| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 640323 | Separation and Purification Technology | 2015 | 8 Pages |
•A new high-intensity magnetic hydrogels was synthesized for membrane physical cleaning.•An optimal combination of factors and levels was got for the hydrogels cleaning.•A new method containing enhanced cleaning in position was created for intensive cleaning.
A newly synthesized magnetic hydrogel was applied to physical cleaning of low pressure microfiltration (hollow fiber) membranes. MC(50%)-90-3 h was chosen from several kinds of high-intensity magnetic hydrogels for its superior performance. According to the properties of the hydrogels, membrane filtration and cleaning tests was conducted under a orthogonal experiment with different factors and levels. An optimal combination of factors and levels was got as particle size of 5 mm, aeration intensity of 1 L/min and volume percent of 10%. The comparison of traditional aeration cleaning, backwashing and the hydrogels cleaning showed the superiority of the hydrogels with the TMP recovery of 93.07%. The results of shear stress detection showed that the outlet of membrane module received the lowest shear stress in corresponding with the most serious fouling. Therefore, a new cleaning method containing enhanced cleaning in position was created to make the intensive cleaning to the position with severe fouling. The recovery of TMP reached up to 96.62% after cleaning of the new method which indicated that reversible fouling can almost be removed completely. This good cleaning effect was hoped to provide support for further membrane physical cleaning.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
