粉末活性炭预吸附改善超滤膜通量试验研究

The Improvement of Ultrafiltration Membrane Permeation Flux by Powdered Activated Carbon Pretreatment

研究了粉末活性炭(PAC)预处理长江原水对改善超滤膜通量的效果。试验采用截留相对分子质量分别为30 000 Da和10 000 Da的2种超滤膜,着重探讨了PAC对长江水中不同分子量有机物的吸附去除效果以及其所带来的膜通量改善。试验结果表明,超滤膜直接过滤原水时,膜通量下降严重;采用PAC预吸附后,2种膜的通量在一定程度上均得到提高。对PAC预吸附和膜后水样进行不同相对分子质量有机物的测定,结果表明:PAC吸附小于1 000Da相对分子质量有机物高于其他相对分子质量区间有机物总和;膜表观截留孔径越小,PAC预吸附改善膜通量效果越显著。

The effect of the pre-adsorption of Yangtze river water by powder activated carbon （PAC） on the utrafihration membrane permeation flux was studied in this paper. Two kinds of utrafihration membrane were used in this experiment, with the molecular weight cutoff of 30 000 and 10 000 Da, respectively. The efficiency of PAC adsorption on organic compounds with different molecular weight and the improvement effects of the membrane flux were emphatically discussed. The experimental results showed that in the filtration of raw water without PAC pretreatment, the membrane flux declined rapidly. With the PAC pre-adsorption, the fluxes of the two kinds of membrane were improved to some extent. Organic compounds with different molecular weight in the PAC pre-adsorption effluent and membrane effluent were determined, and the results showed that the amount of organic compounds with less than 1 000 Da was higher than the total amount of organic matters with the molecular weight in other range. The smaller pore size of membrane was, the better improvement of permeation flux by PAC pretreatment could be observed.