Sludge of wastewater treatment plants as Co2+ ions sorbent
-
Vladimír Frišták
,
Martin Pipiška
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.
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© 2012 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Content of selected secondary metabolites in wild hop
- Continuous sorption of synthetic dyes on dried biomass of microalga Chlorella pyrenoidosa
- Sludge of wastewater treatment plants as Co2+ ions sorbent
- Effect of animal age and gender on fatty acid and elemental composition in Austrian beef applicable for authentication purposes
- Nutritional, antioxidant, and glycaemic characteristics of new functional bread
- Effects of enzymes and hydrocolloids on physical, sensory, and shelf-life properties of wheat bread
- Magnetic chains formed from tetra-coordinate Co(II) complexes
- Prediction of anti-tuberculosis activity of 3-phenyl-2H-1,3-benzoxazine-2,4(3H)-dione derivatives
- Experimental investigation of bubble and drop formation at submerged orifices
- Cadmium concentration stabilization in a continuous sulfate reducing bioreactor via sulfide concentration control
- Facile synthesis of gemini surface-active ATRP initiator and its use in soap-free AGET ATRP mini-emulsion polymerisation
- Bulgarian natural diatomites: modification and characterization
- Synthesis, characterisation, and DC conductivity of polyaniline-lead oxide composites
