Abstract
The effect of CaO, Na2SiO3, Al(OH)3, Al2(SO4)3, and CaCl2 on the surface charge and the diffuse double layer (DDL) thickness of a natural tropical peat were investigated in this study. Consequently, the flocculation and coagulation behavior of peat colloids were studied. As result, the thickness of DDL were changed significantly due to the addition of each electrolytes. The compression of the DDL thickness causes a weaker electrostatic repulsion and therefore a higher settlement rate. The surface charge of pure peat was almost zero at pH 3.2. The pH at the isoelectric point was increased by increasing the electrolyte concentration. The resulted flocculation and coagulation behavior of suspended peat in cationic reagents was in contrary with the surface electrical charge characteristics where the Na2SiO3 and the Al2(SO4)3 electrolytes showed the lowest and highest settlement rate, respectively.
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