Study on advanced denitrification technology of sulfur-based autotrophic denitrification
The effects of hydraulic retention time,influent nitrate concentration,and pH value on the denitrification of sulfur autotrophic denitrification and the denitrification efficiency of the autotrophic and heterotrophic denitrification system constructed by adding organic carbon sources were studied.The results showed that the optimal process conditions for sulfur autotrophic were influent nitrate concentration of 30 mg/L,hydraulic retention time of 2 h,pH value of 7,nitrate removal rate of 97.23%,and volume load of 0.35 kg/(m3·d).When the carbon source is increased to form a sulfur autotrophic and heterotrophic denitrification system,the nitrate removal rate can reach 99.59%,and the volume load can reach 0.52 kg/(m3·d),indicating that sulfur autotrophic and heterotrophic denitrification have a synergistic effect.Proteobacteria are the main phylum involved in the process of sulfur autotrophic and heterotrophic synergistic denitrification,accounting for about 85.33%.Iron oxidizing bacteria are the main genus involved in the denitrification process.
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