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以模拟生活污水为处理对象,重点研究了在硝化液回流比(α)为100％,内循环回流比(R)分别为100％、150％、200％条件下A3/O-MBR工艺脱氮除磷特性.结果表明,内循环回流比对COD、NH4+-N和TN去除影响较小,COD、NH4+-N和TN平均出水分别小于50、2和20 mg/L,去除率分别保持在95％、97％和70％以上.TP去除率随回流比增大而增大,在进水平均TP质量浓度为4.26、7.68和7.70 mg/L条件下,平均TP出水质量浓度分别为1.67、1.31、0.99 mg/L,去除率分别为60.80％、82.94％和87.14％.同时增大内循环回流比有利于厌氧区磷的释放及缺氧Ⅱ区磷的吸收,释磷量由0.252 g/d增加至1.864 g/d,吸磷量由0.108 g/d增加至2.160 g/d.“,”Using the synthetic domestic sewage as treatment object,focused on the A3/O-MBR process characteristics ofdenitrification and phosphorus removal when nitrate recycling ratio (α) of 100％,and internal return ratio (R) as 100％,150％,200％ respectively.The results showed that the removal rates of COD,NH4+-N and TN are almost not influenced by the change of internal recycle ratio,and the effluent concentrations of COD,NH4+-N and TN less than 50,2,20 mg/L respectively.As while as the average removal efflciencies more than 95％,97％ and 70％,respectively.However,the removal efflciencies of TP increased with the increasing of the internal recycle ratio.The average influent concentration of TP was 4.26,7.68 and 7.70 mg/L and the effluent concentration of TP was 1.67,1.31,0.99 mg/L respectively.The removal efficiencies of TP were 60.80％,82.94％ and 87.14％,respectively.Meanwhile the release and uptake of phosphorus in the anaerobic zone and anoxic zone Ⅱ was increased with the increasing of internal recycle ratio,and the release rate increased from 0.252 g/d to 1.864 g/d,the uptake rate increased from 0.108 g/d to 2.160 g/d.