Removal of recalcitrant pollutant by hybrid catalytic ozonation membrane separation

• Main Author: Siew, John Li An
• Other Authors: Lim Teik Thye
• Format: Final Year Project
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Environmental engineering
• Online Access: http://hdl.handle.net/10356/78491
• Institution: Nanyang Technological University

The paper aims to explore use of catalytic ozonation and ceramic membrane filtration in a hybrid system for the deterioration of clofibric acid. The ceramic membrane was coating with Mn-doped cerium oxide by using citrate sol-gel with wet impregnation method. Characterization of catalytic ceramic membrane for surface morphology was done via FESEM-EDX. Performance of the catalytic ceramic membrane was determined by a novel Hybrid Oxidation Separation Technology (HOST) system. Mn-doped cerium oxide impregnated catalytic ceramic membrane was able to achieve 20.3% TOC removal. It also displayed higher micropollutant mineralization ability of 2.5 mg O3 mg-1 TOC removal while original ceramic membrane only achieved 14.3 mg O3 mg-1 TOC removal. The mechanism of the heterogeneous catalytic ozonation by the fabricated catalytic ceramic membrane was suggested, involving the generation of hydroxyl radicals from surface hydroxyl groups. These serve as active sites and depending on the pH, the surface hydroxyl will get either deprotonated or protonated.