Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Dewatering Filtrate Treatment with Center Well Depth of Secondary Clarifier in Small Sewage Treatment Plant

소규모하수처리시설의 이차침전조 내통길이 변화를 통한 탈수여액의 처리

  • Choi, Jung-Su (Department of Environmental Energy System Engineering, Graduate School of Kyonggi University) ;
  • Kim, Hyun-Gu (Department of Environmental Energy System Engineering, Graduate School of Kyonggi University) ;
  • Lee, Dong-Ho (Department of Environmental Energy System Engineering, Graduate School of Kyonggi University) ;
  • Joo, Hyun-Jong (Department of Environmental Energy Engineering, Kyonggi University)
  • 최정수 (경기대학교 일반대학원 환경에너지시스템공학과) ;
  • 김현구 (경기대학교 일반대학원 환경에너지시스템공학과) ;
  • 이동호 (경기대학교 일반대학원 환경에너지시스템공학과) ;
  • 주현종 (경기대학교 환경에너지공학과)
  • Received : 2013.07.31
  • Accepted : 2013.09.30
  • Published : 2013.10.30
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Abstract

The purpose of this study is to evaluate a de-watering filtrate treatment and the possibility of securing biological treatment capacity by changing the structure of the secondary clarifier. Accordingly, the column test was conducted to determine the effect of polymer in the de-watering filtrate on sludge sedimentation. Also, the characteristics of de-watering filtrate processing was evaluated through batch test and continuous processing operation. The results showed that sludge settling velocity increased with higher polymer concentration, and that effluent SS concentration was found to decrease. Regarding processing characteristics of de-watering filtrate, the removal efficiency of TSS and TBOD5 increased as the length of secondary clarifier was longer. Also, comparing injections into anoxic tank and secondary clarifier, de-watering filtrate by continuous infusion treatment process showed stability in both conditions. Therefore, by modifying the structure of secondary clarifier, efficient processing of de-watering filtrate is expected to be possible and processing capacity of small sewage treatment plants is considered to be improved.

본 연구의 목적은 이차침전조의 구조개선을 통해 탈수여액 처리와 생물학적 처리용량 확보의 가능성을 평가하는데 있다. 이에 따른 연구의 절차로는 탈수여액 내 함유된 polymer가 슬러지 침전에 미치는 영향을 column test를 통해 평가하였으며, 회분식 실험과 연속식 처리공정운전을 통해 탈수여액의 처리 특성을 평가하였다. 그 결과 슬러지 침강속도는 polymer 주입율이 증가할 수 록 증가하는 경향을 나타냈으며, 상징수의 SS 농도는 감소하는 것을 알 수 있었다. 탈수여액의 처리 특성은 이차침전조 내통 길이가 길수록 탈수여액 내 함유된 TSS 및 TBOD5의 제거효율이 증가하는 경향을 보였다. 또한 연속식 처리공정 적용 결과는 탈수여액 주입위치를 각각 무산소조와 이차침전조에 주입한 경우를 비교하였을 때 두 조건에서 모두 안정적인 방류수질을 보였다. 따라서 이차침전조의 구조개선을 통해 탈수여액의 효율적인 처리가 가능 할 것으로 판단되며, 소규모 하수처리장의 경우 처리용량 부족 문제를 해결할 수 있을 것으로 사료된다.

Keywords

References

  1. Ahn, Y. H. and Kum, D. J., "Characterization of Infiltration/ inflow (I/I) and Combined Sewer Overflow (CSOs) in Municipal Wastewater Collection System," Kor. Soc. Civil Eng., 24(4), 381-390(2004).
  2. Choi, C. W., "Infiltration/Inflow and Sewage Characteristics by Improvement of Sanitary Sewer System," University of Seoul Master's degree, pp. 1-18(2008).
  3. Korea Ministry of Environment, "Statistics of Sewerage," http://library.me.go.kr
  4. Tchobanoglous, G., "Wastewater Engineering Collection and Pumping of Wastewater," McGraw-Hill, Metcalf and Eddy Inc., USA.
  5. Zdybiewska, M. W. and Kula, B., "Removal of Ammonia Nitrogen by the Precipitation Method, on the Example of Some Selected Waste Waters," Water Sci. Technol., 24(7), 229- 234(1991).
  6. Dyhr-Jensen, K. and Brix, H., "Effects of pH on ammonium uptake by Typha latifolia L.," Plant, Cell Environ., 19(12), 1431-1436(1996). https://doi.org/10.1111/j.1365-3040.1996.tb00022.x
  7. Talmadge, W. P. and Fitch, E. C., "Determining Thickener Unit Areas," Ind. Eng. Chem., 47(1), 409-410(1955). https://doi.org/10.1021/ie50543a026
  8. Lee, S. S., "A Study on Optimum Coagulation Condition of Sludge Dehydration by Filter Press," Yeung nam University Master's degree, pp. 31-34(2009).
  9. Song, S. H., "Auto-Control of Polymer Dose for Efficient De-watering of Sewage Sludge," Inje University Master's degree, pp. 15-17(2008).
  10. Tchobanoglous, G. and Burton, F. L., "Wastewater Engineering Treatment and Reuse," McGraw-Hill, New York, pp. 1135-1137(2004).
  11. APHA, "Standard Methods for the Examination of Water and Wastewater," 21st Edition, American Public Health Association, USA.
  12. Son, S. M., "Investigation of Phosphorus Removal from Wastewater Using Clay Materials as a Coagulant-aids," Kon Kuk University Master's degree, pp. 88-91(2012).
  13. Kim, J. W., "A Study on Characteristics of Sedimentation Rate Suspended Fine Particles under Floc Size and Density," Kor. Soc. Hazard. Mitigation, 9(4), 107-113(2009).
  14. Choi, J. S. and Joo, H. J., "Study on Change of Microbial Activity and Removal Efficiency of Phosphorus with Alum Injection in the Biological Process," Kor. Soc. Water Environ., 27(2), 188-193(2011).
  15. Busan Environmental Corporation, "Inhibition of Biological Treatment by Flocculant Impact Analysis," http://www.beco. go.kr/net_html/index.asp
  16. Rhee, W. H., "An Endogenous De-nitrification in the Reject Water Treatment Process," Korea University Master's degree, pp. 4-6(2011).
  17. Mandt, M. G. and Bell, B. A., "Oxidation Ditches In Wastewater Treatment," Ann Arbor Science Publishers, USA, pp. 32-33(1982).
  18. Tchobanoglous, G. and Burton, F. L., "Wastewater Engineering Treatment and Reuse," McGraw-Hill, New York, pp. 1046-1047(2004).
  19. Steiner A. E., McLaren D. A. and Foster C. F., "The nature of activated sludge floc," Water Res., 10(1), 25-30(1976). https://doi.org/10.1016/0043-1354(76)90153-6
  20. Rideau, J. P. and Morfaux, J. N., "Decanting Accidents due to Bulking of Activated Sludge in Biological Conditioning of Effluent of Agricultural and Food Industries," Technique de I'Eau et de I'Assainissement, 340, 17-27(2000).
  21. Kwon, J. C., Ahn, D. W., Jung, Y. H., Kim, D. U. and Song, U. Y., "A Practical Plant Application for Improvement of Secondary Clarifier in Biological Nutrient Removal Process, Preparing for the Total Emission Control," Proceedings of the 2006 Autumn Co-Conference of the Korean Society on Water Environment and Korean Society of Water and Wastewater, pp. 42-46(2006).
  22. Kim, H. K., "A Study on the Biosorption Process for Organic and Nutrient Removal from the Wastewater," Yonsei University Master's degree, pp. 95-96(2003).
  23. Kwon, J. C., Ahn, D. W., Jung, Y. H., Choi, K. J. and Kim, Y. H., "A Study on the Improvement by the Secondary Clarifier Reforms in Nutrient Removal Process," In proceedings of 2006 KSEE Fall Conference, Korean Society of Environmental Engineering, Kangnung National University, pp. 50-54(2006).