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Fast start-up of Anammox process with appropriate ferrous iron concentration
- Bi, Zhen, Qiao, Sen, Zhou, Jiti, Tang, Xin, Zhang, Jie
- Bioresource technology 2014 v.170 pp. 506-512
- anaerobic ammonium oxidation, heme, hydrazine, iron, nitrifying bacteria, quantitative polymerase chain reaction
- In this study, three upflow column reactors were compared for anaerobic ammonium oxidation (Anammox) process start-up time with different ferrous iron concentration in feeding. Continuous experiments indicated that the start-up time of Anammox process could be shortened from 70 to 58d in R2 (0.06mM Fe2+) and 50d in R3 (0.09mM Fe2+). The Anammox activity appeared after 16days operation in R3. Quantitative PCR (q-PCR) analysis demonstrated a significant increase in quantity of Anammox bacteria in R3 compared with the other two reactors during entire operation. At the Fe(II) concentration of 0.09mM, the heme c levels inside Anammox cell and hydrazine dehydrogenase (HDH) activity increased dramatically, which could be the trigger of fast Anammox start-up.