Journal
BIORESOURCE TECHNOLOGY
Volume 292, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122000
Keywords
Integrated fixed-film activated sludge; Microbial fuel cells; Electrochemical biofilm; Autotrophic denitrification; Enhanced nutrient removal
Funding
- National Natural Science Foundation of China [51708167, 51708157, 41877396]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2017DX02, ES201905]
- Shenzhen Key Technology R&D Program of China [JSGG20180507183210868]
- State Key Laboratory of Separation Membranes and Membrane Processes (Tianjin Polytechnic University) [M2-201701]
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In order to improve the nutrient removal capacity of the carriers in the integrated fixed-film activated sludge (IFAS) system, a novel electrochemically active carrier was developed in this study. The nutrient removal performance of the carrier under different operating conditions was deeply investigated based on response surface methodology. The higher concentration of mixed liquor suspended solid (MLSS) and lower dissolved oxygen (DO) value inhibited ammonium (NH4+-N) removal performance of the carrier, while promoted total nitrogen (TN) depletion. Lower influent C/N ratio favored denitrification of the carrier. In addition, it was found that the enhanced removal of NH4+-N and TN in IFAS depended not only on the increase of carrier biomass, but also on the electrochemical activity of the novel carrier. Under the most effective conditions, the novel carrier could improve the TN removal efficiency by 19.7% compared with the activated sludge process.
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