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Articles by Raid S.A. Shatat
Total Records ( 1 ) for Raid S.A. Shatat
  A. Ariffin , Raid S.A. Shatat , A.R. Nik Norulaini and A.K. Mohd Omar
  Five cationic polyacrylamides of varying molecular weights but similar charge density were synthesized using free radical polymerization and Mannich reaction, characterized by different methods (infra red (IR) spectroscopy, differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), viscosity measurements and conductometric titration) and applied as flocculants to palm oil mill effluents (POME). Flocculent performance was assessed by determining the polyelectrolyte dosage and the removal efficiency of the resulting supernatants using turbidity, suspended solids (SS) and chemical oxygen demand (COD) as indicators. It was found that varying in the molecular weight of the cationic polyacrylamide from 20X103 to 1.5X106 g mol-1 affects flocculent performance significantly. Polyelectrolyte adsorption increased as the molecular weight of the polyelectrolyte increased. High molecular weight cationic polyacrylamide (1.5X106 g mol-1) is the most effective polymer as it obtains a high removal efficiency (%) with a dosage as low as 60 mg L-1 at pH 3 of POME. The very high molecular weight cationic polyacrylamide (over 5 million g mol-1) produced very poor floc formation this is because polyelectrolytes having very high molecular weights do not dissolve readily but tend to form gel lumps.
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