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    Investigation of membrane fouling in an anaerobic membrane bioreactor (AnMBR) treating pharmaceutical wastewater

    Year: 2019

    Journal: J. Water Process. Eng., Volume 31, OCT

    Authors: Kaya, Yasemin; Bacaksiz, Ahmet Murat; Bayrak, Hasan; Vergili, Ilda; Gonder, Zeren Beril; Hasar, Halil; Yilmaz, Gulsum

    Organizations: Scientific and Technical Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [CAYDAG-111Y078]; Research Fund of the Istanbul UniversityIstanbul University [32206, 49120]

    Keywords: Anaerobic membrane bioreactor; Flat-sheet membrane; Hollow-fiber membrane; Membrane autopsy; Flux modelling

    This study is focused on the fouling of flat-sheet and hollow-fiber membranes in a lab-scale anaerobic membrane bioreactor (AnMBR). A comprehensive investigation including scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), fourier transform infrared (FT-IR) spectroscopy, confocal laser scanning microscopy (CLSM), zeta potential, optical profilometer and contact angle, and flux modelling was presented in this study. The effect of extracellular polymeric substances (EPS) accumulated on cake-layer were also considered. The cake-layer on the flat-sheet membrane formed much more than that on the hollow-fiber membrane. The thickness of cake-layer on the flat-sheet membrane was effectively decreased by physical stripping. However, proteins indicating structures of Amide I and Amide II, and carbohydrates were observed on the stripped hollow-fiber membrane. According to the flux modelling results, the cake-layer formation and intermediate-adsorption were found as effective mechanisms on both membranes. Especially, these mechanisms were more effective for the hollow-fiber membrane due to irreversible fouling.
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