| Abstract |
| This study was conducted to evaluate and analyse the operational status of administrative data and filter media replacement in a full-scale wastewater treatment plant to which the bio-Filtration(BF) process was adopted as a main biological treatment process. Inflow rate was in the range of 37.2% to 47.4% of the design facility capacity, and the operational rate decreased significantly after the use of administrative data. The use of poly-aluminium chloride (PAC) as a flocculant resulted in a decrease of pH. Operational rate and effluent water quality were significantly affected by seasonal variation. After replacing the filter media, T-N removal was significantly improved with the stabilization of nitrification and denitrification processes, but T-P removal was found to be unstable due to a decrease in anaerobic condition, and the improvement of removal rate was found to be low. It was difficult to secure the stable effluent water quality during the winter season despite of periodic monitoring of various operational factors such as C/N ratio, C/P ratio, linear velocity (LV), and empty bed contact time (EBCT). Effluent water quality parameters such as SS, T-P, and BOD were repeatedly affected by the variation of inflow rate, and it was found that LV and EBCT played an important role in BF process. |
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| Key Words |
| Bio-filtration process, Step feed, Effluent water quality, Process improvement, 생물여과 공정, 유입수 분할 주입, 방류수질, 공정 개선 |
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