论文部分内容阅读
分析了浸没式超滤膜处理西江水的净水效能及运行稳定性,探讨了超滤膜化学清洗的效果。结果表明,原水分别经过混凝沉淀—超滤和混凝沉淀—砂滤—超滤两种工艺处理后,出水水质均有很大提升,出水平均浊度分别为0.07、0.06 NTU;中试运行过程中,对COD_(Mn)的平均去除率为20%,略优于常规处理工艺;出水中均未检测到剑水蚤、红虫等微型动物。对超滤膜进行化学清洗后跨膜压差恢复显著,清洗后TMP_(20℃)由33 k Pa降至16 k Pa。两种工艺的TMP_(20℃)平均增长速率分别为0.33、0.10 k Pa/d,超滤膜系统的跨膜压差增长缓慢,运行相对稳定。
The effect of immersion ultrafiltration membrane on water purification and operation stability of Xijiang River was analyzed. The effect of chemical cleaning of ultrafiltration membrane was discussed. The results showed that after the raw water was treated by coagulation and sedimentation - ultrafiltration and coagulation and sedimentation - sand filtration - ultrafiltration respectively, the water quality of the effluent increased greatly with average turbidity of 0.07 and 0.06 NTU, respectively. The trial operation During the process, the average removal rate of COD Mn was 20%, which was slightly better than that of the conventional treatment process. No micro-animals such as Siphonaptera, red worm and so on were detected in the effluent. The transmembrane pressure drop recovered significantly after chemical cleaning of the ultrafiltration membrane. The TMP 20 ° C decreased from 33 kPa to 16 kPa after cleaning. The average growth rates of TMP (20 ℃) of the two processes were 0.33 and 0.10 kPa / d, respectively. The transmembrane pressure drop of the ultrafiltration membrane increased slowly and the operation was relatively stable.