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Author: search.filters.author.Pancharoen, UraSubject: search.filters.subject.Separation

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    High-efficiency HFSLM for silver-ion pertraction from pharmaceutical wastewater and mass-transport models
    (2014-11-01)
    Wongsawa, Thidarat
    ;
    Sunsandee, Niti
    ;
    Pancharoen, Ura
    ;
    Lothongkum, Anchaleeporn Waritswat
    Hollow fiber supported liquid membrane (HFSLM) is a favorable technique for the pertraction of metal ions, especially at very low metal concentration. In this work, the pertraction of silver ions from acidic pharmaceutical wastewater via HFSLM was investigated. Pharmaceutical wastewater containing 30mg/dm<sup>3</sup> of silver ions and 120mg/dm<sup>3</sup> of ferric ions was subjected to HFSLM as a feed solution. LIX 84-I dissolved in organic solvent together with Na<inf>2</inf>S<inf>2</inf>O<inf>3</inf>5H<inf>2</inf>O solution was selected for use as a liquid membrane and a receiving solution, respectively. The influence of ferric ions on the pertraction of silver ions was studied firstly using wastewater with normal ferric ion concentration and secondly using wastewater with ferric ion precipitation by phosphoric acid solution. The highest pertraction of silver ions was achieved by using 0.1M of LIX 84-I and 0.5M of Na<inf>2</inf>S<inf>2</inf>O<inf>3</inf>·5H<inf>2</inf>O solution at pH of feed and receiving solutions of 3.5 and 2. The flow rates of feed and receiving solutions were 0.2dm<sup>3</sup>/min. 0.6mg/dm<sup>3</sup> of silver ions that remained in the wastewater was below the mandatory discharge limit. No effect of normal ferric ion concentration in the wastewater on silver ion pertraction was observed. The crucial parameters were defined to confirm the efficiency and reliability of the system. Finally, the controlling transport regime of silver ion pertraction across HFSLM was determined by the diffusion flux and reaction flux models.
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    Separation of As(III) and As(V) by hollow fiber supported liquid membrane based on the mass transfer theory
    (2008-01-01)
    Prapasawat, Tatchanok
    ;
    Ramakul, Prakorn
    ;
    Satayaprasert, Chairit
    ;
    Pancharoen, Ura
    ;
    Lothongkum, Anchaleeporn W.
    Separation of As(III) and As(V) ions from sulphate media by hollow fiber supported liquid membrane has been examined. Cyanex 923 was diluted in toluene and used as an extractant. Water was used as a stripping solution. The extractability of As(V) was higher than As(III). When the concentration of sulphuric acid in feed solution and Cyanex 923 in liquid membrane increased, more arsenic ions were extracted into liquid membrane and recovered into the stripping solution. The mathematical model was focused on the extraction side of the liquid membrane system. The mass transfer coefficients of the aqueous phase (k <inf>i</inf> ) and organic phase (k <inf>m</inf> ) are 7.15×10 <sup>-3</sup> and 3.45×10<sup>-2</sup> cm/s for As(III), and 1.07×10<sup>-2</sup> and 1.79×10<sup>-2</sup> cm/s for As(V). Therefore, the rate-controlling step for As(III) and As(V) in liquid membrane process is the mass transfer in the aqueous film between the feed solution and liquid membrane. The calculated mass transfer coefficients agree with the experimental results. © 2008 Springer.