Review of heterotrophic-sulfur autotrophic synergistic denitrification technology
The basic characteristics of heterotrophic-sulfur autotrophic denitrification technology were in-troduced.Traditional heterotrophic denitrification has high operating costs and high sludge production,while sulfur autotrophic denitrification has disadvantages such as low denitrification efficiency and alkalin-ity consumption,which can be complemented by coupling the two processes.Heterotrophic-sulfur auto-trophic denitrification is one of the most promising and economical processes for treating low C/N ratio wastewater,which has the advantages of low cost,low SO2-4 production,pH stabilisation,and high efficien-cy of denitrification,etc.The synergistic mechanism,microbial community characteristics,and influencing factors were elaborated,and the practical application of this process in urban tailwater,groundwater,and other wastewaters with low C/N ratio was illustrated.At the same time,the existing problems at this stage were summarised and the future research directions were outlooked to provide theoretical reference for the promotion and practical application of this technology.
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