Polymer-assisted ultrafiltration

Polymer-Assisted Ultrafiltration of Boric Acid. The Quickstand (AGT, Needham, MA) filtration apparatus is pictured schematically in Figure 3. The hollow fiber membrane module contained approximately 30 fibers with 0.5 mm internal diameter and had a nominal molecular weight cut-off of 10,000 and a surface area of 0.015 m2. A pinch clamp in the retentate recycle line was used to supply back pressure to the system. In a typical run, the transmembrane pressure was maintained at 25 psig and the retentate and permeate flow rates were 25 ml/min and 3 ml/min, respectively. Permeate flux remained constant throughout the experiments. 

Polymer-assisted ultrafiltration. The functionalized dendrimer described above was used to remove boron from an aqueous feed stream. With the polymer in the holding cell (see Figure 3), the feed was added at the same rate that the permeate left the system. The differential equation describing the change in total boron concentration in the holding cell as a function of permeate volume is simply d(Bt)... 

Smith, B.M., P. Todd, and C.N. Bowman, Boron removal by polymer-assisted ultrafiltration. Separation Science and Technology, 1995. 30(20) p. 3849-3859. 

Smyth, B.M., Todd, P., and Bowman, N., H3fperbranched chelating polymers for the polymer-assisted ultrafiltration of boric acid, Sep. Sci. TechnoL, 34, 10, 1925, 1999. 

Cojocaru, C., Zakrzewska-Trznadel, G., Jaworska, A., Removal of cobalt ions from aqueous solutions by polymer assisted ultrafiltration using experimental design approach. Part 1 Optimization of complexation conditions, J. Hazard. Mater. 169, 599, 2009. 

Mohnari R, Poerio T and Argurio P (2007), Chemical and operational aspects in running the polymer assisted ultrafiltration for separation of copper(II)-citrate complexes from aqueous media, J Membrane Sci, 295,139-147. 

To utilize poly(acrylic acid) (represented as HL) as a chelating polymer in polymer-assisted ultrafiltration based removal of a divalent heavy metal (M", n = 2) present in wastewater, it is useful to consider the following polymer ligand-metal complexation equilibria ... 

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