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Chemical Papers

, Volume 67, Issue 3, pp 265–273 | Cite as

Sludge of wastewater treatment plants as Co2+ ions sorbent

  • Vladimír FrištákEmail author
  • Martin Pipiška
  • Miroslav Horník
  • Jozef Augustín
  • Juraj Lesný
Original Paper

Abstract

Sludges produced in huge amounts by wastewater treatment plants (WWTP) display high fertility properties; however, the presence of heavy metals restricts their use for agricultural purposes. Sorption capacity of sludge is generally much higher and it can also be considered as a cheap sorbent of heavy metals. The paper describes cobalt sorption by dried activated sludge (DAS) obtained from the aerobic phase of a WWTP. DAS was characterized by FT-IR spectroscopy, cation exchange capacity (CEC), and atomic absorption spectrometry (AAS) analysis. Sorption capacity of DAS (Q eq) increased with the initial concentration (C 0) of Co2+ (CoCl2) within the range from 100 μmol g−1 to 4000 μmol g−1, reaching 15 μmol g−1 and 200 μmol g−1, respectively. The maximum uptake capacity (Q max) at pH 6.0 calculated from the Langmuir isotherm model was (256 ± 9) μmol g−1 for Co2+ ions. Obtained Q values were dependent on pH within the range from 3.0 to 7.0. Competitive effect of other bivalent cations such as Ni2+ in Co2+ sorption equilibrium was confirmed; which is in agreement with the hypothesis of the decisive role of ion-exchange mechanism in metal sorption. The obtained data are discussed from the point of view of potential utilization of sludges as sorbents, i.e. in non-agricultural application.

Keywords

activated sludge sorption cobalt chemical modification cation exchange capacity 

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2012

Authors and Affiliations

  • Vladimír Frišták
    • 1
    Email author
  • Martin Pipiška
    • 1
  • Miroslav Horník
    • 1
  • Jozef Augustín
    • 1
  • Juraj Lesný
    • 1
  1. 1.Department of Ecochemistry and RadioecologyUniversity of Ss. Cyril and Methodius in TrnavaTrnavaSlovakia

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