Research Progress of Electron Donors and Functional Genes for Sulfur Autotrophic Denitrification in Waste water Treatment
Nitrogen pollution has become an increasingly serious problem due to the discharge of nitrogen containing waste water and the extensive use of nitrogen containing fertilizers.Biological denitrification is one of the main treatment technologies for waste water denitrification because of the high efficiency,low cost and environmental friendliness of biological treatment.Sulfur autotrophic denitrification has received widespread attention because it does not require an additional carbon source and produces less sludge.In this paper,progress of denitrification by elemental sulfur,sulfide and thiosulfate as electron donors are introduced,the metabolic pathways and influence mechanisms of sulfur autotrophic denitrification are explored,and an overview of several influencing factors for sulfur autotrophic denitrification is given.On this basis,sulfur autotrophic denitrification bacteria as well as several types of functional genes of denitrification such as nar,nir,nor and nos are analyzed,with a view to offering an outlook on the development of denitrification processes and co-location technologies.
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维普
