Removal of Nitrate from Drinking Water by Liquid Membrane
Paper ID : 1328-MST2015-FULL
Authors:
Mohammad Pirmoradi *1, Seyed Nezameddin Ashrafizadeh2
1Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology
2Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology (IUST)
Abstract:
Nitrate removal from water was experimentally studied using both bulk and emulsion liquid membranes. The carrier used in the membrane phase was Dimethyldioctadecyl ammonium chloride which is an efficient carrier and shows high tendency to form a complex with nitrate. Where initial nitrate concentration in the feed phase was 150 mg/L, the extraction into the membrane phase and stripping in the aqueous receiving phase were 98.52% and 95.64%, respectively. Kinetic parameters comprising k1, k2, Rmmax, tmax, JFmax and JSmax were calculated using non-linear curve fitting by MATLAB software, PSO method which enables one to predict the different reduced concentrations including RF, RS and Rm. Results show that the predicted concentrations are in well agreement with the real ones. The effects of carrier concentration and stirring speed on the extraction were also studied. A comparison between the bulk liquid membrane process conducted in this work and previous BLM works for nitrate removal show the priority of the current developed process. In addition, the long-term performance of developed BLM was very acceptable due to its high extraction even after 60 hours. The same process was also examined via emulsion liquid membrane. Regarding the huge increase in interfacial area between the feed and membrane phases, the time of process was significantly decreased from 7 hours to less than 15 minutes. The emulsion liquid membrane exhibited a nitrate extraction of more than 95% while the membrane phase behaved quite stable.
Keywords:
Bulk Liquid Membrane; Emulsion Liquid Membrane; Nitrate; Extraction; Carrier
Status : Paper Accepted (Oral Presentation)