动态膜微滤含污泥水及膜污染特征  

Microfiltration of Sludge-containing Wastewater by Dynamic Membrane and Characteristics of Membrane Fouling

作　　者：李俊[1] 奚旦立[2] 石勇[1] 吴锡慧[1] 

机构地区：[1]上海应用技术学院化工系,上海200235 [2]东华大学环境科学与工程学院,上海200051

出　　处：《过程工程学报》2008年第3期478-483,共6页The Chinese Journal of Process Engineering

基　　金：上海市重点学科基金资助项目(编号:p1501);上海市教委基金资助项目(编号:06-OZ-003)

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2.0m/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30min后,出水浊度基本为0;60min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%(ω);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4370mg/m2,Ca,Mg是主要无机污染元素,分别约1240和886mg/m2.先后用0.2mol/L的NaOH水溶液和0.1mol/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%.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 offwhen 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/m^2, the main inorganic foulant elements calcium and magnesium were 1240 and 886 mg/m^2 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.

关 键 词：高岭土 动态膜 含污泥水 错流微滤 

分 类 号：TQ028.8[化学工程]