The A/O-MBR process has been applied to the treatment of digested piggery wastewater, for which chemical flocculation is used as pre-treatment. The results show that the average removing rates of soluble COD and TP by chemical flocculation are 18.9% and 61.3% .respectively. In the A/O-MBR process,the removing efficiencies of effluent soluble COD and ammonia-nitrogen are pretty good,under the following conditions: the DO is 3 mg/L and MLSS 4-5 g/L. Their average removing rates are 70.6% and 99.4%,respectively. But,the TN removing rate is lower than 30%. During the start-up period,the transmembrane pressure difference increases rapidly with the increase of pollutant concentration,resulting in rapid membrane fouling. However,when the system runs steadily,the trend of membrane fouling gets much slower.%以化学絮凝作为预处理,采用A/O-MBR工艺处理养猪沼液.结果表明,化学絮凝对溶解性COD和TP的平均去除率分别为18.9％和61.3％; A/O-MBR在溶解氧为3 mg/L、MLSS为4～5g/L的条件下,出水溶解性COD和氨氮的去除效果较好,平均去除率分别达到70.6％和99.4％；而TN的去除率则低于30％.启动期间,当污染物浓度增加时跨膜压差迅速增加导致膜污染加剧,而当系统稳定运行时,膜污染趋势大大减缓.
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