Abstract: The performance of kaolin dynamic membrane (DM) formed on ceramic membrane was studied in detail in treatment of sludge-containing wastewater. The effects of cross-flow rate, thansmembrane pressure and concentration of mixed liquid suspending solid (MLSS) on the flux and quality of fitrate were examined. The results indicated that the flux of filtrate increased with increase of cross-flow rate and transmembrane pressure, while increase of concentration of MLSS led to decrease of the flux. DM may be brushed off when cross-flow rate was greater than 2.0 m/s. Filtrate turbdity would be nearly zero in the first 30 min, and chemical oxygen demand removal would be 50% in an hour for the most part. The resistance of DM and held foulant accounted for 90% of the total filtration resistance. Based on analysis of the foulant attached on the DM surface, it was found that phosphorus and calcium were the main foulant elements, their mass contents were 23.77% and 20.60% respectively. Total organic carbon was about 4370 mg/m2, the main inorganic foulant elements calcium and magnesium were 1240 and 886 mg/m2 respectively in the fouled ceramic membrane through analysis of the extractant of fouled ceramic membrane. The flux of filtrate could restore to 85% of the clear ceramic membrane through chemical washing with 0.2 mol/L sodium hydroxide aqueous solution and 0.1 mol/L hydrogen chloride aqueous solution in series.

Key words: kaolin, dynamic membrane, sludge-containing wastewater, crossflow microfiltration

摘要： 以陶瓷管为载体，对高岭土动态膜微滤含污泥水性能及膜污染特征进行了较为详细的研究. 考察了错流速度、跨膜压差及污泥浓度对滤出液通量及水质的影响，结果表明，提高错流速度和增大跨膜压差均使滤液通量增加，但错流速度超过2.0 m/s易引起动态膜脱落；污泥浓度增加，则滤液通量明显降低；过滤进行约30 min后，出水浊度基本为0；60 min后，化学需氧量的去除率基本保持在50%以上. 动态膜层及其截留的污染物阻力占总过滤阻力的90%以上. 对膜面特征污染物成分分析表明，P, Ca为膜面主要污染元素，分别占23.77%和20.60%(w)；对陶瓷膜孔中不可逆污染物的化学洗脱液分析表明，膜中总有机碳近4370 mg/m2，Ca, Mg是主要无机污染元素，分别约1240和886 mg/m2. 先后用0.2 mol/L的NaOH水溶液和0.1 mol/L的HCl水溶液清洗膜中不可逆污染物，可使基膜通量恢复至新膜的85%.

关键词: 高岭土, 动态膜, 含污泥水, 错流微滤