| Direct-purification is a process that employs self-purification of stream to improve the water quality. The process is manageable economically and easily because it is based upon the characteristics of the stream. Therefore, the process employes the full characteristics of the stream and shows high efficiency of treatment. Due to the above advantages, the process has been studied extensively. This study was the treatment of stream conducted on the contact oxidation process. The contact oxidation process is one of the direct-purification process. The reactor was designed and made for this study. In the treatment, the removal efficiency was studied with the change of the media at constant HRT. The studied media were waste concrete, cement and gravel, sandbag, scrubber, waste plastic bottle, and gravel. The reactor was operated at 90 minutes of HRT to maintain the constant operation condition. BOD and SS were measured before and after the treatment. The decrease of BOD for gravel and scrubber media (76.9% and 73.5% respectively) showed higher than those of other media. The change of SS for gravel and scrubber media showed same tendency. The decrease of BOD for waste plastic bottle and sandbag (68.9% and 68.0% respectively) also showed favorable efficiencies. |
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