Polyferric Silicate Sulfate Prepared in Different Methods for Organic Polluant Removal in Membrane Fouling Control
Laboratory experiments were conducted,in which the simulative organic pollutants of membrane included humic acid,aniline,sodium alginate and hydroxypropyl methyl fiber,representing the natural organic matter in water including hydrophobic acid,hydrophobic alkaline,hydrophilic charged and hydrophilic neutral substances that cause membrane fouling;meanwhile,polyferric silicate sulfate(PFSS)was prepared in different ways,which included methods such as polysilicate+Fe3+,polysilicate+polyferric sulfate(PFS),and polysilicte+Fe2++H2O2.PFSS worked well as a sort of flocculant to purify the water containing the natural organic matter by flocculation/sedimentation,with the supernatant to be filtered by MF membrane.The experimental study focused on the effects of the differently prepared PFSS on removal of organic matter and membrane fouling.Findings of the study suggested that aniline and sodium alginate,among others,were the most difficult to remove,while humic acid was easy to get rid of,and compared with the PFSS prepared by polysilicate +Fe3 +,the PFSS prepared by polysilicate+polyferric sulfate(PFS),and polysilicte+Fe2++H2O2 were more likely able to remove the polltants which would cause irreversible membrane fouling such as aniline,sodium alginate and hydroxypropyl methyl fiber,thus showing better membrane cleaning performance.