A Comparative Study on COD Fractionation Methods of Wastewater

하수의 COD 분류 시험 방법에 관한 비교 연구

  • Received : 2010.06.29
  • Accepted : 2010.08.06
  • Published : 2010.08.15

Abstract

The influent COD of municipal wastewater has been divided into 4 fractions; readily soluble biodegradable, slowly particulate biodegradable, soluble and particulate unbiodegradable COD. The mathematical modeling of biological wastewater treatment processes and the design and operation of nutrient removal plants require a reliable and accurate estimate of the composition of influent wastewater COD. COD utilization rate is proportional to the oxygen uptake rate(OUR), so a batch biodegradation test with OUR measurement has been effectively used for the determination of COD fractionation. But the mathematical model of COD utilization and heterotrophs synthesis is essential to interpret the OUR measurement. Mamais method is another method for determining readily biodegradable soluble COD. Like the OUR test method, batch biodegradation test is necessary but it does not require mathematical model. These two methods for determining COD fractionation are introduced here in detail. Experimental results showed that COD composition by Mamais method is not different to that by OUR test method so, either of them can be used.

Keywords

Acknowledgement

Supported by : 조선대학교

References

  1. 최영균, 김성홍, 정태학 (2003) 하수의 유기물 분류에 미치는 동력학적 영향인자의 민감도 분석, 상하수도학회지, 17(3), pp.427-434.
  2. APHA, AWWA, WEF (1992) Standard Methods for the examination of water and wastewater - 18th ed., Washington DC, USA.
  3. Dold P.L., Ekama G.A. and Marais G.v.R. (1980) A general model for the activated sludge process, Progress Water Technology, 12(Toronto), pp.47-77.
  4. Ekama G.A., Dold P.L. and Marais G.v.R. (1986) Procedures for determining influent COD fractions and the maximum specific growth rate of heterotrophs in activated sludge systems, Water Science and Technology, 18(Copenhagen), pp.91-114.
  5. Gujer M., Henze M., Mino T., Matsuo T., Wentzel M.C. and Marais G.v.R. (1995) The activated sludge model no. 2 : Biological phosphorus removal, Water Science and Technology, 31(2), pp.1-11. https://doi.org/10.1016/0273-1223(95)00175-M
  6. Henze M., Crady Jr. C.P.L., Gujer W, Marais G.v.R. and Matsuo T. (1987) A general model for single-sludge wastewater treatment systems, Water Research, 21(5), pp.505-515. https://doi.org/10.1016/0043-1354(87)90058-3
  7. Mamais D, Jenkins D and Pitt P. (1993) A rapid physical-chemical method for the determination of readily biodegradable soluble COD in municipal wastewater, Water Research, 27(1), pp.195-197. https://doi.org/10.1016/0043-1354(93)90211-Y
  8. Mullis M.K. and Schroeder E.D. (1971) A rapid biochemical oxygen demand test suitable for operational control, Journal Wat. Pollut. Control Fed., 43(2), pp.209-215.
  9. Wentzel M.C., Mlbewe A., Lakay M.T. and Ekama G.A. (1999) Batch test for characterisation of the carbonaceous materials in municipal wastewaters, Water SA, 21(2), pp.117-124.