Abstract
Abstract The purpose of this study is to show that the ability of prebuilt aluminium hydroxide flocs to adsorb humic acids is function of experimental jartest conditions. The results indicate that : I/ The size of the preformed flocs is depending of the slow mixing time and of the gradient velocity mixing values. 2/ The adsorption capacity depend of the size of the floes showing that the electrostatic and ionic exchange mechanisms are mainly effective at the area of the adsorbent material. The efficiency of aluminium salts to remove humic acids are, in decrease order : WAC, aluminium sulphate, aluminium chloride, aluminium nitrate.
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