CANON反应器运行稳定性及温度冲击的影响

Performance Stability of CANON Reactor and Temperature Impact

为考察长期运行条件下全程自养脱氮(CANON)反应器的运行效果,以人工配置无机高氨氮废水为进水,研究了连续流CANON反应器的运行稳定性.CANON反应器在控制内部温度为35℃±1℃,pH 7.39～8.01,水力停留时间3.7～5.1 h条件下,稳定运行超过1 a,短程硝化性能与厌氧氨氧化性能均获得稳定,平均TN去除负荷达到1.8 kg.(m3.d)-1,平均TN去除率为65.09%,最大TN去除率可达81.65%.低温冲击时,虽然ANAMMOX菌与AOB都会受到低温的抑制,但由于ANAMMOX菌对低温更加敏感,受到的抑制更加严重,因此造成NO2--N严重积累.温度恢复35℃后,CANON反应器性能很快恢复正常,短暂的低温冲击不会对CANON反应器稳定性构成显著影响;当经历超过50℃以上的高温冲击时,尽管AOB可在1周内恢复正常,但ANAMMOX菌的活性被完全破坏,使CANON反应器彻底崩溃,应予以避免.

In order to study long-term effect of completely autotrophic nitrogen removal over nitrite（CANON） reactor,performance stability was investigated by using synthetic inorganic ammonia-rich wastewater as raw water with a continuous flow CANON reactor.Both performances of short-cut nitrification and ANAMMOX were stable for more than one year.Under the condition that inner temperature at 35℃±1℃,pH 7.39 and 8.01,and hydraulic retention time 3.7-5.1 h,the average total nitrogen removal load was 1.8 kg·（m3·d）-1,and the average and maximum total nitrogen removal efficiency were 65.09% and 81.65% respectively.Under sudden low temperature conditions,both ANAMMOX bacteria and AOB were inhibited,however,the ANAMMOX bacteria were inhibited more,which caused highly accumulated nitrite.When temperature increased to 35℃ as normal,the performance of CANON reactor recovered soon,which means low temperature impact will have no significant influence on stability.When the temperature reached more than 50℃,the activity of ANAMMOX bacteria was completely destroyed,so high temperature must be avoided,though AOB can recovered to normal in one week.