Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection

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  • Article
    Citation - WoS: 14
    Citation - Scopus: 15
    Neutralization of an Extremely Acidic Sludge and Stabilization of Heavy Metals in Flyash Aggregates
    (Elsevier Ltd., 2007) Polat, Mehmet; Güler, Erkan; Lederman, Eli; Cohen, Haim
    An extremely acidic, heavy metal-rich sludge (pH = -1.2) was scrubbed with a Class-F fly ash in order to simultaneously neutralize the acidity and stabilize the heavy metals contained in both wastes. This paper outlines the leaching behavior of the aggregate material generated by scrubbing. For proper fly ash/sludge ratios, the fly ash acted as an outstanding neutralizer for the acidic waste. Leaching of heavy metals from the aggregate samples was below the environmental limits within a pH range between 3 and 9. Subsequent washing of the leached aggregate with acidic CALWET solutions did not result in an additional release of heavy metals. It is proposed that coordinative bonding of the metal cations onto neutral surface sites and electrostatic adsorption led to stabilization of the heavy metals within the aggregate structure below hydrolysis pHs.
  • Article
    Citation - WoS: 259
    Citation - Scopus: 284
    Heavy Metal Removal From Waste Waters by Ion Flotation
    (Elsevier Ltd., 2007) Polat, Hürriyet; Erdoğan, D.
    Flotation studies were carried out to investigate the removal of heavy metals such as copper (II), zinc (II), chromium (III) and silver (I) from waste waters. Various parameters such as pH, collector and frother concentrations and airflow rate were tested to determine the optimum flotation conditions. Sodium dodecyl sulfate and hexadecyltrimethyl ammonium bromide were used as collectors. Ethanol and methyl isobutyl carbinol (MIBC) were used as frothers. Metal removal reached about 74% under optimum conditions at low pH. At basic pH it became as high as 90%, probably due to the contribution from the flotation of metal precipitates.