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Effects of the ammonium loading rate on nitrite-oxidizing activity during nitrification at a high dose of inorganic carbon
In this study, the effects of the ammonium loading rate (ALR) and inorganic carbon loading rate (ILR) on the nitrification performance and composition of a nitrifying bacterial community were investigated in a moving bed biofilm reactor, using poly(vinyl alcohol) (PVA) sponge cubes as a supporting carrier. Between the two ALRs of 0.36 and 2.16 kg-N m−1 d−1, stable partial nitritation was achieved at the higher ALR. Inorganic carbon was dosed at high levels: 33.1, 22.0, 16.4, 11.0, and 5.4 times the theoretical amount. Nonetheless, nitrification efficiency was not affected by the ILR at the two ALRs. Quantitative PCR analysis of ammonia- and nitrite-oxidizing bacteria revealed that ALR is an important determinant of partial nitritation by accumulating ammonia-oxidizing bacteria in the nitrification system. In comparison, two nitrite-oxidizing bacterial genera (Nitrobacter and Nitrospira) showed almost the same relative abundance at various ALRs and ILRs. Terminal restriction fragment length polymorphism targeting the gene of ammonia monooxygenase subunit A revealed that Nitrosomonas europaea dominated under all conditions.
Effects of the ammonium loading rate on nitrite-oxidizing activity during nitrification at a high dose of inorganic carbon
In this study, the effects of the ammonium loading rate (ALR) and inorganic carbon loading rate (ILR) on the nitrification performance and composition of a nitrifying bacterial community were investigated in a moving bed biofilm reactor, using poly(vinyl alcohol) (PVA) sponge cubes as a supporting carrier. Between the two ALRs of 0.36 and 2.16 kg-N m−1 d−1, stable partial nitritation was achieved at the higher ALR. Inorganic carbon was dosed at high levels: 33.1, 22.0, 16.4, 11.0, and 5.4 times the theoretical amount. Nonetheless, nitrification efficiency was not affected by the ILR at the two ALRs. Quantitative PCR analysis of ammonia- and nitrite-oxidizing bacteria revealed that ALR is an important determinant of partial nitritation by accumulating ammonia-oxidizing bacteria in the nitrification system. In comparison, two nitrite-oxidizing bacterial genera (Nitrobacter and Nitrospira) showed almost the same relative abundance at various ALRs and ILRs. Terminal restriction fragment length polymorphism targeting the gene of ammonia monooxygenase subunit A revealed that Nitrosomonas europaea dominated under all conditions.
Effects of the ammonium loading rate on nitrite-oxidizing activity during nitrification at a high dose of inorganic carbon
Choi, Minkyu (Autor:in) / Cho, Kyungjin (Autor:in) / Jeong, Dawoon (Autor:in) / Chung, Yun-Chul (Autor:in) / Park, Joonhong (Autor:in) / Lee, Seockheon (Autor:in) / Bae, Hyokwan (Autor:in)
Journal of Environmental Science and Health, Part A ; 53 ; 708-717
03.07.2018
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
The Effect of Inorganic Carbon Limitation on Nitrite Oxidizing Bacteria
| British Library Conference Proceedings | 2012
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