ADSORPTION OF HUMIC-ACID ON ALUMINUM HYDROXIDE FLAKES - INFLUENCE OF FLAKE SIZE AND ALUMINUM SALT

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: 1/ The size of the performed flocs is depending of the slow mixing time and of thc gradient velocity mixing values. 2/ The adsorption capacity depend of the size of the flocs 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.