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    Comparing membrane and spacer biofouling by Gram-negative Pseudomonas aeruginosa and Gram-positive Anoxybacillus sp. in forward osmosis

    Year: 2019

    Journal: Biofouling, Volume 35, JAN 2, page 104–116

    Authors: Bogler, Anne; Rice, Douglas; Perreault, Francois; Bar-Zeev, Edo

    Organizations: Kreitman School for Advanced Graduate studies of Ben-Gurion University of the Negev, Israel

    Keywords: Forward osmosis; spacer modification; wastewater; biofouling; bacteria Gram-type

    Bacteria of different Gram-types have inherently different outer cell structures, influencing cell surface properties and bacterial attachment. Dynamic biofouling experiments were conducted over four days in a bench-scale forward osmosis (FO) system with Gram-negative Pseudomonas aeruginosa or Gram-positive Anoxybacillus sp. Biofouling resulted in similar to 10% decline in FO permeate water flux and was found to be significant for Anoxybacillus sp. but not for P. aeruginosa. Additionally, a stronger permeate water flux decline for P. aeruginosa in experiments with a superhydrophilic feed spacer demonstrated that mitigation methods require testing with different bacterial Gram-types. It was found that although permeate water flux decline can be affected by bacterial Gram-type the stable performance under enhanced biofouling conditions highlights the potential of FO for wastewater reclamation.
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