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.
Highlights
This work presents the elimination of arsenic ions from synthetic produced water via hollow fiber supported liquid membrane (HFSLM)
In effect, treated produced water, from offshore oil and gas production, which has toxic metal over the discharge limits is re-injected into the rock formations from where the oil and gas originated[7]
The results of this study obviously reveal that the respond surface plot is economically useful as Aliquat 336 is much more expensive than NaOH, which was used to adjust the pH of feed solution
Summary
This work presents the elimination of arsenic ions from synthetic produced water via hollow fiber supported liquid membrane (HFSLM). The concentration of arsenic from various wells is found between 1 and 4 ppm (parts per million or mg/L)[5] Both the Ministry of Industry and the Ministry of Natural Resources and Environment, Thailand, have stipulated that the amount of arsenic in wastewater discharges should be no higher than 250 ppb[6]. In effect, treated produced water, from offshore oil and gas production, which has toxic metal over the discharge limits is re-injected into the rock formations from where the oil and gas originated[7]. Results showed that HFSLM could remove chromium(VI) from industrial waters and spiked natural waters at an extremely low concentration of μg/L level. The system enabled both the separation and enrichment of the metal within a singlestep operation. Ni’am et al.[12] utilized HFSLM for the extraction and stripping of dysprosium, praseodymium and Scientific Reports | (2021) 11:11790
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