A novel membrane bioreactor based on membrane distillation

Phattaranawik, Jirachote; Fane, Anthony G.; Pasquier, Audrey C. S.; Wu, Bing

doi:10.1016/j.desal.2007.02.075

Cited by 134 publications

(81 citation statements)

References 12 publications

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“…The concept is also amenable to other membrane separations, such as membrane distillation (MD) and forward osmosis (FO). Indeed 'high-retention' MBRs based on MD and FO with submerged HFs have been developed [333,334]. Further work is required to optimize these systems, including development of externally skinned FO hollow fiber membranes to minimize fouling.…”

Section: Potential Non-filtration Applicationsmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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Abstract:The submerged membrane filtration concept is well-established for low-pressure microfiltration (MF) and ultrafiltration (UF) applications in the water industry, and has become a mainstream technology for surface-water treatment, pretreatment prior to reverse osmosis (RO), and membrane bioreactors (MBRs). Compared to submerged flat sheet (FS) membranes, submerged hollow fiber (HF) membranes are more common due to their advantages of higher packing density, the ability to induce movement by mechanisms such as bubbling, and the feasibility of backwashing. In view of the importance of submerged HF processes, this review aims to provide a comprehensive landscape of the current state-of-the-art systems, to serve as a guide for further improvements in submerged HF membranes and their applications. The topics covered include recent developments in submerged hollow fiber membrane systems, the challenges and developments in fouling-control methods, and treatment protocols for membrane permeability recovery. The highlighted research opportunities include optimizing the various means to manipulate the hydrodynamics for fouling mitigation, developing online monitoring devices, and extending the submerged HF concept beyond filtration.

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Section: Potential Non-filtration Applicationsmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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“…To date the use of bubbling with MD has been limited to the studies on the MD bioreactor [13]. To our knowledge, no prior work on MD for high concentration applications has systematically studied gas bubbling to mitigate concentration and/or temperature polarization effects and control crystal deposition and scaling formation.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement and scaling control with gas bubbling in direct contact membrane distillation

et al. 2013

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This study incorporates gas bubbling into direct contact membrane distillation (DCMD) and examines its effect on the MD performance especially at elevated salt concentrations in the feed steam. Process optimization in the bubbling assisted DCMD process was carried out which involved varying operating conditions and module configurations. Also, observations were performed for the scaling status on the membrane surface with operating time in different modules to further understand the role of gas bubbling in affecting the behavior of crystal deposition when the salt concentration has reached super-saturation.Due to intensified local mixing and physical flow disturbance in the liquid boundary layer on the feed side, a higher flux enhancement could be achieved in a bubbling system with either a higher feed operating temperature, lower feed and permeate flow velocities, inclined module orientation, shorter fiber length or lower packing density. It was also found that gas bubbling not only enhanced the permeation flux by average 26% when concentrating feed solution from 18% salt concentration to saturation, but also delayed the occurrence of major flux decline due to crystal deposition when compared to the module with spacers. These results were confirmed by membrane surface autopsy at different operating stages SEM.

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“…MD has potential applications in many areas of scientific and industrial interest, yielding highly purified permeate and separating contaminants from liquid solutions. It has been tested for the treatment of thermally sensitive industrial products such as concentrating aqueous solution in fruit juices, the biotechnology industry, as well as for wastewater treatment and water desalination [5,[10][11][12][13][14][15][16][17][18]. Since the process of membrane distillation is independent of the solution osmotic pressure (or salinity), MD is particularly ideal for the treatment of saline solution such as RO concentrate from inland water recycling or brackish water desalination applications [4,5,19].…”

Section: Introductionmentioning

confidence: 99%

Treatment of saline aqueous solutions using direct contact membrane distillation

Nghiem

Hildinger

Hai

et al. 2011

Desalination and Water Treatment

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ab s t r ac tThe treatment of highly saline aqueous solutions using direct contact membrane distillation (DCMD) was evaluated in this study. Experiments were conducted using a flat sheet polytetrafluoroethylene membrane with nominal pore size of 0.22 µm. Seawater, reverse osmosis (RO) concentrate collected from a wastewater reclamation plant, and a synthetic solution containing 2,000 mg/L of CaSO 4 were selected as the representative saline solutions. A gradual decline in permeate flux was observed at the beginning of the experiments when the seawater and RO concentrate solutions were treated using the DCMD process, most likely due to initial organic fouling and scaling. In contrast, when the saturated CaSO 4 solution was used as the feed, the permeate flux was stable for approximately 300 min of operation. However, when these solutions were concentrated beyond their solubility limit, crystallization of the sparingly soluble salts occurred on the membrane surface, leading to a complete loss of permeate flux at the end of the experiment. Contact angle measurement of the fouled and scaled membranes revealed a significant reduction in hydrophobicity. Membrane fouling and scaling were also confirmed by scanning electron microscopy analysis. The results suggest that pretreatment to remove organic matter is essential to prevent organic fouling. In addition, a major limiting factor for the treatment of saline solutions using DCMD appears to be the solubility of sparingly soluble salts.

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A novel membrane bioreactor based on membrane distillation

Cited by 134 publications

References 12 publications

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

Performance enhancement and scaling control with gas bubbling in direct contact membrane distillation

Treatment of saline aqueous solutions using direct contact membrane distillation

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