Journal of the Korean Society of Urban Environment (한국도시환경학회지)

The Korean Society of Urban Environment (한국도시환경학회)
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Improvement of Nitrification Efficiency by Activated Nitrifying Bacteria Injection at Low Temperature

활성화된 질산화균 주입에 의한 저온 질산화효율 향상

  • Lim, Dongil (Department of Convergence Technology, Graduate School of Venture, Hoseo University) ;
  • Kim, Younghee (Department of Convergence Technology, Graduate School of Venture, Hoseo University)
  • 임동일 (호서대학교 벤처대학원 융합과학기술학과) ;
  • 김영희 (호서대학교 벤처대학원 융합과학기술학과)
  • Received : 2018.08.20
  • Accepted : 2018.12.21
  • Published : 2018.12.31
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Abstract

In this study, we have developed a lab scale bioreactor to identify the characteristics of nitrification reaction according to operation condition (temperature, inhibitor (as Cl), activated nitrifying bacteria (ANB). etc) to improve nitrification efficiency at low temperature. Recovery rate of nitrification took about 4 days to reach the normal level by injected ANB after inhibition shock of CI injection at $20^{\circ}C$, when measured the concentration of $NO_2{^-}-N+NO_3{^-}-N$ in the effluent. In the case of $10^{\circ}C$, recovery of nitrification rate took about 4 days to reach the level of half to the normal level and 7 days for complete recovery which took 3 days more than those at $20^{\circ}C$. At $10^{\circ}C$ considering the winter season, the specific nitrification rate(SNR) of the from 1 day to 6 days after injected ANB according to its operation condition increased from 0.029 to 0.767 mgN/gSS/hr. The simulated SNR for the 8th day after the injected ANB at $10^{\circ}C$ was 0.840, 3.625 mgN/gSS/hr, respectively as linear function and exponential function, expecting to exceed level of 2.592 mgN/gSS/hr at normal condition. It was confirmed that injection of ANB during low temperature operation has many effects for improving nitrification efficiency through this study. In future studies, if further studies are carried out the determination of ANB injection and the design of efficient ANB reactor considering the changes of operating characteristics by site, it will contribute to the improvement of nitrification efficiency in winter season.

본 연구에서는 Lab 규모의 생물반응장치를 제작하여 운전조건 변화(온도, 저해물질(Cl), 활성화된 질산화균 투입 등)가 질산화에 미치는 영향을 파악하여 저온 조건에서 질산화효율을 향상시킬 수 있는 방안을 찾고자 하였다. $NO_2{^-}-N+NO_3{^-}-N$ 농도 실험에서 $20^{\circ}C$의 경우 염소를 투입하여 질산화균을 사멸한 후 활성화된 질산화균을 투입하면, 정상수준까지 회복하는데 약 4일 정도 소요되었다. $10^{\circ}C$의 경우, 활성화된 질산화균을 투입하여 이전 상태로 회복 되는 데는 약 7일 정도 소요되어 $20^{\circ}C$에 비하여 약 3일이 더 소요되었다. 비질산화속도 실험에서는 $10^{\circ}C$ 운전조건에서 활성화된 질산화균 투입 후 1일경과시 비질산화속도는 0029 mgN/gSS/hr에서 6일 경과시 0.767 mgN/gSS/hr까지 증가하였다. 선형 모형식과 지수함수 모형식에 의한 8일 경과후의 비질산화속도는 각각 0.840, 3.625 mgN/gSS/hr로 예측되어 정상수준인 2.592 mgN/gSS/hr을 상회하는 것으로 예상되었다. 본 연구를 통하여 저온 운전시 활성화된 질산화균을 주입하면 질산화효율을 향상시키는데 많은 효과가 있음을 확인하였다. 향후 연구에서 현장별 운전특성을 고려한 ANB 투입량의 결정, 효율적인 ANB reactor의 설계 등에 대한 추가적인 연구가 진행된다면 동절기 질산화효율 향상에 많은 기여를 할 수 있을 것이다.

Keywords

References

  1. Um, C. Y., Chu, K. H., Yun, Z. H., Choi, I. H., Park, J. Y., Lee, H. S., and Ko, K. B., "Evaluation of Korean Water Quality Standards in Winter by Characteristics and Statistical Analyses of the Effluent Water Quality at the Sewage Treatment Plants in Korea," Journal of Korean Society on Water Environment, 27(4), 523-532 (2011).
  2. US. EPA. "Manual Nitrogen Control, EPA/625/R-93/010," U.S. Environmental Protection Agency. Washington, DC. (1993).
  3. Kim, J. S., "A study on the correlation between control factors and denitrifiers in a full-scale denitrifying upflow fluidized bed reactor (FBR)," Ph. D. Dissertation, Seoul National University, 1-3 (2014).
  4. Kim, J. T., "A Study on Strengthening Option of T-N Effluent Water Quality Standards of Sewage Treatment Plants," Journal of Korean Society on Water Environment, 34(2), 216-225 (2018).
  5. Nam, G. Y., "A Study on Biokinetic Parameter of Nitrification and Denitrification using Microorganism Immobilization Media," Master's Thesis, University of Seoul, 10-11 (2018).
  6. Lee, U. G., "A Study on Optimum Operating Condition for Efficient nitrogen Removal at WWTP in Winter Days," Master's Thesis, Seoul National University of Technology, 1-2 (2006).
  7. Roh, S. H. and Kim, S. I., "Effects of External Carbon Source Dosage and Temperature in the SBR Process," Theories and Applications of Chem. Eng., 10(2), 1693-1696 (2004).
  8. Lim, J. Y. and Kil, K. I., "A Study of RCSTP Nutrient Removal Efficiency in Winter Season," Journal of Wetland Research, 16(3), 363-370 (2014). [Korean Literature]
  9. Kil, H. K. and Kang, S. H., "A Study on the NBOD Reduction in Wastewater Treatment Plant using Sludge Reaeration During Winter Season," Journal of the Korean Society of Urban Environment, 16(2), 207-213 (2016).
  10. Kim, D. H., The Study for improving nitrification rate using rejection water, Master's Thesis, Korea University, pp. 1-2 (2013). [Korean Literature]
  11. Ahmed, A. M. and Ibrahim, A. A., "An Energy Integration Approach on UHDE Ammonia Process," World Acad. Science, Engi. Tech., 6, 1705-1711 (2012).
  12. Randall, C. W., Barnard, J. L., and Stensel, H. D., "Design and retrofit fo wastewater treatment plants for biological nutrient removal," Water Quality Management Library, 5, Technomic Publishing Company, Inc., Lancaster, PA. (1992).