engleski

Phosphate removal from wastewater by bacteria and organic bentonite

The aim of this study was to determine the potential of phosphate (P) removal from wastewater by P-accumulating bacteria and 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. The 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 the P was efficiently removed from wastewater by combined adsorption and bacterial uptake in the biomass. The organic bentonite samples with higher CTA loading (from 55 to 175% of the CEC) showed the bactericidal effect. To enhance the P removal from wastewater in the aerated biological system, the organic bentonite can be used, but the special attention should be given to the configuration and location of sorbed CTA molecules and its potential desorption.

bentonite ; bacteria ; wastewater

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