基于不同污泥量间歇饥饿的CANON工艺启动

Research on CANON process startup based on intermittent starvation of different sludge amount

为了探究不同污泥量间歇饥饿对于全程自养脱氮(CANON)工艺启动的影响,R1、R2和R3反应器分别采用水力筛分间歇饥饿、部分污泥间歇饥饿和全部污泥间歇饥饿3种不同的方式启动CANON工艺.结果显示,R1、R2和R3反应器分别在第44,66和58d顺利启动,第70d时,其总氮去除率分别达到73.63%、71.56%和67.40%左右,粒径分别达到了404,359和306μm.分析表明,水力筛分间歇饥饿方式可以选择性地针对絮状污泥进行饥饿,避免间歇饥饿对于污泥EPS及粒径的负面影响,在有效抑制NOB菌活性的同时易于保持相关功能菌的活性;部分污泥间歇饥饿的方式在一定程度上避免了AOB和ANAMMOX活性的衰减,但同时NOB的抑制效果也较差;整体间歇饥饿策略对于NOB的抑制效果最好,但同时也不利于CANON工艺相关功能菌的活性保持.

In order to explore the influence of intermittent starvation of different amounts of sludge on the start of CANON process,the R1,R2 and R3 reactors used three different methods to start CANON process by hydraulic screening intermittent starvation,partial sludge intermittent starvation and all sludge intermittent starvation.The experimental results showed that the R1,R2,and R3 reactors were successfully started on the 44,66,and 58 d,respectively.On the 70 th day,the total nitrogen removal rate reached 73.63%,71.56%,and 67.40%,and the particle size reached 404,359 and 306μm,respectively.Analysis showed that the hydraulic screening intermittent starvation method could selectively starve the flocculent sludge,avoid the negative impact of intermittent starvation on the EPS and particle size of the sludge,and can effectively inhibit the activity of NOB bacteria while easily maintaining the activity of related functional bacteria.The intermittent starvation method of some sludge avoided the attenuation of AOB and ANAMMOX activity to a certain extent,but at the same time the inhibition effect of NOB was also poor;the overall intermittent starvation strategy had the best inhibitory effect on NOB,but it was also not conducive to the CANON process.The activity of related functional bacteria was maintained.