| Microcontaminants included nonbiodegradable organic carbon(NBDOC) remain in the effluent of conventional water treatment plant, which consists of prechlorination, coagulation and flocculation, sedimentation, rapid sand filter processes, which is used the Nakdong river water as raw water. In order to improve the operating conditions of biological activated carbon (BAC) bed for high-rate microcontaminants removal from the filtrated water of rapid sand filter, granular activated carbon(GAC) or biological activated carbon(BAC) of ozonation plus GAC with adsorption and biodegradable processes have been introduced to the existing water treatment plant. The objectives of this research, therefore, is to investigate and evaluate the characteristics of the BAC processes based on the results of turbidity, heavey metals, total organic carbon(TOC), UV-254㎚ absorbance(UV254), and trihalomethanes(THMs) removals. The results of this research show that the bed depth of BAC was needed more than 320 ㎝. The retention time of 6 minutes in ozone contactor for summer with ozone dosage of 0.15㎎/L and winter with ozone dosage of 0.25㎎/L could be no affect for microorganism in the BAC bed. The removal percentage of the BAC process averaged 54% for Fe, 80% for Mn, and 44% for turbidity. The BAC bed reduced in the range of 30 to 50% of biodegradable DOC(BDOC). |
|
PDF
