The elimination of trace arsenic via hollow fiber supported liquid membrane: experiment and mathematical model

Abstract

This work presents the elimination of arsenic ions from synthetic produced water via hollow fiber supported liquid membrane (HFSLM). Results demonstrate that arsenic ions in synthetic wastewater can be successfully treated to meet the wastewater standard as formulated by the Ministry of Industry and the Ministry of Natural Resources and Environment, Thailand. The discharged limit of arsenic from industrial wastewater must not be greater than 250 ppb. In a single-step operation, arsenic ions are extracted and stripped. Percentages of extraction and stripping proved to be 100% and 98%, respectively. Optimum conditions found proved to be 0.68 M Aliquat 336 dissolved in toluene as the liquid membrane, at pH 12 of feed solution, having a mixture of HCl and thiourea as the synergistic strippant, and flow rates of both feed and strippant solutions of 100 mL/min. A mathematical model, developed to predict the final concentration of arsenic ions in feed and strippant solutions, is seen to fit in well with the experimental results.

Synergistic effect of arsenic removal from petroleum condensate via liquid-liquid extraction: Thermodynamics, kinetics, DFT and McCabe-Thiele method

“…The extraction performance reached a maximum of 1 mol/L HCl, achieving an extraction percentage of 43.3 %. Once HCl concentration passed over 1 mol/L, extraction percentage slightly decreased [ 35 ]. Therefore, both 0.05 mol/L thiourea concentration and 1 mol/L HCl concentration were used for further experiments.…”

“…The arsenic compound in petroleum condensate is identified by Fourier-transform infrared spectroscopy (FTIR). The types of extractants investigated are based on extractants and stripping solutions which are aqueous solutions in previous studies, as shown in Table 2 [ 4 , 7 , [32] , [33] , [34] , [35] , [36] ]. Response Surface Methodology (RSM) based on Box-Behnken design (BBD) is employed to optimize the operating condition such as concentration of extractant and O/A ratio.…”