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<p>Ceramic membranes provide an ideal solution for high-temperature geothermal waters, however their larger pore size filtration effectiveness. According to the research conducted, there are no studies on using polyol-supported ceramic membranes for boron removal from geothermal waters. This study investigates polyol-assisted (mannitol, sorbitol, and xylitol) boron removal from model and real geothermal waters using a ceramic tight-ultrafiltration (1&#xa0;kDa) membrane under optimized operating conditions. The study showed that boron removal efficiency varied significantly depending on solution pH, membrane pressure and the type of polyol used. In sorbitol-added model geothermal water, the highest boron removal with 41% was obtained at 20&#xa0;ppm boron concentration, pH 9.5, and 4&#xa0;bar pressure. Similarly, at 10&#xa0;ppm boron concentration (with mannitol addition), 38% boron removal was achieved, and the boron concentration in the filtrate was reduced to ~ 6&#xa0;ppm. In real geothermal water, the highest boron removal efficiency of 34% was observed with sorbitol polyol at 4&#xa0;bar pressure and pH 9.5. However, the treated water’s boron concentration remained between ~ 12–14&#xa0;ppm, exceeding agricultural irrigation standards (≤ 0.5&#xa0;ppm). Boron removal was enhanced by the formation of borate ions at pH 9.5. Borate ions were more effectively retained by the ceramic membrane through stable complexes with polyols. These results highlight the potential of ceramic membranes and polyols for boron removal from geothermal waters. Additional treatment and hybrid processes are required to meet irrigation standards and improve process efficiency.</p> Graphical Abstract <p></p>

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Enhanced boron removal with polyols from geothermal waters by ceramic membrane

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • S. Acar Can,
  • B. I. Harman,
  • H. Koseoglu

摘要

Ceramic membranes provide an ideal solution for high-temperature geothermal waters, however their larger pore size filtration effectiveness. According to the research conducted, there are no studies on using polyol-supported ceramic membranes for boron removal from geothermal waters. This study investigates polyol-assisted (mannitol, sorbitol, and xylitol) boron removal from model and real geothermal waters using a ceramic tight-ultrafiltration (1 kDa) membrane under optimized operating conditions. The study showed that boron removal efficiency varied significantly depending on solution pH, membrane pressure and the type of polyol used. In sorbitol-added model geothermal water, the highest boron removal with 41% was obtained at 20 ppm boron concentration, pH 9.5, and 4 bar pressure. Similarly, at 10 ppm boron concentration (with mannitol addition), 38% boron removal was achieved, and the boron concentration in the filtrate was reduced to ~ 6 ppm. In real geothermal water, the highest boron removal efficiency of 34% was observed with sorbitol polyol at 4 bar pressure and pH 9.5. However, the treated water’s boron concentration remained between ~ 12–14 ppm, exceeding agricultural irrigation standards (≤ 0.5 ppm). Boron removal was enhanced by the formation of borate ions at pH 9.5. Borate ions were more effectively retained by the ceramic membrane through stable complexes with polyols. These results highlight the potential of ceramic membranes and polyols for boron removal from geothermal waters. Additional treatment and hybrid processes are required to meet irrigation standards and improve process efficiency.

Graphical Abstract