不同回流比和SRT对A/O-MBR脱氮除磷的影响  

Influences of different reflux ratio and SRT on denitrification and dephosphorization in A/O-MBR

作　　者：王德美[1] 王晓昌[1] 唐嘉陵[1] 夏四清[1,2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]同济大学环境科学与工程学院,上海200092

出　　处：《工业水处理》2016年第1期55-58,共4页Industrial Water Treatment

基　　金：水体污染与治理科技重大专项(2013ZX07310);陕西省污水处理与资源化重点科技创新团队(2013KCT-13);城市内湖氮磷去除及富营养化控制技术研究(2013ZX07310-001);城市污水处理设施升级改造及资源化利用技术(CX12160)

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。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 saturated in sludge, and SRT lengthened to 60 d, the dephosphorization effect cannot be improved effectively.

关 键 词：A/O—MBR 回流比 污泥龄 除磷 

分 类 号：X703.1[环境科学与工程—环境工程]