REMOVAL OF HUMIC ACID BY THE COMBINATION ALUMINIUM SULPHATE / ACTIVATED BENTONITE
Journal Title: Larhyss Journal - Year 2017, Vol 30, Issue 30
Abstract
This work presents removal of humic substances by the combination of aluminum sulphate/activated bentonite during coagulation-flocculation in waters with various mineralizations. Many reaction parameters (pH, coagulant or adsorbent dosage, initial concentration of humic acid, ionic strength…) were varied during trials. In distilled water, the use of the coagulant alone results in increased removal efficiencies and aluminum sulfate doses, with increasing initial concentration of humic substances. The combination of aluminum sulphate and activated bentonite revealed that at lower doses there is better removal of humic acid, especially when the adsorbent reagent is introduced during slow stirring. Moreover, at pH = 7, when the activated bentonite is introduced during rapid stirring, the trend of the curves is very similar to that of the flocculation tests in the exclusive presence of aluminum sulphate. The evolution of humic substances in the combination tests in mineralized media showed that the activated bentonite required doses are higher but the maximum yields are lower than in distilled water.
Authors and Affiliations
REZEG A. | Département de Génie Civil et d’Hydraulique Faculté des Sciences et de Technologie, Université de Biskra, Algérie, ACHOUR S. | Laboratoire LARHYSS, Université de Biskra, Algérie
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