以二次纤维企业生物处理二级出水为对象，通过田口试验设计和方差分析法 ( ANOVA) ，考察了聚合氯化铝( PAC) 投加量、阳离子聚丙烯酰胺( CPAM) 投加量、 pH 和 温度对膜前混凝过程的影响，确定混凝预处理的最佳工艺条件: PAC 投加量为 1000mg/L， CPAM 投加量为 20 mg/L， pH 为 9，温度为 25 ℃． 在此工艺条件下，废水化学需氧量 COD 值下降至441mg/L，总悬浮物 TSS 为4 NTU，污泥体积系数 SV 为 46，色度为 23 Units PtCo． 在此基础上进行废水的直接膜分离和经混凝预处理后的膜分离实验，研究结果表明， 与未经混凝预处理相比，二沉池出水经混凝预处理后，超滤处理 10 min，膜通量衰减至 70%，废水 COD 去除率达到60． 2%． 这说明混凝法作为膜分离的预处理工艺能提高二次 纤维废水膜处理的整体性能．

The effects of individual membrane processing ( MP) and MP combined with coagulationflocculation ( CF) on the properties of secondary fiber wastewater had been investigated in this study． Based on taguchi method and analysis of variance ( ANOVA) ，four independent variables including PAC dosage，CPAM dosage，pH and temperature were selected as influence factors． The factors were optimized as PAC dosage 1000mg/L，CPAM dosage 20mg/L，pH 9 and temperature 25 ℃． At the optimal conditions，COD was declined to 441 mg/L，TSS was 4NTU，SV was 46，colority was 23 Units PtCo． Compared with individual MP， the combination of CF and MP has a higher flux at 70% and a stronger removal of COD at 60. 2% after 10 mins’MP， indicating that the combination of CF-MP improves the overall performance for the secondary fiber wastewater treatment．