KSDeNTM 공정에서 C/P 비, SRT, 온도 및 질산염 농도가인 제거에 미치는 영향 = Effects of C/P ratio, SRT, Temperature and Nitrate Concentration on Phosphorus Removal in KSDeNTM Process

다국어 초록 (Multilingual Abstract)

In this study, the effects of C/P ratio, SRT, temperature and nitrate concentration on the phosphorus removal efficiency of KSDeNTM process(KOWACO-Ssangyong DeNutrient process) was investigated with a pilot plant, which is fed with the grit chamber effluent of 'J' MWWTP(Municipal Wastewater Treatment Process).During the operating period, T-P removal efficiency was more than 80 % at C/P ratio(TCODCr/T-P ratio) of 35 or above, and it was higher at relatively low temperature and high C/P ratio. At SRT(Sludge Retention Time)'s of 3 - 28 days, phosphorus removal efficiency increased up to 90 % until the SRT reached 20 days. The phosphorus removal efficiency decreased rapidly with more than 20 days of SRT, which showed that the optimal SRT is 20 days for the T-P removal of KSDeNTM process.Effluent T-P concentration increased with increasing temperature. It is considered that the competition on organic compounds between PAOs(Phosphorus Accumulating Organisms) and denitrifiers resulted in lowering T-P removal by activating nitrifiers at 15 or above. The release of phosphorus was influenced by nitrate concentration in anaerobic/anoxic tank. When the nitrate concentration was higher than 2 mg/L, the release of phosphorus was disturbed by denitrifiers.SCOD and PO43--P profile with each reactors of KSDeNTM process showed typical behavior of phosphorus release and luxury uptake by PAOs.