Effects of cationic polyelectrolyte on filterability and fouling reduction of submerged membrane bioreactor (MBR)

Nadir Dizge, Derya Yuksel Koseoglu-Imer, Ahmet Karagunduz*, Bulent Keskinler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Organic and inorganic polyelectrolytes are commonly used as coagulants or flocculants in membrane bioreactor to enhance the filtration properties of membranes. The main objective of this study was to determine the effectiveness of organic cationic polyelectrolyte (CPE) addition on filterability of various membranes and to investigate the influences on fouling of membranes. First, batch tests were performed to determine the optimum polyelectrolyte concentration at which the highest soluble microbial products (SMPs) removal was observed. Then, short-term filtration test were conducted. Cellulose acetate, polyethersulfone, mixed ester, polycarbonate (CA, PES, ME, PC) membranes with two different pore sizes (0.45-0.40 and 0.22-0.20 μm) were used in submerged MBR experiments. Permeate flux decline at constant vacuum was observed with time. Protein and carbohydrate analysis were performed in the permeate samples. Filtration resistances were determined for each membrane. Cake resistance was observed to be the most significant fouling mechanism for all membranes. Polyelectrolyte addition decreased the cake resistance. The effect of polyelectrolyte on pore resistance was relatively insignificant. The results showed that addition of polyelectrolyte had significant impact on sustainable filtration time.

Original languageEnglish
Pages (from-to)175-181
Number of pages7
JournalJournal of Membrane Science
Issue number1-2
Publication statusPublished - 15 Jul 2011
Externally publishedYes


This study was financially supported by the TUBITAK , the Scientific and Technological Research Council of Turkey (Project No: 108Y129 ).

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu108Y129


    • Activated sludge
    • Extracellular polymeric substances (EPSs)
    • Flux enhancing chemical
    • Membrane fouling
    • Microfiltration
    • Soluble microbial products (SMPs)
    • Submerged membrane bioreactor


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