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Increased power density with low salt flux using organic draw solutions for pressure-retarded osmosis at elevated temperatures
Desalination ( IF 9.9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.desal.2020.114420
Suman Adhikary , Md. Shahidul Islam , Khaled Touati , Sormin Sultana , Amruthur S. Ramamurthy , Md. Saifur Rahaman

Abstract Pressure retarded osmosis (PRO) is an emerging technology that uses salinity gradients to produce energy. In this study, the impact of temperature on PRO performances is investigated when operating with an organic draw solution. These results are compared to PRO performances while using the commonly used solute sodium chloride (NaCl) as a draw solution. It has been observed that NaCl draw solution (1 M) can produce almost ~34% (6.7 Wm−2 to 9.0 Wm−2) more energy when the temperature is increased from 20 °C to 40 °C. However, high reverse salt flux was encountered. In addition, potassium acetate and sodium propionate show a ~31% (8.5 Wm−2 to 11.1 Wm−2) and ~27% (8.1 Wm−2 to 10.3 Wm−2) increase in power density when increasing the temperature from 20 °C to 40 °C. It was found that reverse salt flux while using these organic salts is ~5 to 8 times lower when compared to NaCl. A comparison shows that at 40 °C, potassium acetate and sodium propionate produce 23% and 14.5% higher power density, respectively, over NaCl solutions. Based on these results, increased energy at higher temperatures, coupled with lower reverse salt flux, have demonstrated the potential of using organic salts as a draw solution in future research towards a feasible PRO process.

中文翻译:

使用有机汲取溶液在升高的温度下进行压力延迟渗透,以低盐通量增加功率密度

摘要 压力延迟渗透 (PRO) 是一种利用盐度梯度产生能量的新兴技术。在这项研究中,研究了使用有机汲取溶液操作时温度对 PRO 性能的影响。将这些结果与使用常用溶质氯化钠 (NaCl) 作为汲取溶液时的 PRO 性能进行比较。据观察,当温度从 20 °C 增加到 40 °C 时,NaCl 汲取溶液 (1 M) 可以产生近 34%(6.7 Wm-2 至 9.0 Wm-2)的能量。然而,遇到了高反向盐通量。此外,当温度从 20° 升高时,醋酸钾和丙酸钠显示出~31%(8.5 Wm-2 至 11.1 Wm-2)和~27%(8.1 Wm-2 至 10.3 Wm-2)的功率密度增加C 至 40 °C。发现与 NaCl 相比,使用这些有机盐时的反向盐通量低约 5 到 8 倍。比较表明,在 40 °C 时,乙酸钾和丙酸钠产生的功率密度分别比 NaCl 溶液高 23% 和 14.5%。基于这些结果,在较高温度下增加能量,加上较低的反向盐通量,已经证明了在未来研究可行的 PRO 过程中使用有机盐作为汲取溶液的潜力。
更新日期:2020-06-01
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