期刊
CHEMOSPHERE
卷 212, 期 -, 页码 881-889出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.08.162
关键词
Azo dye; Hydrolysis acidification; Multiple anoxic/aerobic; Color removal; Nitrogen removal
资金
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2017ZX07205-01]
- Development and Reform Commission of Shenzhen Municipality (urban water recycling and environment safety program)
- Environment Research and Technology Development Fund (ERTDF) by Ministry of the Environment, Government of Japan [5-1653]
Dye wastewater is one kind of refractory pollutant and it is commonly treated by the integrated anaerobic and aerobic process. A new integrated hydrolysis/acidification and multiple anoxic/aerobic (AO) process was proposed for the removal of color and nitrogen from azo dye wastewater. System performance, the degradation pathway of azo dye and nitrogen metabolic pathway were investigated with quadrupole-time-of-flight and metagenomic analyses. The proposed process removed color and nitrogen efficiently, with the removal percentages of 89.4% and 54.0%, respectively. A colorful intermediate C16H11N3O7S2 during the degradation of azo dye was detected. Controlling a low dissolved oxygen concentration in the multiple AO process could enhance nitrogen removal. The detected bacteria possessing azoreductase for the azo dye degradation included Desulfovibrio aminophilus, Thermoanaerobacter, Lactococcus raffinolactis, Ruminiclostridium and Rhodopirellula. The nitrifying genes of amo and hao were mainly detected in Nitrosomonas, while the denitrifying genes were detected in Thauera, Candidatus Accumulibacter and Rhodothermus marinus. (C) 2018 Elsevier Ltd. All rights reserved.
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