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농축조 상징액을 대상으로한 실험실 규모 아질산화 반응조 분석

Analysis of laboratory scale nitriation reactor using sludge thickener supernatant

  • 임지열 (고려대학교 건축사회환경공학과) ;
  • 길경익 (서울과학기술대학교 건설시스템공학과)
  • Im, Jiyeol (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Gil, Kyungik (Department of Civil Engineering, Seoul National University of Science and Technology)
  • 투고 : 2015.09.02
  • 심사 : 2015.11.18
  • 발행 : 2015.11.30

초록

질소는 수계 부영양화를 유발하는 주요 원인이며, 수계 보호를 위해 반드시 처리해야 하는 오염물질이다. 본 연구에서는 고농도 질소를 처리하여 하수처리장 운전 효율 증대를 위한 방안을 연구하고자 하였다. 약 250일간 하수처리장 농축조상징액을 이용하여 실험실 규모 반응조를 운전하였다. 실험실 반응조 운전은 안정적인 아질산화 반응을 유도하고, 관련 운전 인자 영향을 분석하고자 하였다. 연구 결과 체류시간 조절을 통해 인위적으로 아질산화 반응이 유도가능한 것을 확인하였으며, 안정적인 아질산화 반응이 유도되는 구간을 파악하였다. 특히, 체류시간 1일 조건에서는 90%에 가까운 고효율의 아질산화율을 보이는 것을 확인하였다. 특히 ammonium nitrogen load는 암모니아성 질소 제거율과 아질산화율에 영향을 미치는 것으로 나타났다. 높은 ammonium nitrogen load 조건에서는 아질산화율과 암모니아성 질소 효율이 감소하였다. 반면, 낮은 ammonium nitrogen load 조건에서는 아질산화율이 감소하는 것으로 나타났다. 이는 아질산화 반응을 위해 암모니아성질소 농도 및 체류시간의 조절이 필요하다는 것을 의미한다. 농축조 상징액과 같은 슬러지 처리 공정 내 고농도 질소를 함유한 폐수는 아질산화 반응을 적용할 수 있으며, 이는 하수처리장 개조 방안으로 제안 될 수 있을 것으로 판단된다.

Nitrogen is one of main causes to induce eutrophication of water system and one of contaminants that must be treated for protection of water system. In this study, it was intended to identify a method to increase operation efficiency of municipal wastewater treatment plant (MWTP) by treating high concentration nitrogen. A laboratory scale reactor was operated by using sludge thickener supernatant in the MWTP. During operation of the laboratory scale reactor, it was intended to induce stable nitritation and analyze effects of related operation factors. As results, it was shown that the nitiritation could be induced artificially through control of retention time and sections where the stable nitiritation was induced were identified also. In particular, highly efficient nitrite conversion efficiency near 90% was identified in condition of 1 day retention time. Especially, it was shown that ammonium nitrogen load affected ammonium nitrogen removal efficiency and nitrite conversion efficiency. In the condition of high ammonium nitrogen load, the nitrite conversion efficiency and the ammonium nitrogen removal efficiency decreased. On the contrary in the condition of low ammonium nitrogen load, it was found that the nitrite conversion efficiency decreased. It means that control of ammonium nitrogen concentration and its retention time is needed for the nitritation. It is considered that for the sewage containing high load nitrogen in sludge treatment process as like the sludge thickener supernatant, the nitritation can be applied, which can be suggested as a modification method of MWTP.

키워드

참고문헌

  1. APHA, AWWA and WEF (1998). Standard method for examination of water and wastewater. 20th edition, Washington DC, US.
  2. Gali, A, Dosta, J, Lopez-palau, S and Mata-alvarez, J (2008) SBR technology for high ammonium loading rates. Wat. Sci. & Tech., 58(2), pp. 467-472. https://doi.org/10.2166/wst.2008.408
  3. Gil, K, Choi, E, Yun, Z, Lee, J, Ha, J and Park, J (2002) The nomographic design approach to recycled water treatment by the nitritation process, Wat. Sci. & Tech., 46(11-12), pp. 85-92.
  4. Gil, K and Choi, E (2004) Nitrogen removal by recycle water nitritation as an attractive alternative for retrofit technologies in MWTPs, Wat. Sci. & Tech., 49( 5-6), pp. 39-46.
  5. Im, J and Gil, K (2011a) Evaluation of Nitritation of High Strength Ammonia with Variation of SRT and Temperature using Piggery Wastewater, J. of Korean society on water environment, 27(5), pp. 563-571. [Korean Literature]
  6. Im, J and Gil, K (2011b). Effect of anaerobic digestion on the high rate of nitritation, treating piggery wastewater, J. of Environmental Sciences, 23(11), pp. 1794-1800. https://doi.org/10.1016/S1001-0742(10)60614-6
  7. Im, J, Jung, J, Bae, H, Kim, D and Gil K (2014). Correlation between Nitrite Accumulation and Concentration of AOB in a Nitritation reactor. Environ Earth Sci, 72, pp. 289-297. https://doi.org/10.1007/s12665-014-3285-7
  8. Kang, S, K, Jong, S, P, Hyeon, S, H, Kyoung, H, R (2012) Characteristics of Non-point Source Runoff in Housing and Industrial Area during Rainfall. Korean Wetlands Society, 14(4), pp. 581-589. [Korean Literature]
  9. Kim, LH, Lee, S (2005). Characteristics of Metal Pollutants and Dynamic EMCs in a Parking Lot and a Bridge during Storms. J. of Korean society on water environment, 21(3). pp. 248-255. [Korean Literature]
  10. Lee, EJ, Son, H, Kang, HM, Kim, LH (2007). Characteristics of Non-point Pollutant from Highway Toll Gate Landuse. J. of Korean Society of Road Engineers, pp. 185-192. [Korean Literature]
  11. Li, H B, Cao, H B, Li, Y P, Zhang, Y and Liu, H R (2010). Effect of Organic Compounds on Nitrite Accumulation during the Nitrification Process for Coking Wastewater. Wat Sci Tech, 62(9), pp. 2096-2105. https://doi.org/10.2166/wst.2010.371
  12. Yang, Q, Liu, X H, Peng, Y Z, Wang, S Y, Sun, H W and Gu, S B (2009). Advanced Nitrogen Removal via Nitrite from Municipal Wastewater in a Pilot-plant Sequencing Batch Reactor. Wat Sci Tech, 59(12), pp. 2371-2377. https://doi.org/10.2166/wst.2009.304
  13. van de Graaf, A A, de Bruijn, P, Robertson, L A, Kuenen, J G and Mulder, A (1991). Biological oxidation of ammonium under anoxic conditions : ANAMMOX process. Intern. Symp. Environ. Biotechnol. 2. pp. 667-669.
  14. van Kempen. R, ten Have, C C R, Meijer. S C F, Mulder. J W and Duin. J O J (2001). SHARON process evaluated for improved wastewater treatment plznt nitrogen effluent quality. Wat Sci Tech, 52(4), pp. 55-62.
  15. van Dongen, U, Jetten, M C M and van Loosdrecht, M C M (2001). The SHARON-ANAMMOX process for the treatment of ammonium rich wastewater. Wat Sci Tech, 44(1), pp. 153-160.
  16. van Loosdrecht, M C M. and Jetten, M C M. (1998). Microbiological conversions in nitrogen removal. Wat Sci Tech, 38, pp. 1-7.