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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Objectives : Effects of various Cu<SUP>2+</SUP> concentrations in the synthetic wastewater on nitrite accumulation was investigated in a submerged partial biofilter reactor (SPBNR).
Methods : Experiments were carried out at the constant operational conditions (T=35℃; pH=9.0 and DO=2.0 mg O₂/L) by varying the concentrations between 5-50 mg Cu<SUP>2+</SUP>/L. The SPBNR, which was operated in an upward flow mode, set-up consisted of a cylindrical stainless steel. The support materials filling ratio was about 23% of the total reactor volume. The SPBNR was inoculated with microorganism drawn from a batch experimental biological reactor operated about one month by using the synthetic wastewater composition.
Results and Discussion : Before exposure to CU<SUP>2+</SUP>, the highest loading rate of 1.3 g NH₄-N(㎡.day) was determined under the operational conditions. Addition of 5 μg CU<SUP>2+</SUP>/L into the waters promoted the activity of organisms and the loading rate achieved to 1.6 g NH₄-N(㎡.day). At the control operational condition, the ratio of NO₂-N/NO<SUB>x</SUB>-N was determined as 0.74, while the ratio increased to 0.78 at the CU<SUP>2+</SUP> concentration of 5 μg/L.
Conclusions : Results indicated that the ammonium oxidizing bacteria (AOB) is more stimulated than the nitrite oxidizing bacteria (NOB) at the concentration of 5 μg CU<SUP>2+</SUP>/L. However, approximately equal NH₄-N removal rate(ANRR) and NO₂-N accumulation rate (NiAR) losses indicated that the AOB and NOB are approximately equally effected at the inlet concentrations of 35 and 50 μg CU<SUP>2+</SUP>/L.
Methods : Experiments were carried out at the constant operational conditions (T=35℃; pH=9.0 and DO=2.0 mg O₂/L) by varying the concentrations between 5-50 mg Cu<SUP>2+</SUP>/L. The SPBNR, which was operated in an upward flow mode, set-up consisted of a cylindrical stainless steel. The support materials filling ratio was about 23% of the total reactor volume. The SPBNR was inoculated with microorganism drawn from a batch experimental biological reactor operated about one month by using the synthetic wastewater composition.
Results and Discussion : Before exposure to CU<SUP>2+</SUP>, the highest loading rate of 1.3 g NH₄-N(㎡.day) was determined under the operational conditions. Addition of 5 μg CU<SUP>2+</SUP>/L into the waters promoted the activity of organisms and the loading rate achieved to 1.6 g NH₄-N(㎡.day). At the control operational condition, the ratio of NO₂-N/NO<SUB>x</SUB>-N was determined as 0.74, while the ratio increased to 0.78 at the CU<SUP>2+</SUP> concentration of 5 μg/L.
Conclusions : Results indicated that the ammonium oxidizing bacteria (AOB) is more stimulated than the nitrite oxidizing bacteria (NOB) at the concentration of 5 μg CU<SUP>2+</SUP>/L. However, approximately equal NH₄-N removal rate(ANRR) and NO₂-N accumulation rate (NiAR) losses indicated that the AOB and NOB are approximately equally effected at the inlet concentrations of 35 and 50 μg CU<SUP>2+</SUP>/L.
목차
1. Introduction
2. Materials and methods
3. Results and discussion
4. Conclusion
References
참고문헌 (57)
참고문헌 신청
R. H. Wijffels, J. Tramper, Nitrification by immobilized cells, Enzyme. Microb. Tech., 17(6), 462-492(1995).
Q. Fu, I. M. Clark, J. Zhu, H. Hu, P. R. Hirsch, The short-term effects of nitrification inhibitors on the abundance and expression of ammonia and nitrite oxidizers in a long-term field experiment comparing land management, Biol. Fertil. Soils., 54, 163-172(2018).
E. Lembera, V. Retšnoib, K. Pachela, E. Loigua, Combined effect of heavy metals on the activated sludge process, Proc. Estonian Acad. Sci. , 67(4), 305-314(2018).
C. Fux, S. Velten, V. Carozzi, D. Solley, J. Keller, Efficient and stable nitritation and denitritation of ammonium-rich sludge dewatering liquor using an SBR with continuous loading, Water Res., 40(14), 2765-2775(2006).
C. Ramos, M. E. Suárez-Ojeda, J. Carrera, Denitritation in an anoxic granular reactor using phenol as sole organic, carbon source, Chem. Eng. J., 288, 289-297(2016).
Q. Fu, I. M. Clark, J. Zhu, H. Hu, P. R. Hirsch, The short-term effects of nitrification inhibitors on the abundance and expression of ammonia and nitrite oxidizers in a long-term field experiment comparing land management, Biol. Fertil. Soils., 54, 163-172(2018).
E. Lembera, V. Retšnoib, K. Pachela, E. Loigua, Combined effect of heavy metals on the activated sludge process, Proc. Estonian Acad. Sci. , 67(4), 305-314(2018).
C. Fux, S. Velten, V. Carozzi, D. Solley, J. Keller, Efficient and stable nitritation and denitritation of ammonium-rich sludge dewatering liquor using an SBR with continuous loading, Water Res., 40(14), 2765-2775(2006).
C. Ramos, M. E. Suárez-Ojeda, J. Carrera, Denitritation in an anoxic granular reactor using phenol as sole organic, carbon source, Chem. Eng. J., 288, 289-297(2016).
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