Abstract
The oxidation of methyl tert-butyl ether (MTBE) by advanced oxidation processes in conjunction with biological treatment in investigated. Firsst, the degradation of MTBE by UV/H2O2 and UV/TiO2 is studied. It is found that the optimum molar ratio or H2O2/MTBE is about 14 while the optimum concentration of TiO2 is 1.5 g/L. In addition, it is observed that a combined process of UV/H2O2 and UV/TiO2 does not have any advantage over each of these processes alone. In the second phase, biodegradability of MTBE by aerobic microorganisms is evaluated in three different approaches including BODu assessment, removal of MTBE by non-acclimated, and acclimated microorganisms. It is shown that the acclimatization of microorganisms enhances the rate of biodegradation of MTBE. Finally, it is observed that the rate of bioreaction is not improved after a photochemical pre-treatment. It is also found that using the integration of photochemical and biological treatment reduced the total residence time.
Highlights
Today one o f the most important global issues is water because o f its limited and valuable sources in the world
It was indicated that in a continuously stirred tank reactor (CSTR), the addition o f H2O2 to O3 resulted in an increase o f the rate and degree o f methyl /e/V-butyl ether (MTBE) degradation, t-butyl formate (TBF), t-butyl alcohol (TBA), methyl acetate, and acetone were determined as products o f the reactions o f O3 and O3/H 2O2 with MTBE
Comparison between energy wasted during bacterial growth on MTBE and that o f TB A suggested that large energy expenditure v.-ss related to the breakage o f ether bond in methyl /erZ-butyl ether (M TBE), but still losses o f energy occurred after the initial step o f M TBE degradation to TB A
Summary
NPDOC: Non-Purgeable Dissolved Organic Carbon r: rate R: molar ratio o f H2O2 / M TBE RE; Removal Efficiency RFG: Reformulated Gasoline S : substrate concentration, mass/ volume SBR: Sequential Batch Reactor T: TiO] t: residence time, min TB A : /e/7-butyl alcohol TBF; /e/-/-butyl formate TOC: Total Organic Carbon, mg C/L TSS; Total Suspended Solid, mg/L V B : valance band. Tj : Efficiency v : frequency o f U V radiation H : specific bacterial growth rate, time''. Subsc rip ts 0 : initial B; biological reactor C: chemical reactor g: bacterial growth m: maximum S: substrate t: residence time T ; /e;7-butyl formate U: ultimate xvm ReDroduced with permission of the copyright owner.
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