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Open Life Sciences

formerly Central European Journal of Biology

Editor-in-Chief: Ratajczak, Mariusz

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Volume 4, Issue 3


Volume 10 (2015)

Biosorption of phosphate from synthetic wastewater by biosolids

Jasna Hrenovic / Mirela Rozic / Tomislav Ivankovic / Anamarija Farkas
Published Online: 2009-07-26 | DOI: https://doi.org/10.2478/s11535-009-0030-4


The aim of this study was to determine the potential of phosphate (P) removal from wastewater by biosolids prepared by the immobilization of P-accumulating bacteria onto organic bentonite. Organic bentonite was prepared by treating bentonite clay with quaternary ammonium salt — cetyltrimetylammonium (CTA) bromide. Cation exchange capacity (CEC) of the bentonite was found to be 179.0 meq/100 g of the dry bentonite. The CTA occupied ca. 175% of the CEC. Modification of bentonite with CTA in amounts higher than 55% of the CEC resulted in the change of zeta potential of particles from negative to positive. Only in reactors containing organic bentonite samples occupied with 3.5 and 28% of the CEC was P efficiently removed from wastewater by combined adsorption and bacterial uptake in the biomass. Organic bentonite samples with higher CTA loadings (from 55 to 175% of the CEC) showed bactericidal effects. To enhance P removal from wastewater in the aerated biological system, biosolids consisting of P-accumulating bacteria and organic bentonite can be used, but special attention should be given to the configuration of sorbed CTA molecules and its potential desorption.

Keywords: Bacteria; Bentonite; Biosolids; Phosphate; Wastewater

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About the article

Published Online: 2009-07-26

Published in Print: 2009-09-01

Citation Information: Open Life Sciences, Volume 4, Issue 3, Pages 397–403, ISSN (Online) 2391-5412, DOI: https://doi.org/10.2478/s11535-009-0030-4.

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© 2009 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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