Kamonkarn Prikyai creator Visvanathan, C. Chairperson Rene, Eldon R. Examination committee Ekbordin Winijkul Examination committee Shipin, Oleg V. Examination Committee Royal Thai Government Fellowship Scholarship donor text theses th Pathum Thani, Thailand Asian Institute of Technology 2019 continuing eng

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112 leaves : ill. + 1 online resource The requirement of high surface area and rapid clogging of biomass is the major limitation of the conventional biological waste gas treatment. Whereas in an air membrane bioreactor (aMBR), these limitations can be easily overcome. The large gas-liquid surface area of air membrane bioreactor can enhance the mass transfer of pollutants and oxygen. It can operate under high inlet loading rate within a small compact reactor. A laboratory scale aMBR was evaluated for the removal of gas phase methanol from air. This research also studied the biodegradability of methanol by C. boidinii in the batch test. The result showed that the concentration of methanol decreased over time. The specific substrate utilization rate (SSUR) was 645 ug CH30H/g biomass·h. The system was loaded in the range between 2.5- 30 g m" of MeOH. Meanwhile, the performance of aMBR at different empty bed residence times (EBRT) of 30, 10 and 5 s was assessed. The maximum 98 % of removal efficiency (RE) at the inlet loading rates (ILR) up to 1,953 g rn" h were achieved at EBRT 30 s. The maximum elimination capacity (EC) of 8,644 g m' h' was observed when the system was operated at ILR ~ 9,353 g m-3 h' (RE 92 % at 30 s). The possibility of aMBR to deal with an upset situation was investigated under transient condition. Experimental results showed that the system can handle the fluctuation ofMeOH due to the results of only 5-10 % ofRE dropped during the shock load test. After that, MeOH removal could be restored within 1 - 2 days. Moreover, the results from High-Throughput Sequencing process showed the variety of microbial community structure which was distributed to the different times. Candida boidinii, Fusicolla merismoides and Xantobactor jlavus played important roles in the biodegradation of MeOH. All of these results show that MeOH waste gas was effectively degraded in this aMBR application. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management Thesis (M.Sc.) - Asian Institute of Technology, 2019 Membrane reactors Bioreactors Waste gases Recycling Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B05736 http://203.159.5.9/ait-thesis/detail.php?q=B05736 200826 20260818171603.0