A Thermodynamical Approach for Evaluating Energy Consumption of the Forward Osmosis Process Using Various Draw Solutes

Conventional zero-liquid discharge (ZLD) processes alleviate environmental concerns associated with brine discharge, but are not widely applied, due to their high cost and significant energy consumption. How-40 required membrane stages is almost halved from 6 to 4. 120 (FO) (Shaffer et al. 2015) can be utilised to further dewater the RO concentrate and are thus promising BVM technologies. Electrodialysis and capacitive deionization can also be utilised in BVM processes (Tsai et al. 2017), although they are mainly applied for low salin-125

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“…Therefore, a high N/C ratio of 2.4 is chosen for the numerical simulations. This N/C ratio was also chosen by Zeng et al (2017).…”

Section: The Draw Solutionmentioning

confidence: 99%

The synergy between osmotically assisted reverse osmosis (OARO) and the use of thermo-responsive draw solutions for energy efficient, zero-liquid discharge desalination

Peters

Hankins

2020

Desalination

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“…Among inorganic salts, sodium chloride is regarded as the most widely used draw solute because of its high solubility, high osmotic pressure, low price, wide source, and negligible toxicity [59].…”

Section: Inorganic Saltsmentioning

confidence: 99%

Research on Forward Osmosis Membrane Technology Still Needs Improvement in Water Recovery and Wastewater Treatment

Shi

2019

Water

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Forward osmosis (FO) has become an evolving membrane separation technology to recover water due to its strong retention capacity, sustainable membrane fouling, etc. Although a good deal of research has been extensively investigated in the past decades, major challenges still remain as follows: (1) the novel FO membrane material properties, which significantly influence the fouling of the FO membranes, the intolerance reverse solute flux (RSF), the high concentration polarization (CP), and the low permeate flux; (2) novel draw solution preparation and utilization; (3) salinity build-up in the FO system; (4) the successful implementation of the FO process. This work critically reviews the last five years’ literature in development of the novel FO membrane material, structure in modification, and preparation, including comparison and analysis on the traditional and novel draw solutes coupled with their effects on FO performance; application in wastewater treatment, especially hybrid system and integrated FO system; fouling mechanism; and cleaning strategy as discussed in the literature. The current barriers of the research results in each hotspot and the areas that can be improved are also analyzed in detail. The research hotspots in the research and development of the novel membrane materials in various countries and regions have been compared in recent years, and the work of variation in pop research hotspots in the past 10 years has been analyzed and the ideas that fill the blank gaps also have been proposed.

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“…When the membrane process is osmotically driven, take FO for example, which is proposed in the preceding paper [24]. There is no applied pressure, and a high concentration of draw solution is used to obtain water from the feed solution.…”

Section: Fo Unit Modelmentioning

confidence: 99%

“…In the preceding paper [24], a thermodynamical approach for evaluating energy consumption of the FO process has been proposed. Zeng compared FO process performance using different draw solutes.…”

Section: Introductionmentioning

confidence: 99%

A Thermodynamical Approach for Evaluating Energy Consumption of the Nanofiltration-Crystallization Process on Selective Separation of Chloride and Sulfate

Zeng

Wang

2018

Water

Self Cite

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Nanofiltration (NF) coupling processes have been applied to treat high salinity wastewater in many studies. The main reason that affects the industrialization of the wastewater treatment is the high cost, which is mainly caused by the energy consumption of the entire system. Therefore, how to evaluate the energy consumption of different process configurations is an important issue. In this work, a thermodynamical approach was explained in detail, which could be used for evaluating energy consumption for pressure-driven membrane processes (e.g., NF and reverse osmosis) and osmotically driven membrane processes (e.g., forward osmosis). The coupling process configurations of NF, reverse osmosis (RO) and crystallization (Cryst) were selected to evaluate the energy consumption for high NaCl and Na 2 SO 4 concentration wastewater in this paper. Four different process configurations (NF-Cryst, RO-Cryst, RO-NF-Cryst, NF-RO-Cryst) were simulated using Aspen Plus. The processes were discussed using a thermodynamical approach with a customized NF model. The electrolyte Non-Random Two-Liquid (electrolyte-NRTL) model was employed to calculate the thermodynamic properties of the solutions. The simulation results showed that the energy consumption per cubic meter of treated water (E water ) in NF-Cryst and NF-RO-Cryst processes were lower than that of RO-Cryst and RO-NF-Cryst. When c f ,Na 2 SO 4 was low (e.g., 15 g•L −1 ), there was not much difference in energy consumption between NF-Cryst and NF-RO-Cryst processes. Moreover, the high efficiency of NF was revealed in the separation of salt and decrease in the energy consumption of the whole process.

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A Thermodynamical Approach for Evaluating Energy Consumption of the Forward Osmosis Process Using Various Draw Solutes

Cited by 8 publications

References 30 publications

The synergy between osmotically assisted reverse osmosis (OARO) and the use of thermo-responsive draw solutions for energy efficient, zero-liquid discharge desalination

The synergy between osmotically assisted reverse osmosis (OARO) and the use of thermo-responsive draw solutions for energy efficient, zero-liquid discharge desalination

Research on Forward Osmosis Membrane Technology Still Needs Improvement in Water Recovery and Wastewater Treatment

A Thermodynamical Approach for Evaluating Energy Consumption of the Nanofiltration-Crystallization Process on Selective Separation of Chloride and Sulfate

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