组件孔径对次毫米过滤的影响

Effect of Module Pore Size on Sub-millifiltration

[目的]通过自主研制一种次毫米过滤组件以实现高浓度污泥的折中分离。[方法]以获得平均浓度2.0～4.0 g/L污泥为目标,研究了5种不同孔径(0.10、0.30、0.47、0.80、1.00 mm)的组件对次毫米过滤的平均通量及滤出液污泥浓度(MLSS)的影响。[结果]不同孔径的组件均可实现不同程度的污泥分离。组件孔径由0.10 mm增大到1.00 mm时,平均通量表现为先增大后减小的趋势,在孔径0.80 mm时达到最大值,为353.7 L/(m2.h)。就试验目标而言,孔径0.47 mm的组件效果最佳,运行40 min后得到平均污泥浓度为3.1g/L,对应的平均通量为282.3 L/(m2.h),为膜运行通量的30～60倍。[结论]组件孔径对滤出液MLSS及过滤通量的影响较大,0.47mm孔径的组件较符合污泥折中分离的需要,且在该组件孔径下滤出液MLSS随时间的变化较稳定。

[Objective] The study aimed to achieve the compromise separation of the sludge with high concentrations through using a self-developed sub-millimeter filtering module.[Method] With achieving the average sludge concn.（MLSS） of 2.0-4.0 g/L as the object,the effects of 5 modules with different pore sizes（0.10,0.30,0.47,0.80,1.00 mm）on the mean flux and filtrate MLSS of sub-millifiltration（SMF） were investigated.[Result] The modules with different pore sizes could achieve the sludge separation to different extent.When the pore size was ascended from 0.10 mm to 1.00 mm,the average flux exhibited a trend of firstly increasing and then decreasing,with the highest value of 353.7 L/（m2·h） at 0.80 mm pore size.As for the design value（2.0-4.0 g/L）,the module with the pore size of 0.47 mm was considered to be the best choice,because it achieved the average sludge MLSS of 3.1 g/L after moving for 40 min and its the corresponding average flux was 282.3 L/（m2·h） which was 30-to 60-fold higher than that of film movement.[Conclusion] The pore size of module had greater effects on the filtrate MLSS and the mean flux.The module with the pore size of 0.47 mm better accorded with the needs of compromise separation of the sludge and the filtrate MLSS was relatively stable with the time change at this pore size of the module.