TY - JOUR
T1 - Polyvinyl chloride (PVC) ultrafiltration membrane fouling and defouling behavior
T2 - EDLVO theory and interface adhesion force analysis
AU - Fu, Wanyi
AU - Wang, Lan
AU - Chen, Fangjuan
AU - Zhang, Xuezhi
AU - Zhang, Wen
N1 - Funding Information:
This work was supported by the NSF Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology [Grant no. IIP1034710 ]; the National Natural Science Foundation of China project Membrane Fouling Mechanisms Caused by Algogenic Organic Matter (AOM) and its Mitigation during Microalgae Harvesting Process (No. 31672625 ). The authors also thank Dr. Yuan Xiao (Institute of Hydrobiology, Chinese Academy of Science) for the help in SEM imaging and AFM measurement.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/10/15
Y1 - 2018/10/15
N2 - To unravel fouling and defouling mechanisms of protein, saccharides and natural organic matters (NOM) on polymeric membrane during filtration, this study investigated filtration characteristics on polyvinyl chloride (PVC) ultrafiltration membranes with bovine serum albumin, dextran, humic acid as model foulants. Membrane fouling and defouling performances were analyzed through monitoring the flux decline during filtration and flux recovery during physical backwash. Physico-chemical properties (e.g., hydrophobicity and surface charge) of PVC membrane and foulants were characterized, which were used in the extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory to calculate the interaction energies between membrane-foulant and foulant-foulant. The results showed that at the later filtration stages the fouling rate was strongly correlated with the deposition rate, which was determined by the interaction energy profile calculated by EDLVO. Moreover, the adhesion forces of membrane–foulant and foulant–foulant were further measured by atomic force microscopy (AFM) with modified colloidal probes. A positive correlation (R2 = 0.845) between particle detachment rate (determined by adhesion force) and defouling rate was developed for BSA and HA foulants that led to cake layer formation. By contrast, dextran defouling rate was off this correlation as dextran partially clogged membrane pores due to its smaller size.
AB - To unravel fouling and defouling mechanisms of protein, saccharides and natural organic matters (NOM) on polymeric membrane during filtration, this study investigated filtration characteristics on polyvinyl chloride (PVC) ultrafiltration membranes with bovine serum albumin, dextran, humic acid as model foulants. Membrane fouling and defouling performances were analyzed through monitoring the flux decline during filtration and flux recovery during physical backwash. Physico-chemical properties (e.g., hydrophobicity and surface charge) of PVC membrane and foulants were characterized, which were used in the extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory to calculate the interaction energies between membrane-foulant and foulant-foulant. The results showed that at the later filtration stages the fouling rate was strongly correlated with the deposition rate, which was determined by the interaction energy profile calculated by EDLVO. Moreover, the adhesion forces of membrane–foulant and foulant–foulant were further measured by atomic force microscopy (AFM) with modified colloidal probes. A positive correlation (R2 = 0.845) between particle detachment rate (determined by adhesion force) and defouling rate was developed for BSA and HA foulants that led to cake layer formation. By contrast, dextran defouling rate was off this correlation as dextran partially clogged membrane pores due to its smaller size.
KW - AFM
KW - Adhesion force
KW - Defouling kinetics
KW - EDLVO theory
KW - Membrane fouling
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U2 - 10.1016/j.memsci.2018.07.020
DO - 10.1016/j.memsci.2018.07.020
M3 - Article
AN - SCOPUS:85049947172
SN - 0376-7388
VL - 564
SP - 204
EP - 210
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -