摘要：

通过改变回流比和污泥龄(SRT)考察其对A/O-MBR脱氮除磷效果的影响,结果表明:在整个运行过程中,不同回流比对氨氮的去除率都在96%以上。提高回流比,使得反硝化过程不能完全进行,从而导致出水NO₃^--N升高,脱氮效率降低。而SRT对NH₄⁺-N、NO₃^--N和TN没有明显影响。此外,在SRT=30 d,回流比较低时(回流比为2),厌氧释磷作用较为明显,而提高回流比(回流比为3),反硝化聚磷过程得到强化,反应器均能达到较高的除磷效果(95%以上)。而当污泥中TP含量达到饱和时,增加SRT至60 d,并不能有效改善除磷效果。

关键词: A/O-MBR, 回流比, 污泥龄, 除磷

Abstract:

By means of changing the reflux ratio and sludge age solid residence time(SRT),their influences on den-itrification and dephosphorization effects in A/O-MBR have been investigated. The results demonstrate that during the whole operation period,all of the ammonia nitrogen removing rates by different reflux ratios is above 96%. Raising the reflux ratio makes the denitrification process unable to complete,which results in the increase of influent NO₃^--N,and decrease of denitrification effect. However,SRT does not have obvious influence on NH₄⁺-N、NO₃^--N and TN. In addition,when SRT is 30 d and reflux ratio is low(reflux ratio=2),the anaerobic phosphate releasing action is pretty obvious,while the reflux ratio is raised to 3,the denitrifying phosphate accumulation process can be enhanced. Moreover,the reactors can all reach higher dephosphorization effect(95%). When the TP content is saturatedin sludge,and SRT lengthened to 60 d, the dephosphorization effect cannot be improved effectively.

Key words: A/O-MBR, reflux ratio, solid residence time(SRT), dephosphorization

中图分类号: 

• X703.1