Effectiveness and mechanism of nitrate in wastewater plant tailwater to inhibit recurrent black-odorous rivers
Preventing the return of black-odorous rivers is the key to improving the ecological environment of urban rivers.This study investigated the effect of nitrate(NO3-)in the tailwater of wastewater treatment plants on the black-odorous return of the water body,explored the changes of nitrogen and sulfur under the action of NO3-in the tailwater of wastewater treatment plants,and analyzed the mechanism of the inhibition of the black-odorous return of the water body under the action of NO3-in the tailwater of wastewater treatment plant.The results showed that the DO and ORP of the overlying water were significantly enhanced by NO3-activated wastewater tail water,NH3-N was reduced to 0.9 mg/L on the 90th day,and the AVS of the substrate was reduced by 45.5％,which reduced the potential risk of black-odorous in the water body.Analysis using ampli-con sequencing revealed a significant increase in the abundance of the sulfur-oxidizing bacteria Thiobacillus,Bosea,Nitrobacter and Pseudomonas and a significant decrease in the abundance of the sulfate-reducing bacteria Desulfobacterium and Syntrophus,in the sediment under the action of NO3-in the tailwater of the wastewater treatment plant.The abundance of denitrifying bacteria such as Sterol ibacterium,Denitratisoma and Silanimonas also increased.
Wastewater treatment plantBlack-odorous riversMicroecological environmentSulfur-autotrophic denitrificationMicrobiological community structure
万方数据
维普
