摘要：

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4～5 g/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。

关键词: 膜生物反应器, 养猪沼液, 膜污染

Abstract:

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.

Key words: membrane bioreactor, digested piggery wastewater, membrane fouling

中图分类号: 

• X703.1