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KSDeN(TM) 공정에 의한 질소, 인 제거에 있어서 수온, C/N비 및 C/P비의 영향
서인석 ( In Seok Seo ),김병군 ( Byung Goon Kim ),홍성택 ( Sung Taek Hong ),박철휘 ( Chul Hwi Park ),김도군 ( Do Gun Kim ),천상욱 ( Sang Ook Chun ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.6
In this study. the effects of temperature, C/N ratio and C/P ratio on the nutrients removal efficiencies of an intermittent aeration activated sludge process(KSDeN^TM process) were investigated with a pilot plant fed with the grit chamber effluent of `J` MWWTP. The effluent TCOD_Cr, and TBOD_5 were less than 10 mg/L, although the influent concentrations of organics and nutrients showed wide fluctuations. T-N removal efficiency and nitrification efficiency increased with increasing temperature and C/N ratio. The results of this study showed that the performance of KSDeN^TM process was more sensitive to the variation of temperature than that of C/N ratio, However, T-N removal efficiency was more than 60% at 10℃, and more than 70% at low C/N ratio of 3.0. T-P removal efficiency was more than 80% at C/P ratio of 30 or above, and it was higher at relatively low temperature and high C/P ratio (TCOD_Cr/T-P ratio), It is considered that the competition on organic compounds between PAOs and denitrifiers resulted in lowering T-P removal by activating nitrifiers with increasing temperature.
김도군,천상욱,김병군,서인석,박철휘,김성준,류수현 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4
Intermittent aeration processes have been much of interest as an excellent alternative for nutrients removal for upgrading secondary wastewater treatment plants, with minimum modification. Also, operational flexibility of those proposes a good opportunity for newly planed plants. Here, a pilot study was conducted to evaluate the performance of a continuous flow intermittent aeration process (KSDeN^TM process). The influent was collected at the effluent channel of the grit chamber of a large sewage treatment plant. The influent characteristics with standard deviation were 243.2±170.9mg/L for TCOD_cr, 47.5 13.9mg/L for T-N, 8.4±8.3mg/L for T-P and 5.2±1.8 for C/N ratio. Effluent of 1^st sedimentation tank was 208.2±87.6mg/L for TCOD_cr, 35.0±10.3mg/L for T-N, 4.8±1.9mg/L for T-P and 6.1±2.3 for C/N ratio. The average removal efficiencies of TCOD_cr, T-N and T-P were 93.6, 77.0 and 86.4% and effluent TCOD_cr, T-N and T-P concentrations were 12.5, 9.2 and 0.7mg/L respectively, satisfying regulatory limits. Alkalinity deficiency was not observed during the oxic periods, which is one of the special features of an intermittent aeration process. The results showed higher COD, T-N and T-P removal efficiencies and stability with varying influent conditions, compared to other conventional fixed phase nutrients removal processes.
KSDeNTM 공정에서 C/P 비, SRT, 온도 및 질산염 농도가 인 제거에 미치는 영향
김병군,서인석,홍성택,김도군,천상욱 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1
In this study, the effects of C/P ratio, SRT, temperature and nitrate concentration on the phosphorus removal efficiency of KSDeN™ 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 (TCOD_Cr/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 KSDeN™ 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 ㎎/L, the release of phosphorus was disturbed by denitrifiers. SCOD and PO^3-_4-P profile with each reactors of KSDeN™ process showed typical behavior of phosphorus release and luxury uptake by PAOs.