Boron removal and its concentration in aqueous solution through progressive freeze concentration.
This study explored the feasibility of progressive freeze concentration in boron removal and its concentration in aqueous solution. The influence of three key parameters in progressive freeze concentration on boron removal and concentration, namely, the advance speed of the ice front, the circumferential velocity of the stirrer, and the initial boron concentration, are investigated by conducting batch experiments. The results show that the effectiveness of boron removal increases with a lower advance speed of the ice front, a higher circumferential velocity of the stirrer, and a lower initial boron concentration. For a model boron solution with an initial concentration of 100 mg/L, the boron concentration in the ice phase after progressive freeze concentration is below 1 mg/L when the advance speed of the ice front is lower than 1 cm/h and the circumferential velocity of the stirrer is higher than 0.12 m/s. In addition, the concentration of boron in the liquid phase occurs simultaneously with progressive freeze concentration. Furthermore, the results also suggest that this method can be applied to the purification and concentration of not only organic molecules but also inorganic ions.
a Institute of Environmental Engineering and Management, College of Engineering , National Taipei University of Technology , Taipei , Taiwan , Republic of China.
Li Pang
LP
Wang
D001895:Boron / Q000737:chemistry*; D005615:Freezing; D006863:Hydrogen-Ion Concentration; D018508:Water Purification / Q000379:methods*
D001895:Boron
Progressive freeze concentration; boron; boron removal; effective partition constant; freeze concentration