Characterization of membrane foulants in a full-scale membrane bioreactor for supermarket wastewater treatment

Evaluation and prediction of membrane fouling in a submerged membrane bioreactor with simultaneous upward and downward aeration using artificial neural network-genetic algorithm

“…Membrane fouling, which results in the increase of trans-membrane pressure (TMP) or the decline of membrane flux dependent on the employed operational modes, is one of the major drawbacks for wider applications of SMBRs (Delgrange et al, 1998b;Guglielmi et al, 2007;Zhu et al, 2011). During the operation of SMBRs, colloidal particles and macromolecules tend to deposit in the pore of the membrane and on the membrane surface (Park et al, 2008;Park et al, 2010).…”

“…During the operation of SMBRs, colloidal particles and macromolecules tend to deposit in the pore of the membrane and on the membrane surface (Park et al, 2008;Park et al, 2010). Hence, it is of great significance to understand membrane foulants properties and membrane fouling mechanisms (Delgrange et al, 1998a;Shetty and Chellam, 2003;Zhu et al, 2011). Previous studies had been focused on the membrane foulants in an SMBR for synthetic A c c e p t e d M a n u s c r i p t 6 wastewater treatment using particle size analyzer (PSA), scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), X-ray fluorescence (XRF), energy diffusive X-ray analyzer (EDX), and Fourier transform infrared (FT-IR) spectroscopy (Cho and Fane, 2002;Chon et al, 2013).…”

“…Previous studies had been focused on the membrane foulants in an SMBR for synthetic A c c e p t e d M a n u s c r i p t 6 wastewater treatment using particle size analyzer (PSA), scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), X-ray fluorescence (XRF), energy diffusive X-ray analyzer (EDX), and Fourier transform infrared (FT-IR) spectroscopy (Cho and Fane, 2002;Chon et al, 2013). They approved that the small particles in sludge suspension, bacterial clusters, polysaccharides, proteins and inorganic compounds played a significant role in membrane fouling (Meng et al, 2007;Zhu et al, 2011).…”

Fluorescence approach for investigating binding properties between metals and soluble microbial products from a biological wastewater treatment plant

“…However, the compositions of SMP is too complex, traditional fluorescence technique is not appropriate to determine the binding properties of SMP, because quenching of fluorescence properties at a single wavelength would not account for different types of fluorophores coexisting in SMP. Three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy, which collects the whole profiles of fluorescence intensity responses along both excitation and emission wavelengths, can entirely give the fluorescence characteristics of SMP [10][11][12]. Different regions of EEM spectra were found to be quenched (or enhanced) to a different degree by metals, indicating various degrees of interaction between different fluorophores and metals [13].…”

Membrane fouling in industrial anaerobic membrane bioreactors

“…Irreversible (removed by chemical cleaning) and irrecoverable fouling is generally caused by pore plugging and surface adsorption [56]. Literature on membrane filtration of fatty wastewaters such as, snacks factory wastewater [4], supermarket wastewater [57], household appliance factory wastewater containing emulsified mineral oil [58] and bilge water [59], found that the primary mechanism of lipid (including fats, oils and grease or FOG) fouling is adsorption of oil droplets within membrane pores which can lead to irreversible and irrecoverable membrane fouling. Therefore, lipid pore fouling and associated irreversible and irrecoverable membrane fouling will have a long term impact on fouling rates; which are not seen in the short term fouling rate measurements in this chapter.…”