The distribution characteristics of nitrogen element in biofilm on drainage pipe under different C/N conditions
AI Hai-nan1, MA Rui-xiang1, HE Qiang1, XU Jing-wei1, WANG Yin-liang2
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; 2. Southwest Municipal Engineering Design & Research Institute of China, Chengdu 610081, China
Abstract：In order to explore the nitrogen transport and transformation mechanism of the biofilm in the drainage pipeline, the effect of different C/N on the denitrification process of the biofilm are studied. The biofilms of drainage pipes were cultured under the condition that C/N were 2, 5, 10, respectively. Distribution regularities of NH4+, NO2-, NO3- inside the mature biofilms were studied using micro electrode technology. Results showed that biofilm thickness were (1.7±0.1), (1.9±0.1), (2.0±0.1) mm when C/N were 2, 5, 10, respectively, the concentration of DO, NH4+ and NO3- in the depth direction of biofilm gradually decreased while NO2- concentration gradually increased. Under three different C/N conditions, the concentration distribution of the substance within the biofilm showed significant differences. Biofilm thickness affected the distribution of dissolved oxygen, which then affected the N transformation processes in the biofilms.
艾海男, 马瑞祥, 何强, 徐警卫, 王银亮. 不同C/N条件下排水管道生物膜中氮分布特性[J]. 中国环境科学, 2017, 37(12): 4549-4555.
AI Hai-nan, MA Rui-xiang, HE Qiang, XU Jing-wei, WANG Yin-liang. The distribution characteristics of nitrogen element in biofilm on drainage pipe under different C/N conditions. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4549-4555.
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