THE STUDY OF OXYGEN MASS TRANSFER COEFFICIENTS IN DIFFUSED AERATION SYSTEMS

• Main Authors: Sheng-Ping Yang, 楊勝評
• Other Authors: Jia-Ming Chern
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/13816782531962346378

碩士 === 大同工學院 === 化學工程研究所 === 87 === A new oxygen mass-transfer model was used to analyze the unsteady-state reaeration data of batch diffused aeration systems in order to find the volumetric mass-transfer coefficients that can be used to estimate the emission rate of volatile organic compounds from the same aeration systems. A series of unsteady-state reaeration tests in a diffused aeration tank were performed to validate the model. Another series of tests with water impingement were performed to simulated the aeration in equalization tanks. The diffused air flow rate was varied from 8.45 ’ 10-4 to 2.45 ’ 10-3 m3/s. The water temperature was varied from 17.7 to 34.7 ℃. The water depth was varied from 0.6 to 1.8 m. The impinging water flow rate was varied from 6.67 ’ 10-5 to 2.00 ’ 10-4 m3/s. The water droplet temperature was varied from 18.4 to 31.3 ℃. The impingement drop height was varied from 0.6 to 1.4 m. Both the ASCE and the new oxygen mass-transfer models were used to analyze the unsteady-state reaeration data. Empirical equations were used to successfully correlate the volumetric mass-transfer coefficients as functions of operating parameters.