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为实证某污水处理厂序批式活性污泥法(SBR)工艺升级改造效果,对设计方案进行了现场实验.分别研究了厌氧/好氧生物除磷、化学协同除磷工艺的处理效果,并据此进行了生产性实验.结果表明,前搅拌时当NO3--N的质量浓度降至3 mg/L以下时,聚磷菌才开始明显释磷;低曝气量厌氧释磷量远大于中曝气量时磷的厌氧释放量.PAC用于协同除磷效果较好,优化投加量为120 mg/L;化学协同除磷时投加PAC 1～2 d后才能使出水TP含量达标,投加PAC后对硝化细菌有较大影响,但经过3～4 d硝化作用恢复正常;投加PAC可大幅降低出水TP、SS,并且有效解决了冬季反应池表面浮渣问题.“,”In order to demonstrate the anticipated efficiency and find out unexpected problems after the forthcoming upgrading of the SBR in a WWTP,a field experiment was carried out.The experiment investigated the results of anaerobic/oxic biological phosphorus removal and chemical synergetic phosphorus removal.Then a full-scale experiment on the chemical synergetic phosphorus removal was also conducted afterwards.The results indicated that:phosphate accumulating organisms (PAO) began to release phosphorus obviously only after the mass concentration of NO3--N was lower than 3 mg/L during the anaerobic stage.The low aeration rate during the aeration stage led to far more phosphorus release during the anaerobic stage than the medium aeration rate did.The PAC phosphorus removal effect was better than other flocculants and the optimal dosage was 120 mg/L.The TP concent could meet the standard after 1 ～2 d of the addition of the PAC.PAC had an immediate adverse effect on nitrobacteria nevertheless the nitrification effect recovered after 3 ～4 d.Addition of PAC significantly decreased the effluent TP and S S,and could also efficiently prevent the accumulation of scum on the surface of SBR in winter.