Abstract:

Stable nitrosation sludge was simultaneously seeded to two identical membrane bioreactors(MBR) under 21-25℃, to study the promotion effect of nano-CuO on autotrophic nitrogen removal process and performance. Results showed that Nano-CuO could effectively improve the autotrophic nitrogen removal performance and it could induce nitrosation sludge into full-process autotrophic denitrification sludge, which enable the coexistence of aerobic ammonia-oxidizing bacteria, anaerobic ammonia-oxidizing bacteria and denitrifying bacteria. 5 mg/L nano-CuO effectively increased the TN removal efficiency to more than 90%, and the reactor ran stably after stopping feeding nano-CuO. The nano-CuO on one hand released copper ions to simulate the enzymatic synthesis. On the other hand, it hindered oxygen transfer to form an anaerobic micro-environment and gathered together to provide carriers, thereby inducing and promoting the growth of anaerobic ammonia-oxidizing bacteria.

Key words: nano-CuO, Anammox, autotrophic nitrogen removal, membrane bioreactor, short-cut nitrification

摘要：

在21~25℃的条件下，接种稳定的亚硝化污泥至2个完全相同的膜生物反应器（MBR）中，考察纳米氧化铜对自养脱氮工艺脱氮性能的促进作用。结果表明，纳米氧化铜可有效提升自养脱氮性能，并可将亚硝化污泥诱导转变为全程自养脱氮污泥，使得好氧氨氧化菌、厌氧氨氧化菌及内源反硝化菌在该系统中共存。5 mg/L的纳米氧化铜可进一步提升总氮去除率至90%以上，停止添加后仍保持稳定运行。纳米氧化铜的加入一方面释放铜离子促进了酶的合成；另一方面阻碍氧传递形成厌氧微环境、并相互聚集提供载体，进而诱导并促进厌氧氨氧化菌的生长。

关键词: 纳米氧化铜, 厌氧氨氧化, 自养脱氮, 膜生物反应器, 亚硝化

CLC Number: 

• X703.1