Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Characteristics of Transformation Process of Wastewater in Sewer

하수관거내 오염물질 성상변화 특성

  • Lee, Doo-Jin (Korea Institute of Water and Environment, Korea Water Resources Corporation) ;
  • Kim, Moon-Il (Department of Civil and Environmental Engineering, Hanyang University)
  • 이두진 (한국수자원공사 수자원연구원 국제상하수도연구소) ;
  • 김문일 (한양대학교 토목환경공학과)
  • Published : 2005.09.30
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Abstract

In this study, variations of water quality, sediment size and contaminant substances are analyzed at upstream and downstream in sewer systems in order to evaluate the characteristics of wastewater transformation by physico-chemical and biological reactions. The differences of DOC concentration between up and down stream showed the range of $-5.8{\sim}18.6$ from the result of continuous measurement at up and down stream. About 8.4% of DOC concentration was reduced and reduction rate was 2.3 mg/L/km. SS reduction rate was measured by 5.5 mg/L/km, 0.22 mg/L/min from upstream to downstream, which was twice than DOC reduction rate. When pollution load reduction was evaluated considering infiltration/inflow effect, DOC load was eliminated from 1,230 ka/d to 1,167 kg/d by physi-chemical and biological reaction in a sewer and 7.8% of the SS in upstream station was reduced under dry weather condition. The results showed that the characteristics of transformation process of wastewater in sewer should be considered for design and operation of wastewater treatment plant.

본 연구에서는 하수가 관거를 유하하면서 물리, 화학, 생물학적 반응을 통하여 오염물질이 제거되는 특성을 평가하기 위하여 실제 관거를 대상으로 상, 하류수질변화를 분석하고 관거 퇴적물의 입경변화와 오염물함유량을 평가하였다. 상류와 하류가 2.4 km 떨어진 두 지점에서 24시간 연속 채취된 시료에 대한 DOC 분석결과 상하류의 농도차이는 $-5.8{\sim}18.6\;mg/L$의 범위를 보였다. 상류측 평균 DOC농도를 기준으로 8.4%가 감소하였으며, 관거길이당 감소율은 2.3 mg/L/km, 평균체류시간에 의한 감소율은 0.093 mg/L/min으로 나타났다. SS의 경우 상류와 하류간의 수질차는 $-10.5{\sim}34.6\;mg/L$, 평균 SS 농도차는 13.3 mg/L, 상류수질을 기준으로 10.4%정도 감소하였으며 관거길이당 감소율은 5.5 mg/L/km, 평균체류시간에 의한 감소율은 0.22 mg/L/min으로 DOC에 비하여 약 2배 정도 높은 감소율을 나타내었다. 침입수/유입수를 고려하여 DOC, SS의 누적오염부하를 비교한 결과, DOC의 경우 일누적오염부하를 기준으로 상류 1,230 kg/d, 하류 1,167 kg/d으로 5.2%가 감소하였고, SS의 경우 상류 2,371kg/d, 하류는 2,186 kg/d로 7.8% 감소하였다. 이러한 결과는 하수를 처리장까지 수송하튼 관거시스템내에서 오염부하의 일부가 제거되고 있음을 보여주는 것이며, 하수처리장의 설계 및 운영시 관거를 통한 감소영향을 고려하는 것이 필요함을 알 수 있다.

Keywords

References

  1. Standard Mchtods for the Examination of Water and Wastewaters APHA;AWWA;WEF
  2. J. Water Pollution Fedn. v.49 The use of oxygen to treat sewage in a rising main Boon, A.G.;Skellett, C.F.;Newcombe, S.;Jones, J.G.;Foster, C.F.
  3. Water Sci. Technol. v.31 no.7 Aerobic biodegradation and microbial population of a synthetic wastewater in a channel with suspended and attached biomass Cao, Y.S.;Alaerts, G.J.
  4. J. of Environ. Eng. v.127 no.4 Removal or dissolved organic carbon in sanitaty gravity sewer Chen, G.;Leung, D.;Huang, J.
  5. Water Sci. Technol. v.31 no.7 The effect of organic reactions in a collection system on wastewater treatment plant performance Gall, B.;Takacs, I.;Patry, G.
  6. Water Sci. Technol. v.45 no.6 Wastewater COD characterization: biodegradability of physicochemical fractions Ginestet, P.;Maisonnier, A.;Sperandio, M.
  7. Sewer processes, Microbial and chemical process engineering of sewer networks Hvitved-Jacobsen
  8. Water Sci. Technol. v.38 no.10 Wastewater quality changes during transport in sewers-An integrated aerobic andanaerobic model concept for carbon and suIfur microbial transformations Hvitved-Jacobsen, T.;Vollertsen, J.;Tanaka, N.
  9. Water Sci. Technol. v.47 no.4 Removal of The Organic Surface Layer in Combined Sewer Sediment using flushing Gate Laplace, D.;Oms, C.;Ahyerre, M.;Chebbo, G.;Lemasson, J.;Felouzis, L.
  10. Stormwater Collection Systems Design Handbook Mays, L.W.
  11. Water Sci. Technol. v.31 no.7 Substrate removal in long sewer lines Ozer, A.;Kasirga, E.
  12. Prog. Water Technol. v.9 The forecasting of sulfide buildup rates in sewers Pomeroy, R.D.;Parkhurst, J.D.
  13. Water Sci. Technol. v.37 no.1 A Laboratory study of the erosion and transport of Cohesive-Like Sediment Mixtures in Sewer Simon, J.T.;Peter, J.R.;Adrian, J.S.
  14. Water Sci. Technol. v.37 no.1 Transformation of wastewater organic matter in sewer under changing aerobic-anaerobic conditions Tanaka, N.;Hvitved-Jacobsen, T.;Ochi, T.;Sato, N.
  15. Pre-Conference Seminar Proceedings, 65th Annual Conference & Exposition New Orleans Stormvater Monitoring, Measurement, and Management WEF