the migratory leachate is to use locally available clay material as lining system due to the adsorption properties of soil for reducing some metallic ions. The present investigation was carried out to explore the Ni2+ and Cr6+ removal capacity of surrounding soil of the ash pond site of Super Thermal Power Plant in West Bengal, India through some laboratory scale and field studies. The soil and water samples collected from the site showed the existence of Ni2+ and Cr6+ in excess to permissible limit. A two-dimensional adsorption behaviour of these pollutants through soil was assessed. The results showed that more than 80% of nickel and 72% of chromium were found to be sorbed by the soil corresponding to initial concentrations of two ions, i.e. 1.366 mg/L and 0.76 mg/L respectively. The batch adsorption data are tested Langmuir and Freundlich isotherm models and found reasonably fit. Breakthrough adsorption study uptake also showed a good adsorption capacity of the soil. The experimental results found to fit well with the existing two dimensional (2D) mathematical models as proposed by Fetter (1999).
authors.affiliation: Department of Civil Engineering, Jadavpur University, Kolkata-700 032, India.
authors.forename: Sudipta
authors.initials: S
authors.lastname: Ghosh
authors.forename: Somnath
authors.initials: S
authors.lastname: Mukherjee
authors.forename: Sujoy
authors.initials: S
authors.lastname: Sarkar
authors.forename: Sunil
authors.initials: S
authors.lastname: Kumar
mesh_terms: D005618:Fresh Water / Q000032:analysis / Q000737:chemistry*; D008670:Metals / Q000737:chemistry* / Q000302:isolation & purification*; D012987:Soil / Q000032:analysis*; D014462:Ultrafiltration / Q000379:methods*; D018707:Volcanic Eruptions / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D008670:Metals; D012987:Soil; D014874:Water Pollutants, Chemical