连续流亚硝化中试反应器的启动及其能力提升

通过接种污水处理厂压滤后污泥,添加悬浮填料进行挂膜,采用连续流反应器处理模拟氨氮污水,对反应器的游离氨(FA)、游离亚硝酸(FNA)以及溶解氧(DO)进行调控,实现了中试亚硝化反应器的成功启动.结果表明,通过前期高DO,后期低DO的运行模式,并对反应器运行过程中的FA、FNA进行调控实现了AOB的富集和NOB的淘汰,启动成功后反应器内部亚硝酸盐产生速率(NPR)达到1.27 kg·(m~3·d)~(-1),亚硝酸盐积累率(NAR)也稳定在98%.采用实时荧光定量PCR方法(quantitative real time PCR,q PCR)对启动初期和成功启动后反应器中的功能微生物(AOB、NOB)进行分析,q PCR结果表明反应功能微生物AOB的拷贝数从启动初期的5.3×10~9copies·m L~(-1)增长到1.6×10~(11)copies·m L~(-1),NOB的拷贝数反而从1.1×10~(10)copies·m L~(-1)下降到1.2×10~9copies·m L~(-1),AOB拷贝数的数量级比NOB的要高2个数量级,这也是在启动过程中通过DO、FA、FNA等措施对NOB联合抑制的作用.

Start-up and Capacity Enhancement of a Partial Nitrification Pilot Reactor in Continuous Flow

The continuous flow reactor was used to treat simulated ammonia nitrogen wastewater by inoculating the sludge after filtration and adding a suspended filler. Regulations of free ammonia (FA), free nitrous acid (FNA), and dissolved oxygen (DO) in the reactor were the key to achieving a successful start-up of the pilot scale nitrosation reactor. The results show that the enrichment of ammonium oxidizing bacteria (AOB) and the elimination of nitrite oxidizing bacteria (NOB) are achieved by adjusting the operational mode of high DO, low DO, FA, and FNA in the reactor operation. The nitrite production rate (NPR) in the reactor was 1.27 kg·(m³·d)^-1 and the nitrogen accumulation rate (NAR) was stable at 98% at the end of the start-up period. qPCR was used to study the difference in the functional microorganisms (AOB, NOB) between the beginning and the end of the start-up period. The results show that the copy number of microbial AOB grew from 5.3×10⁹ copies·mL^-1 to 1.6×10¹¹ copies·mL^-1. The copy number of NOB decreased from 1.1×10¹⁰ copies·mL^-1 to 1.2×10⁹ copies·mL^-1, because of the joint regulation of DO, FA, FNA to suppress NOB.