Determination of decay coefficients of Anammox bacteria under anoxic and anaerobic conditions
JI Qian1,2,, PENG Dangcong1,2,,, ZHAO Wenzhao1,2 1.School of Environmental and Municipal Engineering, Xi' an University of Architecture and Technology, Xi' an 710055, China 2.Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi' an 710055, China
Abstract:As an important parameter to characterize the growth of microorganism, decay coefficient is closely related to the environment conditions. In this study, the decay coefficient of the most common anammox bacteria (Candidatus Brocadia) was analyzed by substrate utilization rate determination method under anoxic (${\rm{NO}}_2^ - $-N, ${\rm{NO}}_3^ - $-N) and anaerobic conditions. The results showed that substrate utilization rate determination method could effectively avoid the experimental errors caused by the decay of other bacteria. The decay coefficients of anammox bacteria under anoxic (${\rm{NO}}_2^ - $-N, ${\rm{NO}}_3^ - $-N) and anaerobic conditions were 0.035 2, 0.025 7 and 0.051 2 d?1, respectively. Compared with other autotrophic bacteria, it was observed that decay coefficient of anammox bacteria was smaller. An anoxic condition of ${\rm{NO}}_3^ - $-N was favorable to the preservation of activity and quantity of anammox bacteria during sludge storage. Key words:anammox/ decay coefficient/ anoxic condition/ anaerobic condition.
图1基质利用速率测定实验装置图 Figure1.Schematic diagram of substrate utilization rate determination
图4不同衰减环境下厌氧氨氧化污泥基质利用速率随时间的变化 Figure4.Variations of substrate utilization rate determination of anammox sludge under different decay environment conditions
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1.School of Environmental and Municipal Engineering, Xi' an University of Architecture and Technology, Xi' an 710055, China 2.Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi' an 710055, China Received Date: 2019-01-02 Accepted Date: 2019-05-08 Available Online: 2019-12-28 Keywords:anammox/ decay coefficient/ anoxic condition/ anaerobic condition Abstract:As an important parameter to characterize the growth of microorganism, decay coefficient is closely related to the environment conditions. In this study, the decay coefficient of the most common anammox bacteria (Candidatus Brocadia) was analyzed by substrate utilization rate determination method under anoxic (${\rm{NO}}_2^ - $-N, ${\rm{NO}}_3^ - $-N) and anaerobic conditions. The results showed that substrate utilization rate determination method could effectively avoid the experimental errors caused by the decay of other bacteria. The decay coefficients of anammox bacteria under anoxic (${\rm{NO}}_2^ - $-N, ${\rm{NO}}_3^ - $-N) and anaerobic conditions were 0.035 2, 0.025 7 and 0.051 2 d?1, respectively. Compared with other autotrophic bacteria, it was observed that decay coefficient of anammox bacteria was smaller. An anoxic condition of ${\rm{NO}}_3^ - $-N was favorable to the preservation of activity and quantity of anammox bacteria during sludge storage.
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