微滤膜处理长江重庆段原水的初步研究

Experimental Research on Purifying Raw Water of Yangtze River in Chongqing Region with Tubular Micro-filtration Membrane

不进行预处理,用两种不同数量级孔径的微滤膜处理长江上游重庆段原水,发现4～10μm孔径聚乙烯微滤管浊度去除率低,出水浊度高,0.2～0.9μm孔径超高分子量聚乙烯微滤管浊度去除率高,出水浊度小于3NTU。采用2m高位水箱进水方式,大流量有压空气反吹辅以原水排污的在线物理清洗能使0.2～0.9μm孔径膜保持长时间稳定通量运行。通过该试验,确定了0.2～0.9μm孔径微滤膜处理长江上游重庆段原水的设计运行参数。

Without any pretreatment, the raw water of Yangtze River in Chongqing region was filtrated in this experiment by micro-filtration membranes of two different pore size. It is found that the turbidity of filtrate permeating the tubular ultra-high molecule polyethylene micro-membrane of 0.2-0.9 μm pore size is much lower than that permeating the membrane of 4-10 μm pore size and less than 3NTU, the turbidity removal efficiency is much higher than the latter membrane. It is also found that the former membrane can keep steady flux for a long time by on-line physical cleaning method with feeding pattern of 2 m high-elevated water tanks. The method means that fouling, air and raw water is discharged via a drainage valve periodically when pressurized air current at high flow rate permeates the membrane in the opposite direction of the raw water inflow. Finally, the design and operation parameters of 0.2-0.9 μm pore size in disposing raw water of Yangtze River in Chongqing region is obtained in the experiment.