Streaming potential and SEM-EDX study of UF membranes fouled by colloidal iron

Yaniv Soffer, Jack Gilron, Avner Adin

    Research output: Contribution to journalArticlepeer-review

    27 Scopus citations

    Abstract

    Destabilization-flocculation is often used as a pretreatment before ultrafiltration of drinking water and secondary wastewater effluent. The fouling of ultrafiltration membranes by colloidal iron hydroxide-oxide has been studied by measuring the pore streaming potential of a series polysulfone type UF membranes with 10 KDa-50 KDa NMWCO. SEM-EDX was carried out on the fouled membranes and the iron distribution in and on the fouled membrane was determined. Fouling of the membranes as measured by flux reduction was usually accompanied by a positive change in zeta potential and iso-electric point (IEP) of the membrane. Severity of fouling seems to correlate with the presence of some pores of size larger than part of the iron colloid particle size distribution. SEM-EDX confirmed presence of iron within those membranes (20 KDa) suffering the most fouling. An initially large change in zeta potential was seen even after relatively small amounts of solution were filtered through the membrane. A control experiment showed this is not due to iron adsorption equilibrium, but should probably be attributed to fouling.

    Original languageEnglish
    Pages (from-to)115-121
    Number of pages7
    JournalDesalination
    Volume146
    Issue number1-3
    DOIs
    StatePublished - 10 Sep 2002

    Keywords

    • Fouling
    • Iron coagulation
    • Pretreatment
    • Streaming potential
    • Ultrafiltration
    • Zeta potential

    Fingerprint

    Dive into the research topics of 'Streaming potential and SEM-EDX study of UF membranes fouled by colloidal iron'. Together they form a unique fingerprint.

    Cite this