Cross-flow membrane ultrafiltration of the polysaccharide sodium alginate in aqueous solution was investigated in polymeric Helix membranes by in-situ magnetic resonance imaging (MRI) non-invasively and non-destructively. MRI allows velocity and NMR intensity measurements during filtration. In the present case and under the conditions used in the experiments, signal intensity is mainly generated by ¹H of water. Lower intensities can therefore be understood as a measure for material accumulation. Compressed sensing allows faster data acquisition, enabling a reliable, time resolved measurement of the ultrafiltration progress. Even under cross-flow filtration conditions, the membrane filtration is impaired by the increasing filtration resistance due to gel layer formation during the filtration of aqueous sodium alginate with CaCl₂. The Helix membrane has an additional helical ridge along the membrane wall to provide fouling inhibition, resulting in a complex three-dimensional flow field that was measured via compressed sensing MRI. Furthermore, the behavior of the deposit was classified more precisely by backwashing in the Helix membrane. Summarizing, the flow field, the deposit formation during cross-flow filtration in a Helix membrane and its backwashing was monitored and investigated by fast MRI methods.

通过非侵入性和非破坏性的原位磁共振成像（MRI）研究了聚合物螺旋膜中藻藻酸钠水溶液的错流膜超滤。MRI允许在过滤过程中测量速度和NMR强度。在目前情况下以及在实验中使用的条件下，信号强度主要由¹产生H的水。因此，较低的强度可以理解为材料累积的量度。压缩传感可以更快地获取数据，从而可以对超滤过程进行可靠，时间分辨的测量。即使在错流过滤条件下，由于在用CaCl ₂过滤藻酸钠水溶液的过程中形成凝胶层，因此过滤阻力的增加也损害了膜的过滤。。螺旋膜沿膜壁有一个附加的螺旋状脊，可提供结垢抑制作用，从而产生复杂的三维流场，该流场通过压缩传感MRI测量。此外，通过在Helix膜中进行反冲洗，可以更精确地对沉积物的行为进行分类。总之，通过快速MRI方法对流场，螺旋膜中错流过滤过程中的沉积物形成及其反冲洗进行了监测和研究。