Combining Advanced Oxidation Processes in Attached Growth Membrane Bioreactor for Treating Polluted Surface Water

Lu Li, Thanwarat Chan, Chettiyappan Visvanathan



The continuous increment of organic pollution in surface water has brought new challenges to conventional drinking water treatment processes. Attached growth membrane bioreactor (aMBR) has been reported as an attractive technical solution, effective in removing biodegradable organic fractions. While the recalcitramt such as synthetic organic matters (SOM), natural organic matters (NOM) and the other non-biodegradable components were remain untreated. This study investigated the possibility of combining UV/O3 process as a recirculation phase into aMBR system. Improving the biodegradability of recalcitrant in aMBR permeate by UV/O3 process and then send back to be treated in aMBR system. The aMBR system combined with UV, O3 and UV/O3 system were tested and analyzed, respectively. Results indicated that aMBR+UV/O3 process has much higher removal performance than aMBR+UV or aMBR+O3. FEEM analysis and differential FDOM results indicated that UV/O3 was able to largely remove recalcitrant and improve biodegradability of aMBR permeate. UV/O3 synergy provided higher contribution to recalcitrant removal than simple addition of UV and O3. This study indicated that UV/O3 has potential to be used as a recirculation phase in aMBR system for treating polluted surface water.

Keywords:  Advanced oxidation processes (AOPs); UV/O3; fluorescence excitation emission matrix (FEEM); attached growth membrane bioreactor (aMBR); polluted surface water