Journal
BIORESOURCE TECHNOLOGY
Volume 244, Issue -, Pages 382-390Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.07.155
Keywords
Periodic reversal bio-electrocoagulation system; Enzyme activity; Microbial communities; Nitrification rate
Funding
- Program for Liaoning representative office of the China Environment Protection Foundation [CEPF2014-123-1-1]
- Major Science and Technology Program for Water Pollution Control and Treatment [2013ZX07202-010]
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This study explored the nitrification mechanism of a periodic reversal bio-electrocoagulation system with Fe-C electrodes. The ammonia nitrogen removal was compared in four identical cylindrical sequencing bath reactors. Two of them were reactors with Fe-C electrodes (S1) and C-C electrodes (S2), respectively. The other two were a reactor with iron ions (S3) and a traditional SBR (S4), respectively. The results demonstrated that the effect on enhancing nitrification in S1 was the best among all four SBRs, followed by S3, S2 and S4. Iron ions increased the biomass, and electric field improved the proton transfer and enzyme activity. The dominant bacterial genera in the four SBRs were Hyphomicrobium, Thauera, Nitrobacter, Nitrosomonas, Paracoccus and Hydrogenophaga. The iron ions may increase the levels of Nitrosomonas and Nitrobacter, both of which were the main microbes of the nitrification process. This study provided a significant and meaningful understanding of nitrification in a bioelectrocoagulation system.
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