预处理对阈通量的影响

Effects of different pretreatments on threshold flux

摘要:

选择合适的阈通量是超滤膜在城市水处理工艺应用成功与否的关键问题之一,为此,使用聚偏氟乙烯(PVDF)过滤原水、混凝水、沉后水和滤后水,通过通量循环法求解不同水质的阈通量,分析不同预处理对阈通量的影响．结果表明:原水的有机物和浊度高,不可逆阈通量为11 L/(m²·h);通过混凝沉淀沙滤后,不可逆阈通量大于55 L/(m²·h)．过滤沉后水和滤后水的阈通量相似,建议在沉后直接安装超滤设备．

Abstract:

As for the application of ultrafiltration in water treatment process, one of the key points is the selection of suitable threshold flux. Based on the needs of ultrafiltration in water works, four kinds of water sources including raw water, water during coagulation, water after sedimentation and water after sand leach were used. The effects of different pretreatment on threshold flux obtained from flux cycling method were compared and analyzed. The irreversible threshold flux of raw water was 11 L/(m²·h), which was due to high organic maters and turbidity. The irreversible threshold flux of water after sand leach was higher than 55 L/(m²·h), which was similar to that of water after sedimentation. It is suggested that the ultrafiltration membrane system can be installed after sedimentation.