Membrane characterization and foulant cake analysis

• Main Author: Tan, Darryl Zheng Qiang.
• Other Authors: Tang Chuyang
• Format: Final Year Project
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Environmental engineering
• Online Access: http://hdl.handle.net/10356/39597
• Institution: Nanyang Technological University

Over the past decade, there has been an increase in the use of advanced membrane technologies for wastewater treatment. However, effluent water usually contain high amount of effluent organic matter (EfOM), contributing to membrane fouling which result in declining flux performance. Previous studies show that fouling is influenced by a variety of factors including feed water characteristics, membrane properties and operational condition. Hence, this report aims to study the effect these parameters on membrane fouling, whereby characterization of membrane and foulant cake analysis is carried out to provide evidences for the study. Results show that Scanning Electron Microscopy (SEM) imaging may only be a tool use to briefly investigate on the surface morphology of membrane. Protein fouling has the effect of increasing the hydrophobicity characteristic of membrane. Membranes fouled by a common feed protein will exhibit similar surface hydrophobicity, regardless of membrane type and foulant thickness. Solution pH has a large influence on electrostatic charge of feed protein molecule. At higher zeta potential, feed constituent possess stronger electrostatic repulsion force, creating greater barrier for foulant-foulant deposition on the membrane surface. At higher initial flux, the foulant is subjected to greater hydrodynamic drag force toward the membrane, resulting in greater decline in flux.