The Nutrient Removal of Mixed Wastewater composed of Sewage and Stable Wastewater using SBR

SBR을 이용한 하수와 우사폐수로 구성된 혼합폐수의 영양소 제거

  • 김홍태 (경북대학교 토목공학과)
  • Published : 1999.10.01


This study was carried out to obtain the optimal operating parameter on organic matters and nutrient removal of mixed wastewater which was composed of sewage and stable wastewater using SBR. A laboratory scale SBR was operated with An/Ae(Anaerobic/Aerobic) ratio of 3/3, 2/4 and 4/2(3.5/2.5) at organic loading rate of 0.14 to 0.27 kgBOD/$m^3$/d. TCOD/SCOD ratio of mixed wastewater was 3, so the important operating factor depended upon the resolving the particulate parts of wastewater. Conclusions of this study were as follows: 1) For mixed wastewater, BOD and COD removal efficiencies were 93-96% and 85-89%, respectively. It was not related to each organic loading rate, whereas depended on An/Ae ratio. During Anarobic period, the amount of SCOD consumption was very little, because ICOD in influent was converted to SCOD by hydrolysis of insoluble matter. 2) T-N removal efficiencies of mixed wastewater were 55-62% for Exp. 1, 66-76% for Exp. 2, and 67-81% for Exp. 3, respectively. It was found that nitrification rate was increased according to organic concentration in influent increased. Therefore, the nitrification rate seemed to be achieved by heterotrophs. During anoxic period, denitrification rate depended on SCOD concentration in aerobic period and thus, was not resulted by endogenous denitrification. However, the amount of denitrification during anaerobic period were 3.5-14.1 mg/cycle, and that of BOD consumed were 10-40 mg/cycle. 3) For P removal of mixed wastewater, EBPR appeared only Mode 3($3^*$). It was found that the time in which ICOD was converted to VFA should be sufficient. For mode 3 in each Exp., P removal efficiencies were 74, 87, and 81%, respectively. But for 45-48 of COD/TP ratio in influent, P concentration in effluent was over 1 mg/L. It was caused to a large amount of ICOD in influent. However, as P concnetration in influent was increased, the amounts of P release and uptake were increased linearly.


stable wastewater;mixed wastewater;anaerobic(An)/aerobic(Ae) ratio;nitrification;denitrification;EBPR


  1. Proceeding of the Water Quality International 1998 - IAWQ, 19th Biennial International Conference - v.V1 The Effect of the Influent COD/TP ratio upon the performance of Biological Nutrient Removal Processes Punrattanasin, W.;C.W. Randall
  2. Water Research v.27 no.3 Influence of DO and ORP on Phosphate Release and Uptake by Activated Sludge from Sewage Plants with EBPR Schon, G.;S. Gfywitz;F. Mertens
  3. Standard Methods for the Examination of Water and Wastewater(19th Ed.) Eaton, A.D.;L.S. Clesceri;A.E. Greenberg
  4. Water Quality Management Library v.5 Design and Retrofit of Wastewater Treatment Plants for Biological Nutrient Removal Randall, C.W.;J.L. Barnard;H.D. Stensel
  5. Wat. Sci. Tech. v.25 no.6 Process Modelling of Nitrification-Denitrification Excess Phosphorus Removal Systems.-a review Wentzel, M.C.;G.A. Ekama;G.v.R. Marais
  6. Theory Design and Operation of Nutrient Removal Activated Sludge Processes Biological Nitrogen Removal Ekama, G.A.;G.v.R. Marais