| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 93 === The oil fumes include liquid and gaseous harmful substances, such as cyclic organic compounds and polar polymer etc. At present, the domestic kitchen ventilators in the house and the electrostatic precipitator and wet scrubber used by food industry are used to treat oil fumes. The principle of the treatment is to collect the waste oil and cooking smokes with the waste water and discharge it to the sewer. This method did not really treat oil fumes efficiently. Therefore the study tries using microorganism to degrade the liquid oil fumes which include soybean oil and two harmful substances, acrylamide and acrolein.
Five petroleum degradation bacteria strains were isolated from Taiwan environment. They were identified as Pseudomonas aeruginosa DS-4, Pseudomonas stutzeri MO-1, Aeromonas hydrophila B-1, Pasteurella haemolytica TO-3 and Pseudomonas vesiculari s XY-2.
At first, soybean oil is as the carbon source. The five strains are cultured respectively in the shaker flask. To screen the best bacteria strains combination, which are DS-4 and MO-1. The best oil degrading efficiency of biofilter in experimental group is up to 99.98% in 13 days.
The result indicates that the oil degrading efficiency in liquid culture is better than that in the biofilter. The oil degrading efficiency in liquid culture is more than 90% in 66 hours, while it needs to take 13 days to reach the same effect in the biofilter. In order to improve the treatment efficiency and cutdown the cost, we’ll simulate the contact aeration process to try the pilot experiment by using a bioreactor. The experimental group is to be added sponge support and its oil degrading efficiency is up to 99% in 4 days, and the microorganism grow well. While the oil degrading efficiency is only 52％ in the control bioreactor because there is no sponge support to where microorganism can attach to grow.
At final, the degrading test of traditionally harmful substance in oil fumes is carried out in the shaker flask culture; the acrylamide can be removed completely in 96 hours. Although the acrolein is volatile, there is still some part biodegraded. It shows that the combination of DS-4 and MO-1 can remove the harmful compositions effectively.
To sum up the results of experimental tests, a bioreactor of contact aeration process will be performed in the full-scale experiment in the future to get the result of removing oil fumes and investigate the further study about the treatment expenses and time.
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