基于ANAMMOX的养猪场废水亚硝化过程研究

Research on ANAMMOX-based Nitrosation Process for Treatment of Piggery Wastewater

以高氨氮、高有机物浓度的养猪场废水为处理对象,在室温(25℃)、不调节pH的条件下,研究了基于厌氧氨氧化(ANAMMOX)的亚硝化过程。结果表明:在进水氨氮浓度约为550mg/L、COD浓度为1 000~1 300 mg/L的条件下,亚硝化效果稳定。反应8~10 h后,出水中的氨氮和亚硝酸盐氮浓度之比可达(1∶1)^(1∶1.20),对氨氮和COD的去除率分别为58.3%~65.6%和59.2%~68.6%,亚硝化率在整个过程中均保持在97%以上。随着曝气量的增大,达到厌氧氨氧化工艺所需进水氨氮/亚硝酸盐氮的反应时间(τ)缩短,τ时刻出水的pH值为7.8~8.1;氨氮和COD的降解均遵循一级反应动力学,反应速率常数分别为0.065 6~0.072 4 h-1和0.049 1~0.066 4 h-1。

Taking piggery wastewater with high ammonia nitrogen and organic concentrations as treatment object, the ANAMMOX-based nitrosation process was investigated under the condition of ambient temperature of 25 ℃ and constant pH. The results show that the nitrosation is stable when the influent concentrations of ammonia nitrogen and COD are 550 mg/L and 1 000 to 1 300 mg/L, respectively. After an 8- to 10-h reaction period, the ratio of the effluent ammonia nitrogen to nitrite nitrogen reaches 1 ： 1 to 1 ： 1.20, the removal rates of ammonia nitrogen and COD are 58.3% to 65.6% and 59.2% to 68.6% , respectively, and the nitrosation rate throughout the process maintains above 97%. As aeration rate increases, the hydraulic retention time which meets the ratio of the influent ammonia nitrogen to nitrite nitrogen required for ANAMMOX is shortened, and the effluent pH after the HRT is 7.8 to 8.1. The degradation of ammonia nitrogen and COD follows first-order reaction kinetics. The reaction velocity constants of ammonia nitrogen and COD are 0.065 6 to 0. 072 4 h^- 1 and 0. 049 1 to 0. 066 4 h^- 1, respectively.