| Ultrafiltration technology gradually becomes widespread in water treatmentapplications. However, its development was limited by the resulting membrane foulingproblem.This study demonstrates the ultrafiltration membrane pollution characteristicsof three membrane materials (PVDF, PES and EVOH) by different pollutants in order todetermine the advantages of various membrane materials pollutants. In addition, thisstudy also examines the PVDF ultrafiltration membrane fouling mechanism by humicacid (HA), sodium alginate (SA) and bovine serum albumin (BSA) with different ionicconditions due to the prevalence of Na+, Ca2+ions in natural waters and affect on thebehavior of ultrafiltration organic pollutants..Prepared by phase inversion consistentperformance PVDF, PES and EVOH flat ultrafiltration membrane. Optional citysecondary effluent organic pollutants (EfOM), humic acid (HA), sodium alginate (SA)and bovine serum albumin (BSA) for ultrafiltration membrane fouling tests. Afterfiltration the filtrate was measured by a contaminant DOC value to determine aparticular membrane retention of organic matter, using an atomic force microscopecombined with a film made of materials and contaminants probe PVDF quantitativedetermination of contaminants and pollutants under different ionicconditions–interactions between pollutants,while for the corresponding membranefouling removal and quantitative research experiment simulated pollutants. The resultsare as follows:（1）PES on the retention capacity of the strongest SA and BSA, PVDF for HA hasbetter retention. EVOH membrane for SA retention capacity than HA and BSA. The film after contamination by water washing in order to determine and measure the flux ofthe flux recovery, concluded that: three four pollutants flux membrane material forrecovery of almost similar, the film may be due to cleaning rate and pollutantinteractions between closely related with the film-interaction between pollutants andno direct relationship.（2）Interaction with the membrane fouling rate and the size of the magnitude ofPVDF-contamination between the molecules of pollutants and contaminants positivecorrelation. PVDF ultrafiltration membrane to remove the effect of alginate better.PVDF ultrafiltration membranes for humic acid DOC removal with pH value increases.DOC removal of bovine serum albumin law consistent with humic acid.（3）Alginate solution with Na+concentration will rise, on PVDF ultrafiltrationmembrane fouling increasingly serious. This trend and its adhesion strength isconsistent. When the presence of high concentrations of Na+ions more easily reach theremoval of organic carbon. Na+ions on humic acid affect the membrane foulingbehavior and interaction between PVDF-HA and HA-HA is not obvious. Bovine serumalbumin as a monovalent ion concentration increases, the DOC removal efficiencydecreases. Bovine serum albumin solution Na+ion concentration was0mM and1mM,its flux attenuation significantly more serious, and with concentration, its fluxattenuation to get slowed down.（4）Adhesion between the laws of sodium alginate and humic acid are as Ca2+concentration increases. Under different Ca2+ion concentration of sodium alginate canPVDF ultrafiltration membrane has a high remo val rate. With increasing concentrationof Ca2+ions, sodium alginate pollution ultrafiltration membrane flux declinedgradually worse. There is a similar pattern for the adhesion of Ca2+to bovine serumalbumin molecules. And under different Ca2+ion concentration PVDF ultrafiltrationmembrane of bovine serum albumin solution DOC removal were lower. |
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