Experimental Study of Biodegradation of Ethanol and Toluene Vapors

LIST OF FIGURES
Figure 3-1. Schematic of the Experimental Apparatus …………………….39
Figure 4-1 Determination of toluene mass transfer coefficients……………46
Figure 4-2a Ethanol mass transfer results at air flow
rate of 2.0 L/min and 450 rpm ……………………………….48
Figure 4-2b. Ethanol mass transfer results at air
flow rate of 3.8 L/min and 300 rpm ………………………….48
Figure 4-3. Effects of ethanol concentration and impeller speed
on oxygen mass transfer coefficients ………………………50
Figure 4-4. Experimentally measured bubble diameters in the
well-mixed bioreactor (error bars are standard deviations)…...53
Figure 4-5. Ethanol air stripping coefficients at ethanol
concentration of 8.6 g/L ………………………………………56
Figure 4-6 Toluene air stripping coefficients at toluene liquid
concentration of 440 mg/L……………………………………57
Figure 4-7. Batch growth of P. putida on ethanol at S 0 =2.3 g/L,
air flow rate of 0.4 L/min, 450 rpm and 25.0 o C ……………...59
Figure 4-8 Comparison of results from two independent runs of
batch growth of P. putida on ethanol ………………………60
Figure 4-9a. Batch growth on benzyl alcohol at different initial
concentrations of 0.7 and 1.0 g/L……………………………62
Figure 4-9b. Batch growth on benzyl alcohol at different initial
concentrations of 2.1 g/L to 4.0 g/L…………………………63
Figure 4-10. Inhibitory Effect of benzyl alcohol on growth of P. putida……63
Figure 4-11. Continuous removal of ethanol from a polluted gas stream by
Pseudomonas putida at a dilution rate of 0.1h -1 and 25.0°C,
and at inlet ethanol concentrations of 15.9 and 19.5 mg/L ……65
Figure 4-12. Continuous removal of ethanol from a polluted air stream by
Pseudomonas putida at dilution rate of 0.1h -1 and 25.0°C,
and inlet ethanol concentrations of 15.9 and 25.0 mg/L ……66
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