The long-term and short-term effect of Fe(Ⅲ) on nitrogen removal efficiency of Anammox sludge
GUO Jia-wen1, LIN Xin1, LI Xiang1,2,3, HUANG Yong1,2, LIU Tian-qi1, ZHAO Wei-dong1
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; 2. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China; 3. Suzhou Tianjun Environmental Technology Co., LTD., Suzhou 215009, China
Abstract:The effects of Fe(Ⅲ) concentration on nitrogen removal efficiency in Anammox sludge were studied in short-term and long-term. The proper amount of Fe(Ⅲ) could enhance the nitrogen removal efficiency of Anammox bacteria,0.09mol/L was the most suitable concentration, the nitrogen removal rate was 0.238kg/(L·d), compared with the control group increased by 14.2%. The nitrogen removal rate was decreased gradually with the influent Fe(Ⅲ) concentration increased constantly. When the Fe(Ⅲ) concentration increased to 0.18mol/L, the nitrogen removal rate dropped to 0.215kg/(L·d)decreased by 10.75% compare with 0.09mol/L. The half-saturation constant (KFe) was 0.012mol/L, the inhibiting kinetic constant (KI) was 0.449mol/L obtained by Haldane inhibition kinetic model fitting. The long-term experiment results showed that at 0.09mol/L Fe(Ⅲ) concentration, the nitrogen removal rate of Anammox increased the fastest, and gradually decreased with the increase of Fe(Ⅲ) concentration. the conversion ratio of NO2--N and NH4+-N was significantly lower than the theoretical value of 1.32, fluctuate between 1.108 and 1.227, and decreased with the increase of concentration of Fe(Ⅲ), presumably due to the addition of Fe(Ⅲ) instead of NO2--N as electron acceptor. Scanning electron microscope results showed that the addition of Fe(Ⅲ) could make the Anammox bacteria cell structure more stable.
郭佳文, 林兴, 李祥, 黄勇, 刘天琪, 赵魏东. Fe(Ⅲ)对Anammox污泥脱氮效能长短期影响[J]. 中国环境科学, 2024, 44(3): 1278-1285.
GUO Jia-wen, LIN Xin, LI Xiang, HUANG Yong, LIU Tian-qi, ZHAO Wei-dong. The long-term and short-term effect of Fe(Ⅲ) on nitrogen removal efficiency of Anammox sludge. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1278-1285.
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