Biofouling affinity of membrane surfaces under quiescent conditions

Morphological visualization, componential characterization and microbiological identification of membrane fouling in membrane bioreactors (MBRs)

“…A recent study performed by Tansel et al [23] demonstrated that after exposure to the bioreactor effluent, the roughness of four membranes (BW30LE RO membrane, DOW; ESPA1 RO membrane, Hydranautics, California; NF90 membrane, DOW; UF-EW membrane, Sterlitech Corp., Washington), based on AFM quantification, significantly increased with the exception of NF90. As shown in Fig.…”

“…4. Mean roughness of membranes before and after exposure to ARMS effluent (drawn after [23]). (132 nm) was rougher than that formed with sludge supernatants or SMP solution (75 nm).…”

“…AFM has been thought as an extremely powerful tool for membrane fouling study both in MBRs and in conventional membrane filtration processes [11,[22][23][24]. It can provide three-dimensional (3D) images with resolution at around atomic level and quantitative information of cake morphology with the aid of the associated analysis software.…”

Competitive effects and interactions during sorption of SMP fractions on activated carbon: Response surface approach for visualization of sorption profiles

“…SMP represent a significant fraction of soluble chemical oxygen demand (COD) in effluents from biological treatment processes (Chalor and Gary, 2007;Janga et al, 2007;Rosenberger et al, 2006;Shon et al, 2004;Jarusutthirak et al, 2005). SMP could inhibit the nitrification process, affect biofilm structure, viscosity, hydrophobicity, flocculation, and other physical characters of the sludge (Tansel et al, 2008;Ni et al, 2008;Reid et al, 2006) and result in operational problems in membrane bioreactors and downstream treatment (Chuang et al, 2009;Kornboonraksa et al, 2009;Tansel et al, 2006Tansel et al, , 2005. However, activated carbon is extensively used in wastewater treatment for removal of organic and inorganic pollutions (Uygur and Kargi, 2004;Sirianuntapiboon et al, 2007;Tansel and Nagarajan, 2004).…”

Multiparametric investigation of competitive and noncompetitive sorption characteristics of SMP fractions (carbohydrate and protein) on activated carbon

“…In addition, SMP in the biological effluents can affect the performance of downstream treatment processes. For example, SMP may affect the biofilm structure, viscosity, hydrophobicity, flocculation characteristics and other physical properties of the sludge [9][10][11][12].…”