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a Magneto-mechanical drawing solution forms droplet at the pinpoint.
In a typical procedure, magneto-mechanical drawing solution is pushed out of the needle by the syringe pump, forming droplet at the pinpoint because of the surface tension (Fig. 1a).
In order to prepare the magneto-mechanical drawing solution with PVDF concentration of 22 wt.%, 2.2 g PVDF was dissolved into 7.8 g mixed solution of DMF and acetone (50/50, w/w) with magnetic stirring at 40 °C for 2.5 h to form the precursor solution.
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Water flux with the TMA CO2 draw solution was comparable to that obtained with the more common ammonia carbon dioxide (NH3 CO2) thermolytic draw solution at similar (1 M) concentration.
Implications for the design of porous FO membranes and draw solution are discussed.
Finally, a simple heuristic for selecting the flow ratio based on the entering concentrations of the feed solution and draw solution and the desired recovery rate is identified.
The model simulates salt accumulation, draw solution dilution and water flux in OMBR with sludge concentrator for high retention and low salt concentration factor.
The TFC-FO membrane comprising 50 wt% SPEK in the substrate shows the highest water flux of 50 LMH against deionized water and 22 LMH against the 3.5 wt% NaCl model solution, respectively, when using 2 M NaCl as the draw solution tested under the pressure retarded osmosis (PRO) mode (draw solution flows against the selective layer).
On the other hand, Eq. (5) establishes the lower bound on solutions that LDALR recommends i.e., on the average, LDALR's solution can not be worse than a randomly drawn solution.
The modulus and strength of the drawn sprayed PVA films are about half of those of the drawn solution-cast PVA films.
In addition, water recovery data as a function of feed flow rate fraction were compared with model results based on the equilibrium between the feed and draw solutions.
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