A unified thermodynamic mechanism underlying fouling behaviors of soluble microbial products (SMPs) in a membrane bioreactor

Teng, Jiaheng; Zhang, Meijia; Leung, Ka Yin; Chen, Jianrong; Hong, Huachang; Lin, Hongjun; Liao, B. Q.

doi:10.1016/j.watres.2018.11.043

Cited by 216 publications

(36 citation statements)

References 66 publications

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“…Solutes that cannot pass through the pores accumulate and form a mass transfer boundary layer at the membrane surface. The osmotic pressure difference between the filtrate and feed solution reduces the effective transmembrane pressure (TMP) and causes the flux to decline [15]. Furthermore, solute molecules accumulating at the membrane surface also reduce the solvent activity and thus the flow through the membrane [16].…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of an Enzyme Membrane Reactor for Fructo-Oligosaccharide Production

et al. 2019

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Fructo-oligosaccharides (FOS) are linear fructans comprising 2–5 fructose units linked to a terminal glucose residue. They are widely used as food and feed additives due to their sweetness, low calorific value, and prebiotic properties. Here we describe the synthesis of FOS catalyzed by a cell-free crude enzyme solution containing recombinant fructosyltransferase (1-FFT) produced in the yeast Kluyveromyces lactis. During the enzyme catalysis, glucose accumulates as a by-product and eventually inhibits FOS production. We therefore used an enzyme membrane reactor (EMR) to achieve the continuous removal of glucose and the simultaneous replenishment of sucrose. We observed a loss of flux during the reaction with the characteristics of complete pore blocking, probably caused by a combination of proteins (enzyme molecules) and polysaccharides (FOS). Such complex fouling mechanisms must be overcome to achieve the efficient production of FOS using EMR systems.

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Section: Introductionmentioning

confidence: 99%

Development and Characterization of an Enzyme Membrane Reactor for Fructo-Oligosaccharide Production

et al. 2019

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“…Membrane fouling also significantly influenced OMPs rejection, and a previous study observed that the initial FO water flux played a key role in both membrane fouling and OMPs rejection (Jin et al, 2012;Xie et al, 2014a). Interfacial interactions between foulants and membrane are decisive forces to membrane fouling (Qu et al, 2018;Teng et al, 2019), potentially affecting the OMPs rejection. The surface characteristics of the fouling layer in a fouled FO membrane could also influence OMPs rejection (Valladares Linares et al, 2011).…”

Section: Introductionmentioning

confidence: 94%

Understanding the organic micropollutants transport mechanisms in the fertilizer-drawn forward osmosis process

Kim

Phuntsho

et al. 2019

Journal of Environmental Management

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We systematically investigated the transport mechanisms of organic micropollutants (OMPs) in a fertilizer-drawn forward osmosis (FDFO) membrane process. Four representative OMPs, i.e., atenolol, atrazine, primidone, and caffeine, were chosen for their different molecular weights and structural characteristics. All the FDFO experiments were conducted with the membrane active layer on the feed solution (FS) side using three different fertilizer draw solutions (DS): potassium chloride (KCl), monoammonium phosphate (MAP), and diammonium phosphate (DAP) due to their different properties (i.e., osmotic pressure, diffusivity, viscosity and solution pH). Using KCl as the DS resulted in both the highest water flux and the highest reverse solute flux (RSF), while MAP and DAP resulted in similar water fluxes with varying RSF. The pH of the FS increased with DAP as the DS due to the reverse diffusion of NH4 + ions from the DS toward the FS, while for MAP and DAP DS, the pH of the FS was not impacted. The OMPs transport behavior (OMPs flux) was evaluated and compared with a simulated OMPs flux obtained via the pore-hindrance transport model to identify the effects of the OMPs structural properties. When MAP was used as DS, the OMPs flux was dominantly influenced by the physicochemical properties (i.e., hydrophobicity and surface charge). Those OMPs with positive charge and more hydrophobic, exhibited higher forward OMP fluxes. With DAP as the DS, the more hydrated FO membrane (caused by increased pH) as well as the enhanced RSF hindered OMPs transport through the FO membrane. With KCl as DS, the structural properties of the OMPs were dominant factors in the OMPs flux, however the higher RSF of the KCl draw solute may likely hamper the OMPs transport through the membrane especially those with higher MW (e.g., atenolol). The pore-hindrance model can be instrumental in understanding the effects of the hydrodynamic properties and the surface properties on the OMPs transport behaviors.

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“…The fouling mechanism, however, is generally not well understood. Teng et al (2019) undertook a study of SMP fouling behavior during initial operational period of a MBR and developed a thermodynamic mechanism explaining how SMPs preferentially adhered to the membrane surface.…”

Section: Quorum Quenchingmentioning

confidence: 99%

Membrane processes

Arabi¹,

Pellegrin

Aguinaldo

et al. 2020

Water Environment Research

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This literature review provides a review for publications in 2018 and 2019 and includes information membrane processes findings for municipal and industrial applications. This review is a subsection of the annual Water Environment Federation literature review for Treatment Systems section. The following topics are covered in this literature review: industrial wastewater and membrane. Bioreactor (MBR) configuration, membrane fouling, design, reuse, nutrient removal, operation, anaerobic membrane systems, microconstituents removal, membrane technology advances, and modeling. Other subsections of the Treatment Systems section that might relate to this literature review include the following: Biological Fixed-Film Systems, Activated Sludge, and Other Aerobic Suspended Culture Processes, Anaerobic Processes, and Water Reclamation and Reuse. This publication might also have related information on membrane processes: Industrial Wastes, Hazardous Wastes, and Fate and Effects of Pollutants.

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A unified thermodynamic mechanism underlying fouling behaviors of soluble microbial products (SMPs) in a membrane bioreactor

Cited by 216 publications

References 66 publications

Development and Characterization of an Enzyme Membrane Reactor for Fructo-Oligosaccharide Production

Development and Characterization of an Enzyme Membrane Reactor for Fructo-Oligosaccharide Production

Understanding the organic micropollutants transport mechanisms in the fertilizer-drawn forward osmosis process

Membrane processes

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