Journal
WATER RESEARCH
Volume 85, Issue -, Pages 235-243Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.08.040
Keywords
Biological nitrogen removal; Nitrite-dependent anaerobic methane oxidation (n-damo); Medium improvement; Transition metal
Funding
- National Natural Science Foundation of China [51478415, 41276109]
- Fundamental Research Funds for the Central Universities [2015QNA6012]
- Science and Technology Project of Zhejiang Province [201407070]
- Key Science and Technology Innovation Team Project of Zhejiang Province [2013TD12]
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Nitrite-dependent anaerobic methane oxidation (n-damo) is a potential bioprocess for treating nitrogen-containing wastewater. This process uses methane, an inexpensive and nontoxic end-product of anaerobic digestion, as an external electron donor. However, the low turnover rate and slow growth rate of n-damo functional bacteria limit the practical application of this process. In the present study, the short- and long-term effects of variations in trace metal concentrations on n-damo bacteria were investigated, and the concentrations of trace metal elements of medium were improved. The results were subsequently verified by a group of long-term inoculations (90 days) and were applied in a sequencing batch reactor (SBR) (84 days). The results indicated that iron (Fe(II)) and copper (Cu(II)) (20 and 10 mu mol L-1, respectively) significantly stimulated the activity and the growth of n-damn bacteria, whereas other trace metal elements, including zinc (Zn), molybdenum (Mo), cobalt (Co), manganese (Mn), and nickel (Ni), had no significant effect on n-damn bacteria in the tested concentration ranges. Interestingly, fluorescence in situ hybridization (FISH) showed that a large number of dense, large aggregates (10-50 mu m) of n-damo bacteria were formed by cell adhesion in the SBR reactor after using the improved medium, and to our knowledge this is the first discovery of large aggregates of n-damo bacteria. (C) 2015 Elsevier Ltd. All rights reserved.
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