Study on Short-cut Nitrification Control Method of Municipal Wastewater at Medium and Low Temperature
Short-cut nitrification can save energy and increase efficiency of wastewater treatment plants,but achieving short-cut nitrification at medium and low temperature is still the bottleneck of the application of this process.In this paper,the start-up of short-cut nitrification at 8～16 ℃ was investigated with addition of four iron-based materials(Fe2O3 nanoparticles(NPs),Fe3O4 NPs.magnetite NPs and FeCl3)using actual municipal sewage as influent.The results showed that the addition of 50 mg/L Fe2O3 NPs can achieve nitrite accumulation ratio(NAR)of more than 75％within ten days,while NAR reached as high as 100％with addition of 145 mg/g MLSS FeCl3.The results of high-throughput sequencing showed that iron-based materials affected microbial community structure of activated sludge in the reactors.Nitrosomonas was the dominant ammonia-oxidizing bacteria(AOB)and Nitrospira was the dominant nitrite-oxidizing bacteria(NOB).Compared with the control group,the relative abundance of NOB in the experimental groups decreased by an average of 68.48％.The addition of iron-based materials caused selective inhibition of NOB,which resulted in the successful achievement of short-cut nitration at medium and low temperature.PLS-PM analysis further verified the regulatory pathway of NO2--N accumulation by iron-based materials.A short-cut nitrification control method for municipal wastewater at medium and low temperature by adding iron-based materials was established.
iron-based materialsSBRmedium and low temperatureshort-cut nitrification
万方数据
维普
