Development of a chemical-free technology for the control of bio-fouling on glass and polystyrene surfaces

• Main Author: Tan, Gabriel Hseng Ho.
• Other Authors: Liu Yu
• Format: Final Year Project
• Language: English
• Published: 2013
• Subjects: DRNTU::Science::Physics::Heat and thermodynamics
• Online Access: http://hdl.handle.net/10356/53817
• Institution: Nanyang Technological University

Research effort has been dedicated to develop new chemical-free technology for control and mitigation of membrane bio-fouling. In this report, the surface properties of glass and polystyrene materials and their relationship to the mass of biofilm formed are being investigated. Different parameters, such as the type of contact surface, the duration of air bubbling treatment time and the stability of microbubbles (MBs) in liquid, were varied and documented to determine the most efficient way of cleaning the bio-fouled surfaces. It is important to acknowledge that sole usage of MBs as a cleaning tool might not be entirely efficient, as this method is still in its developmental stage. Apart from conducting investigations for various combinations of other parameters coupled with generation of micro-bubbles to control membrane bio-fouling, this project aims to perform an in-situ cultivation of Staphylococcus Aureus cells to simulate real-life conditions of bio-fouling. Through crystal violet and SEM image analysis, it was observed that the Staphylococcus Aureus biofilm attached better to the polystyrene surface than to the glass surface after incubation for 24 hours. The relationship between the attachments of biofilm to the different surfaces due to the surface hydrophobicity is also investigated in this study. The report concludes by comparing the removal efficiency of biofilm for the two different types of surfaces and the significance of the microbubbling treatment to real-life situations.