Microalgal biofouling formation on tubular cellulose-ester membranes during dewatering by forward osmosis

• Published in: Biofouling (Chur, Switzerland) Vol. 39; no. 4; pp. 371 - 384
• Main Authors: Karamad Yazdanabad, Salma, Soriano Jerez, Yolanda, Samimi, Abdolreza, Shokrollahzadeh, Soheila, Mohebbi-Kalhori, Davod, Ibáñez González, María José, Mazzuca Sobczuk, Tania, Molina Grima, Emilio
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 21.04.2023; Taylor & Francis Ltd
• Subjects: Adhesion; Adhesive strength; Algae; Aquatic microorganisms; Biocompatibility; Biofilms; Biofouling; Cell culture; Cell surface; Cellulose; Cellulose - chemistry; Cellulose esters; Dewatering; Dialysis; Esters; forward osmosis; Fouling; Hydrophobicity; Membranes; Membranes, Artificial; Microalgae; Microalgae culture; Microalgal biofouling; Osmosis; Surface properties; Surface tension; thermodynamic approach; Thermodynamic models; Wastewater; Water Purification - methods; Wettability; XDLVO theory; Microalgal biofouling; forward osmosis; thermodynamic approach; XDLVO theory
• ISSN: 0892-7014; 1029-2454
• DOI: 10.1080/08927014.2023.2218282

This work assesses the biofouling formation of a microalgal consortium, cultivated in wastewater, on dialysis tubular membranes with no supporting layer, in both batch and continuous FO dewatering modes. The biological adhesion strength was compared with the predictions from the Baier and Vogler biocompatibility theories, employing critical surface tension ( ) and water adhesion tension (τ 0 ), respectively, as measurable parameters of surface wettability. The results indicate that most of the tested membranes presented amphiphilic surface characteristics (τ 0 =22 to 45 mJ.m −2 , θ W ≈ 65˚) with a minimal biological adhesion tendency, which is compatible with the Vogler criteria. However, the membrane exposed the longest time to the microalgal culture presented more hydrophobic characteristics and poor wettability. The existing thermodynamic models succeeded in predicting cell-cell and cell-surface interactions as a competitive phenomenon. Nevertheless, the XDLVO model was used to determine changes in the cell-to-surface attraction dynamics. This assessment of microalgal foulant-membrane interfacial interactions helps to enhance understanding of the fouling mechanisms present on a novel FO membrane surface.