Browsing by Author "Shailaja, K."

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    Characterization of zero valent iron used for nitrate removal in drinking water
    (Uva Wellassa University of Sri Lanka, 2015) Shailaja, K.; Weerasooriya, R.
    Nitrogen is one of the important pollutants present in drinking water are runoff from fertilizer use; leaking from septic tanks, sewage; and erosion of natural deposits. When nitrate is absorbed in to blood hemoglobin is converted to methemoglobin. Methemoglobin does not carry oxygen efficiently. This results in reduced oxygen supply to vital tissues such as the brain. Severe methemoglobinemia (blue baby syndrome) can result in brain damage and death. In recent years, considerable efforts have been made to remove nitrate in water. The use of zero valent iron to remove nitrate from water represents one of the latest innovative methods in the reducing .process. The major reduction product was ammonia. Zero valent iron in contrast with iron powder have some advantages of specific surface area, high active surface, which lead to a increased denitrification rate of nitrate. Materials and Methods Surface titrations Surface titration was carried out as a function of the concentration of NaCl to determine pH zpc(Point of Zero net proton Charge).Prior to commencement of a titration 10.0g/l zero valent iron was NaNO3) strength. The initial pH value is around 10.0 after equilibration by adding 0.101 mol dm NaOH .Then, surface titration was started from pH 10.0 to 3.0 while bubbling with N2 gas to prevent any interference from atmospheric CO2. All titrations were carried out in thermostatic bath at 25.0 °C. At each titration point the data versus HCl) were measured by an auto titratior. A reverse base titration with 0.101 mol dm NaOH was performed to return the suspension to the original starting pH under same experimental conditions. This titration was repeated for three different ionic strength NaCl).However, only the acid titration data were considered for the analysis.These data unit for surface charge density was calculated.