Understanding particle deposition kinetics on NF membranes: A focus on micro-beads and membrane interactions at different environmental conditions

Abstract

The significance of nanofiltration membrane surface properties when interacting with microbeads with and without permeate flux was investigated. This was achieved by characterising the surface tension and zeta potential of micro beads and NF90 membranes to determine the colloid-membrane interaction forces. Dynamic adhesion assays under different ionic strengths (0.1M and 0.01M) and pH (5, 7, 9) were conducted. Experimental results showed that at high ionic strength, pH does not have a significant effect on adhesion rates, while at low ionic strength the adhesion rate increased at pH 7 (4.56 s -1 cm -2 ) compared to pH 5 and pH 9, with rates of 2.69 and 3.

Harvesting microalgal biomass using negatively charged polysulfone patterned membranes: Influence of pattern shapes and mechanism of fouling mitigation

“…Interfacial Gibbs free energies at a minimum separation distance between membrane surface and microalgal cells were calculated based on the surface tension data from Table1 and are shown in Table 2. The contribution of EL free energy is normally a magnitude lower than that of LW and AB free energies and can be considered as negligible (Cao et al, 2015;Zhao et al, 2016a). The total interfacial Gibbs free energy ( 0 ) was therefore calculated by the sum of 0 and 0 .…”

Adhesion potential of bacteria retrieved from intake seawater and membrane biofilms on full-scale reverse osmosis desalination process

“…A recent study also reported that bacterial adhesion is influenced by more than electrostatic and hydrophobic interactions when there is a flux [45]. Model predictions indicated that the drag force overcome all other colloidsurface interaction forces when the flux increases to a certain level (7.2 L/h m 2 ) on NF membranes.…”

Enhanced microalgal biofilm formation and facilitated microalgae harvesting using a novel pH-responsive, crosslinked patterned and vibrating membrane

“…Interfacial Gibbs free energies were calculated based on the surface tension data (Table 2). The contribution of the EL free energy is normally a magnitude lower than that of LW and AB free energies and can be considered as negligible [54,62]. The total interfacial Gibbs free energy ( 0 ) was therefore calculated by the sum of 0 and 0 .…”