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In order to simulate the fouling of ultrafiltration (UF) membranes during an algal bloom, particularly by organic algal matter (AOMs), we undertook filtration tests of real seawater enriched with sodium alginate (SA) via a flat polyacrylonitrile (PAN) membrane integrated in an unstirred AMICON cell operating in frontal mode. The experiments showed that the permeate flux decrease was 60, 80, 85 and 90% for SA concentrations of 5, 10, 15 and 30 ppm, respectively, and this was most likely due to the accumulation of a thicker cake layer on the membrane surface. On the other hand, the addition of iron chloride (FeCl3 6H2O) as a coagulant allowed a reduction in the intensity of fouling when the coagulant concentration was increased. As for the impact of pH on the UF-coagulation process, the results showed that working at an acidic pH of 5 was more favorable in terms of reducing flux drop when the feed solution was dosed with 2.5 and 5 mg Fe3+/L.

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Coagulation-Ultrafiltration of Seawater Enriched with Algal Organic Matter (AOM)

  • 会议论文

  • 发表日期：

    2025年

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  • Mohamed Said Lebad,
  • Djamal Abdessemed

摘要

In order to simulate the fouling of ultrafiltration (UF) membranes during an algal bloom, particularly by organic algal matter (AOMs), we undertook filtration tests of real seawater enriched with sodium alginate (SA) via a flat polyacrylonitrile (PAN) membrane integrated in an unstirred AMICON cell operating in frontal mode. The experiments showed that the permeate flux decrease was 60, 80, 85 and 90% for SA concentrations of 5, 10, 15 and 30 ppm, respectively, and this was most likely due to the accumulation of a thicker cake layer on the membrane surface. On the other hand, the addition of iron chloride (FeCl3 6H2O) as a coagulant allowed a reduction in the intensity of fouling when the coagulant concentration was increased. As for the impact of pH on the UF-coagulation process, the results showed that working at an acidic pH of 5 was more favorable in terms of reducing flux drop when the feed solution was dosed with 2.5 and 5 mg Fe3+/L.