摘要：Using the method of ultrafiltration, the raw water of the Nanchang section of Ganjiang River and the waterafter conventional treatment was estimated to determine the molecular weight distribution. The results showedthat the raw water of Ganjiang River has a molecular weight distribution with large edges and small middleparts, which meant that the organic matter of the water mainly centralized in a scope where the moleculeswere larger than 30ku or less than 1ku, and the middle size matter occupied a relatively small proportion. Inwinter low-water season, there was little organic matter in the river and the small organic matter moleculesplayed the dominant role. Meanwhile, in the season of high-water, the amount of organic matter increased,whereas the small organic matter molecules decreased and the large organic matter molecules becamedominant. The ordinary water purifying process of Nanchang city was just to remove the large molecules ofthe organic matter mainly, which led to an unsatisfying result where the small molecules were barely removed.
