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《Journal of Beijing University of Technology》 2008-05
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Effect of Internal Recycle on the Nitrogen Removal of an A~2/O Process

WANG Jian-long PENG Yong-zhen GAO Yong-qing (College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100022,China)  
Determining the most favourable recycle ratio is an important item in A~2/O process operational optimization.In this work,feeding with sewage,the effect of recycle ratio on nitrogen removal when using different influent nitrogen loads was tested in an A~2/O process,which available capacity was 52 L. Experimental results showed that increasing the internal recycle ratio from 0 to 6 produced a 14.0% increase in nitrogen removal.This increase was achieved by improvingρ(NO_x~--N)removal efficiency of 10.2% with an increase inρ(NH_4~+-N)removal efficiency of 3.8%.In order to stabilitate the effluent total nitrogen concentration and reduce operational cost,internal recycle ratio should be increasing with influentρ(NH_4~+-N) loading.The optimal internal recycle ratio is 2 in general.
【Fund】: 海外青年学者合作研究基金项目(50628808);; 高等学校博士学科点专项科研基金(200600050002);; 北京市属市管高等学校人才强教“创新团队”资助项目(05005013200504);; 北京市教委科研基地——科技创新平台项目.
【CateGory Index】: X703
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