The application of polyethyleneimine draw solution in a combined forward osmosis/nanofiltration system

Jun, Byung-Moon; Nguyen, Thi Phuong Nga; Ahn, Soohyun; Kim, In‐Chul; Kwon, Young‐Nam

doi:10.1002/app.42198

Cited by 40 publications

(20 citation statements)

References 43 publications

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“…The water fluxes in the FO and LPM filtration test were calculated using the following equation: where, J w is the water flux of the membrane (L m −2 h −1 , LMH), ∆V is the change in permeate volume, A represents the area of the membrane (m 2 ), and t is the operating time 7 , 14 , 24 , 25 .…”

Section: Methodsmentioning

confidence: 99%

New concept of pump-less forward osmosis (FO) and low-pressure membrane (LPM) process

Choi

Jeong

et al. 2017

Sci Rep

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We tested the possibility of energy-saving water treatment methods by using a pump-less forward osmosis (FO) and low-pressure membrane (LPM) hybrid process (FO-LPM). In this pump-less FO-LPM, permeate migrates from the feed solution (FS) to the draw solution (DS) through the FO membrane by use of osmotic pressure differences. At the same time, within the closed DS tank, inner pressure increases as the DS volume increases. By using the DS tank’s internal pressure, the LPM process works to re-concentrate the diluted DS, maintaining the DS concentration and producing clean water. In this study, a polymer - polystyrene sulfonate (PSS) was used as a draw solute. Based on the results of each individual portion of the process, the optimal range of the PSS DS was determined. The performance of the pump-less FO-LPM process was lower than that of a single process; however, we observed that the hybrid process can be operated without a pump for regeneration of a diluted DS. This research highlights the feasibility and applicability of pump-less FO-LPM processes using a polymeric DS for water treatment. Additionally, it is suggested that this novel process offers a breakthrough in FO technology that is often limited by operation and management cost.

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Section: Methodsmentioning

confidence: 99%

New concept of pump-less forward osmosis (FO) and low-pressure membrane (LPM) process

Choi

Jeong

et al. 2017

Sci Rep

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“…We chose draw molecules that have been previously demonstrated in forward osmosis systems: a salt (NaCl) [15], a sugar (sucrose) [17], and a polyelectrolyte (polyethylenimine) [16]. If a membrane fails to reject Na + and Cl - (23 Da, 35 Da), then larger sucrose (342 Da) or very large polyelectrolytes like polyethylenimine (600 Da to 60 kDa) may be required by membranes with larger pores.…”

Section: Methodsmentioning

confidence: 99%

Continuous, quantifiable, and simple osmotic preconcentration and sensing within microfluidic devices

et al. 2019

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Insurmountable detection challenges will impede the development of many of the next-generation of lab-on-a-chip devices (e.g., point-of-care and real-time health monitors). Here we present the first membrane-based, microfluidic sample preconcentration method that is continuous, quantifiable, simple, and capable of working with any analyte. Forward osmosis rapidly concentrates analytes by removing water from a stream of sample fluid. 10-100X preconcentration is possible in mere minutes. This requires careful selection of the semi-permeable membrane and draw molecule; therefore, the osmosis performance of several classes of membranes and draw molecules were systematically optimized. Proof-of-concept preconcentration devices were characterized based on their concentration ability and fouling resistance. In-silico theoretical modeling predicts the experimental findings and provides an engineering toolkit for future designs. With this toolkit, inexpensive ready-for-manufacturing prototypes were also developed. These devices provide broad-spectrum detection improvements across many analytes and sensing modalities, enabling next-generation lab-on-a-chip devices.

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“…Combining Eqs. The physico-chemical properties of the DS are critical factors in osmotic driven membrane processes [18,35,36].…”

Section: Lpm Equationmentioning

confidence: 99%

Application of volume-retarded osmosis and low-pressure membrane hybrid process for water reclamation

Choi

Lee

et al. 2018

Chemosphere

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A new concept of volume-retarded osmosis and low-pressure membrane (VRO-LPM) hybrid process was developed and evaluated for the first time in this study. Commercially available forward osmosis (FO) and ultrafiltration (UF) membranes were employed in a VRO-LPM hybrid process to overcome energy limitations of draw solution (DS) regeneration and production of permeate in the FO process. To evaluate its feasibility as a water reclamation process, and to optimize the operational conditions, cross-flow FO and dead-end mode UF processes were individually evaluated. For the FO process, a DS concentration of 0.15 g mL of polysulfonate styrene (PSS) was determined to be optimal, having a high flux with a low reverse salt flux. The UF membrane with a molecular weight cut-off of 1 kDa was chosen for its high PSS rejection in the LPM process. As a single process, UF (LPM) exhibited a higher flux than FO, but this could be controlled by adjusting the effective membrane area of the FO and UF membranes in the VRO-LPM system. The VRO-LPM hybrid process only required a circulation pump for the FO process. This led to a decrease in the specific energy consumption of the VRO-LPM process for potable water production, that was similar to the single FO process. Therefore, the newly developed VRO-LPM hybrid process, with an appropriate DS selection, can be used as an energy efficient water production method, and can outperform conventional water reclamation processes.

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The application of polyethyleneimine draw solution in a combined forward osmosis/nanofiltration system

Cited by 40 publications

References 43 publications

New concept of pump-less forward osmosis (FO) and low-pressure membrane (LPM) process

New concept of pump-less forward osmosis (FO) and low-pressure membrane (LPM) process

Continuous, quantifiable, and simple osmotic preconcentration and sensing within microfluidic devices

Application of volume-retarded osmosis and low-pressure membrane hybrid process for water reclamation

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