Journal
BIORESOURCE TECHNOLOGY
Volume 196, Issue -, Pages 376-382Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.07.096
Keywords
Anammox; Three-bio-electrode reactor; Electric potential; Extracellular polymeric substances; Key enzymes activities
Funding
- Natural Science Foundation of China [21377014]
- Science and Technology Research Projects of Liaoning Provincial Department of Education [L2013026]
- Dalian Municipal Science and Technology Projects [2012E11SF067]
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This research was designed to investigate the effects of different electric potentials (EPs) on the anammox biomass activity in a three-electrode reactor. Electric potential difference (EPD) of 0.08 V between the working and reference electrodes showed the best nitrogen removal performance. Under the optimal EPD of 0.08 V, the nitrogen removal rate of reactor 2 (R2, EP applied) reached 911 g-N/m3/d on day 188, which was 25.3% higher than that of reactor 1 (R1, the control). Moreover, the scanning electron microscope observation and extracellular polymeric substance analysis proved that EP application was conducive to the anammox cells growing onto the surface of electrode. Additionally, it was demonstrated that long-term EP application increased the crude enzymes activities and the cell quantities of the bio-electrode anammox reactor. Besides, transmission electron microscope observation proved the morphological variation of anammox biomass with continuous EP application. (C) 2015 Elsevier Ltd. All rights reserved.
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