CAJ | 학술논문

采用一种往复旋转中空纤维膜超滤装置处理脱脂奶水溶液,考察了该膜过滤装置的结构参数、膜组件旋转参数以及料液的特征参数等对膜渗透通量衰减的影响。结果表明,旋转角速度越大,膜丝距中空轴轴心越远,往复旋转中空纤维膜的剪切强化作用越好;往复旋转周期的优化则需考虑如何使料液流场流速与膜丝转速之间的矢量迭加在膜表面产生的速度梯度更大,单纯增大或减小旋转周期均会弱化剪切强化的效果。在同样操作参数下,往复旋转方式比死端过滤及单向旋转方式的膜过滤更利于延缓膜通量衰减。
채용일충왕복선전중공섬유막초려장치처리탈지내수용액,고찰료해막과려장치적결구삼수、막조건선전삼수이급료액적특정삼수등대막삼투통량쇠감적영향。결과표명,선전각속도월대,막사거중공축축심월원,왕복선전중공섬유막적전절강화작용월호;왕복선전주기적우화칙수고필여하사료액류장류속여막사전속지간적시량질가재막표면산생적속도제도경대,단순증대혹감소선전주기균회약화전절강화적효과。재동양조작삼수하,왕복선전방식비사단과려급단향선전방식적막과려경리우연완막통량쇠감。
A novel dynamic filtration system of reciprocating rotating hollow fiber membrane was used to UF skim milk solution.The effects of the module＇s geometry parameters and rotating parameters as well as the characteristics of tested fluid on the decline of membrane permeate flux were investigated.The results indicated that a better shear enhancing efficiency could be obtained while the angular velocity and/or the radial distance of membranes from the central hollow shaft were increased.The greater vectors superposition of the flow field and the membrane rotating velocity,which was reflected on a relative greater velocity gradient,would be obtained once the reciprocating rotation cycle was optimized.Otherwise,simply increasing or decreasing the rotation cycle would weaken the efficiency of shear enhancement.With the same operating parameters,the reciprocating rotation filtration was more favorable in slowing the decline of membrane permeate flux than the dead end filtration or the uni-directional rotation filtration.