The polyamide composite nanofiltration membrane fouling experiments were carried out by using humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) as model organic macromoleculars, sodium metasilicate as model inorganic foulant in natural water. The adhesion forces of membrane-sodium metasilicate and sodium metasilicate-sodium metasilicate under different conditions were tested by atomic force microscopy (AFM) in conjunction with self-made colloidal probe. The surface structural characteristics of the fouled membranes and flux recovery rates of the corresponding fouled membranes were analyzed. Besides, the effects of different membrane surface conditions on silicate scaling behavior were investigated. The results showed that the negative potential of the membrane surface increased after adsorption of HA or SA on membrane surface. Hence, the electrostatic repulsion between the membrane and sodium metasilicate increased. Therefore, the binding capacity between fouled membrane and sodium metasilicate was weakened and the scaling behavior was mitigated. However, compared with the membrane without organic conditioning, adsorption of BSA on the membrane surface had little influence on silicate scaling of nanofiltration membrane owing to the similar negative potentials of the two kinds of membranes.
Jin L, Shi W, Yu S, et al. Composite nanofiltration membranes synthesized from PAMAM and TMC by interfacial polymerization[J]. Journal of Harbin Institute of Technology, 2012,19(1):116-120.
Mattaraj S, Jiraratananon R, Jarusutthirak C. Influence of inorganic scalants and natural organic matter on nanofiltration membrane fouling[J]. J. Membrane Science, 2007,287(1):138-145.
[6]
Mo Y, Xiao K, Liang P, et al. Effect of nanofiltration membrane surface fouling on organic micro-pollutants rejection:The roles of aqueous transport and solid transport[J]. Desalination, 2015, 367:103-111.
[7]
Verliefde A R D, Cornelissen E R, Heijman S G J, et al. Influence of membrane fouling by (pretreated) surface water on rejection of pharmaceutically active compounds (PhACs) by nanofiltration membranes[J]. Journal of Membrane Science, 2009,330:90-103.
[8]
Lee S, Elimelech M. Relating organic fouling of reverse osmosis membranes to intermolecular adhesion forces[J]. Environmental Science & Technology, 2006,40(3):980-987.
[9]
Li Q, Elimelech M. Organic fouling and chemical cleaning of nanofiltration membranes:measurements and mechanisms[J]. Environmental Science & Technology, 2004,38(17):4683-4693.
[10]
Lee S, Elimelech M. Salt cleaning of organic-fouled reverse osmosis membranes[J]. Water Research, 2007,41(5):1134-1142.
[11]
Hatziantoniou D, Howell J A. Influence of the properties and characteristics of sugar-beet pulp extract on its fouling and rejection behaviour during membrane filtration[J]. Desalination, 2002,148(1):67-72.
[12]
Mansouri J, Harrisson S, Chen V. Strategies for controlling biofouling in membrane filtration systems:challenges and opportunities[J]. J. Materials Chemistry, 2010,20(22):4567-4586.
[13]
Crozes G, Anselme C, Mallevialle J. Effect of adsorption of organic matter on fouling of ultrafiltration membranes[J]. Journal of Membrane Science, 1993,84(1):61-77.
[14]
Jermann D, Pronk W, Boller M. Mutual influences between natural organic matter and inorganic particles and their combined effect on ultrafiltration membrane fouling[J]. Environmental Science & Technology, 2008,42(24):9129-9136.
[15]
Liu Y, Mi B. Combined fouling of forward osmosis membranes:synergistic foulant interaction and direct observation of fouling layer formation[J]. J. Membrane Science, 2012,407:136-144.
[16]
Den W, Wang C J. Removal of silica from brackish water by electrocoagulation pretreatment to prevent fouling of reverse osmosis membranes[J]. Separation and Purification Technology, 2008,59(3):318-325.
[17]
Koo T, Lee Y J, Sheikholeslami R. Silica fouling and cleaning of reverse osmosis membranes[J]. Desalination, 2001,139(1):43-56.
[18]
Ning R Y. Discussion of silica speciation, fouling, control and maximum reduction[J]. Desalination, 2003,151(1):67-73.
Ang W S, Elimelech M. Protein (BSA) fouling of reverse osmosis membranes:Implications for wastewater reclamation[J]. Journal of Membrane Science, 2007,296(1/2):83-92.
[23]
Hashino M, Hirami K, Katagiri T, et al. Effects of three natural organic matter types on cellulose acetate butyrate microfiltration membrane fouling[J]. J. Membrane Science, 2011,379(1):233-238.
[24]
Wang L, Miao R, Wang X, et al. Fouling behavior of typical organic foulants in polyvinylidene fluoride ultrafiltration membranes:characterization from microforces[J]. Environmental Science & Technology, 2013,47(8):3708-3714.
[25]
Huisman I H, Prádanos P, Hernández A. The effect of protein-protein and protein-membrane interactions on membrane fouling in ultrafiltration[J]. J. Membrane Science, 2000, 179(1):79-90.
[26]
Costa A R, de Pinho M N, Elimelech M. Mechanisms of colloidal natural organic matter fouling in ultrafiltration[J]. J. Membrane Science, 2006,281(1):716-725.
[27]
Kang S, Asatekin A, Mayes A M, et al. Protein antifouling mechanisms of PAN UF membranes incorporating PAN-g-PEO additive[J]. J. Membrane Science, 2007,296(1):42-50.