| Title |
Effects of Coagulation on Adsorptive Capacity of Powdered Activated Carbon |
| Authors |
김창수(Chang Soo Kim),최승일(Suing Il Choi),이기창(Gi Chang Lee) |
| Abstract |
As the raw water quality has been deteriorated, the use of powdered activated carbon has been prevailed. However, it is pointed out that the adsorptive capacity of powdered activated carbon is confined since coagulant is added just after the injection of powdered activated carbon. The objectives of this study are to investigate the effect of coagulation on the adsorption capacity of powered activated carbon and to investigate whether the optimum dosage of coagulant changes because of the powdered activated carbon injection. The sodium dodecyl benzene sulfonate (SDBS), fenitrothion, phenol, chloroform have been used as adsorbates and polyaluminum chloride (PAC) has been used as a coagulant. The result shows that the optimum coagulant dosage has little been changed due to the addition of powdered activated carbon. When only powdered activated carbon is added to the raw water, the residual concentrations of adsorbates have been reduced gradually for 20∼30 minutes. However, when coagulant is added just after the injection of powdered activated carbon, the residual concentrations of adsorbates are flattened within a few minutes indicating no more adsorption. The amounts of adsorbates removed by the simultaneous use of powdered activated carbon and coagulant are less than the sum of removals by each treatment. Therefore, it has been concluded that the floc formation by addition of coagulant has confined the adsorptive capacity of powdered activated carbon, though its effects are different with various adsorbates. |