Journal
BIORESOURCE TECHNOLOGY
Volume 170, Issue -, Pages 506-512Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.07.106
Keywords
Anammox; Start-up; Fe effects; Heme c; Enzyme activity
Funding
- Natural Science Foundation of China [21377014, 51008045]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QAK201305]
- Dalian Municipal Science and Technology Projects [2012E11SF067]
- Fundamental Research Funds for the Central Universities [DUT12LK20]
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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 58 d in R2 (0.06 mM Fe2+) and 50 d in R3 (0.09 mM Fe2+). The Anammox activity appeared after 16 days 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 0.09 mM, the heme c levels inside Anammox cell and hydrazine dehydrogenase (HDH) activity increased dramatically, which could be the trigger of fast Anammox start-up. (C) 2014 Elsevier Ltd. All rights reserved.
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