| Airlift loop reactor has already been developing, and it is applied widely in the fields of chemical engineering, energy sources, environment protection and biochemical reaction. In this thesis, research on airlift loop bioreactor used for degrading two-composition VOCs(volatile organic compounds) is carried out. Firstly, the role of non-biological factors including frame of reactor, inflow, temperature, pH value affect biodegradation on ethyl acetate or ethanol, is investigated. Then, the influences of those factors on two-composition in-gas degradation are studied also. Finally, the impact of biological factors —cooperation and co-metabolism on biodegradation is discussed. One can easily find that from the experimental results: the course, in which ethyl acetate or ethanol degraded in bioreactor, is "reaction limited". The optimal conditions for biodegrading ethyl acetate are temperature of 25~30℃,pH of 7, flux of 0.05m3/h, and the maximal elimination capacity of 472.23g/m3 reactor/h . Similarly, those for biodegrading ethanol are temperature of 25~30℃,pH of 5, flux of 0.06m3/h, and the maximal elimination capacity of 712.9g/m3 reactor/h . Moreover, the reactor for degrading ethyl acetate or ethanol is also stable in the long operation. The optimal conditions for biodegrading two-composition VOCs are temperature of 30℃,pH of 6, flux of 0.055m3/h. The reactor remains rather stable in the course of two-composition biodegradation. The elimination capacity on two-composition VOCs of reactor is higher than that of sole-composition VOC. By comparison, two types of microbe for biodegrading two different VOCs cooperate and promote biodegradation each other.
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