Ozone treatment is among the most advanced treatment processes applied for water and wastewater treatment. In order to achieve higher level of treatment, ozone gas must be dissolved effectively and rapidly into the liquid phase. Therefore, advancements in the area of ozone contacting technology are needed. A joint University of Alberta/Mazzei Injector Corporation (MIC) experimental study investigated the ozone mass transfer efficiency in the GDT? process. In this process, a flash mix reactor following an MIC? injector was used for ozone dissolution. The objectives of this study were to determine the autodecomposition kinetics of the sample liquid (tap water), the mixing characteristics inside the flash mix system, and the ozone mass transfer characteristics of the flash mix system at low to high ozone feed gas concentrations. The ozone transfer efficiency (OTE) and the volumetric liquid mass transfer coefficient (kLa) were obtained as measures of the ozone mass transfer under a wide range of operating conditions. Liquid flow rates ranged from 18.5 to 38.8 Lmin-1 -with the gas-to-liquid ratio in the range of 0.003 to 0.237. The back pressure on the system was varied from 24.8 to 102.0 kPa. High ozone mass transfer efficiency was achieved in the GDT? process. A comparison between the performance of this ozone dissolving process and other existing processes is presented. Mechanistic models were developed and tested for predicting the performance of the ozone mass transfer process in the
展开▼
