不同搅拌方式对厌氧氨氧化污泥复壮及运行影响

Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge

为研究在常温(21±1)℃条件下不同搅拌方式对于厌氧氨氧化污泥复壮及运行影响,采用3组反应器(R1、R2、R3)搅拌方式分别为连续搅拌、间歇搅拌、间歇搅拌方式(R2、R3转速不同),对系统复壮及运行过程的脱氮性能、颗粒污泥性能等进行分析.结果表明,R1、R2、R3分别用10,2,2 d的时间氨氮、亚硝酸盐氮去除率接近100%,R2、R3的厌氧氨氧化速率更高,更适合厌氧氨氧化菌生长;周期实验结果可知,间歇搅拌方式形成的水流流化状态较弱,使反应器呈较低溶解氧的时间较长,更易抑制AOB活性,从而提高厌氧氨氧化菌活性;R1系统提供剪切力大,且持续与基质溶液接触,产生EPS多,稳定运行时期末,R1、R2、R3的颗粒污泥平均粒径为723,675,649μm.

In this experiment,the effects of different stirring methods on the rejuvenation and operation of anaerobic ammonium oxidation sludge under normal temperature(21±1)℃conditions were investigated.Three groups of reactors(R1,R2,and R3)were studied,and the stirring methods were continuous stirring for R1 and intermittent stirring with different rotation speeds for R2 and R3.The denitrification performance and the performance of granular sludge during system rejuvenation and operation process were analyzed.Results show that the removal rates of ammonia nitrogen and nitrite nitrogen of R1,R2,and R3 were close to 100%in 10,2 and 2 d,respectively.The anaerobic ammonium oxidation rates of R2 and R3 were higher,which were more suitable for the growth of anammox bacteria.According to the results of cycle test,the fluidization state of the water flow formed by the intermittent stirring method was weak,so that the reactor had lower dissolved oxygen for a longer period,and it was easier to inhibit the activity of AOB,thereby increasing the activity of the anammox bacteria.The R1 system provided strong shearing force and had continuous contact with the substrate solution,resulting in more EPS.At the end of the static operation phase,the average particle size of granular sludge in R1,R2,and R3 was 723,675 and 649μm,respectively.