Sewage Treatment Using a Modified DNR Process

수정 DNR 공정을 이용한 하수처리

Choi, Jin-Taek;Nam, Se-Yong

  • Published : 2008.12.31


In this study, the removal characteristics of organic components and nutrients of sewage taken from the Suwon area were investigated in a lab-scale modified DNR (Daewoo Nutrient Removal) process. The modified DNR process consisted of a sludge denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary anoxic tank and a secondary aerobic tank. The proposed process with the average C/N ratio of 3.5 was performed for the sewage treatment. The results were compared with other existing DNR processes. The organic fractions in sewage were analyzed by measuring the oxygen uptake rate. The resulting removal efficiencies of SS, BOD, COD, TN and TP were 93.1%, 95.5%, 86.1%, 67.8% and 80.6%, respectively.


a modified DNR;sewage;organic fractions;biological nutrient removal


  1. Park, Y. S., Jeong, N. S. and Kim, D. S. : A comparison of nutrients removal characteristics by the variation of organics in A2O SBR and A2O SBBR for the small sewerage system. Korean Journal of Environmental Health, 32(5), 451-461, 2006
  2. Ministry of Environment : Standard Methods for the Test and Examination of Water Quality, 2004
  3. APHA, WEF & AWWA : Standard methods for the examination of water and wastewater, 21th Edition, Washington, D.C., 2005
  4. Kim, H. S. : Quality of water analyses and experiment, Donghwatechnology Publishing Company, 2004
  5. Wentzel, M. C., Mbewe, A. and Ekama, G. A. : Batch test for measurement of readily biodegradable COD and active organism concentrations in municipal waste waters. Water SA, 21(2), 117-123, 1995
  6. Shin, H. S., Jeong, H. S. and Nam, S. Y. : Determination of active biomass concentrations in sludge by respirometry. Journal of the Korean Society of Civil Engineers, 21(2-B), 165-170, 2001
  7. Park, Y. S., Woo, H. T. and Kim, D. S. : A study on the organic, nitrogen and phosphorus removal in $(AO)_{2}$ SBR and $A_{2}O$ SBR. Korean Journal of Environmental Health, 31(4), 340-348, 2005
  8. Yoon, C. H., Kim, M. S. and Kim, S. H. : Characteristics of biological nitrogen removal for low C/N ratio municipal wastewater using methanol as an external carbon source in A2O fluidized media process. Journal of Korean Society of Environmental Engineers, 28(6), 687-692, 2006
  9. Henze, M., Grady, C. P. L., Jr, Gufer, W., Marais, G. V. R. and Matsuo, T. : Activated sludge model No. 1, IAWPRC Scientific and Technical Report No. 1, IAWPRC, London, 1987
  10. Park, M. G., Chang, Y. S., Park, C. H. and Park, C. L. : A study on advanced municipal wastewater treatement by daewoo nutrients removal system. Journal of the Korean Society of Water and Wastewater, 9(4), 115-123, 1995
  11. Sewerage Division, Water Supply and Sewerage Policy Office, Ministry of Environment : Statistics of sewerage (2006) 2007, Ministry of Environment, 2007
  12. Ahn, K. H., Hwang, J. H. and Ahn, Y. M. : Effects of external carbon supply on nutrient removal of the continuous flow intermittent decant extended aeration process. Proceeding of Korean Society of Water and Wastewater, E-19, 433-436, 2000