Study on Nitrification Characteristics of Livestock Wastewater Treated With SBR

By coupling intermittent characteristics of livestock wastewater and intermittent operation of SBR, the feasibility of using intermittent aeration to reduce energy consumption of livestock wastewater treatment facilities was studied. SBR was utilized to treat livestock wastewater pretreated by the anaerobic process. A systematic study of the start-up of nitrification in SBR using the novel aeration method and the influence of aeration rate and aeration time on nitrification performance was carried out. The results showed that the removal of NH4+-N could be achieved under different operating conditions. DO concentration was the dominant factor affecting the nitrification process. Under the operation condition of stage 3 (i. e. aeration rate 0.8 L/min, temperature 25 °C, aeration time 12 h). Because of the lack of carbon source, the removal rate of TN decreased, and a certain degree of accumulation of NO3--N occurred. Through monitoring the DO, pH and Eh, the results indicated that the Eh curves varied irregularly. However, DO and pH in one operating cycle showed obvious patterns and corresponded well with the nitrification process, so they could be used as real-time control parameters to control the nitrification aeration process.