Natural modified zeolite with cationic surfactant for the removal of anions in wastewater
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Abstract
Zeolites are known for their wide use in the removal of pollutants from industrial wastewater. This process occurs by the interaction of the cations present in the wastewater with the external and internal surfaces of the zeolite, through the cation exchange mechanism. However, this does not allow the elimination of anions, because the zeolite has a negative external surface charge, for this reason the objective of this work is to modify the external surface charge of the zeolite, with a cationic surfactant, for its application. in the removal of anions present in wastewater. Tasajeras zeolite modification tests were performed using benzalkonium chloride and the zeolite-surfactant product obtained was characterized by scanning electron microscopy (SEM). A residual from a phosphorus production factory was treated, with a total chromium content higher than that established by Cuban standard NC 27: 2012, using both natural and surfactant-modified zeolite, in order to establish a comparison. The results indicated that the surfactant-modified zeolite achieves the removal of the chromate anion, obtaining concentrations of total chromium in the residual, lower than the maximum permissible limits by the standard. When the residual was treated with the natural zeolite, no positive results were obtained.
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References
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