Ozone Mass Transfer Analysis of an Injector with aFlash Mix Reactor

摘要

Ozone treatment is among the most advanced treatment processesrnapplied for water and wastewater treatment. In order to achieve higherrnlevel of treatment, ozone gas must be dissolved effectively and rapidlyrninto the liquid phase. Therefore, advancements in the area of ozonerncontacting technology are needed. A joint University of Alberta/MazzeirnInjector Corporation (MIC) experimental study investigated the ozonernmass transfer efficiency in the GDT? process. In this process, a flashrnmix reactor following an MIC? injector was used for ozone dissolution.rnThe objectives of this study were to determine the autodecompositionrnkinetics of the sample liquid (tap water), the mixing characteristicsrninside the flash mix system, and the ozone mass transfer characteristicsrnof the flash mix system at low to high ozone feed gas concentrations.rnThe ozone transfer efficiency (OTE) and the volumetric liquid massrntransfer coefficient (kLa) were obtained as measures of the ozone massrntransfer under a wide range of operating conditions. Liquid flow ratesrnranged from 18.5 to 38.8 Lmin-1 -with the gas-to-liquid ratio in thernrange of 0.003 to 0.237. The back pressure on the system was variedrnfrom 24.8 to 102.0 kPa. High ozone mass transfer efficiency wasrnachieved in the GDT? process. A comparison between thernperformance of this ozone dissolving process and other existingrnprocesses is presented. Mechanistic models were developed and testedrnfor predicting the performance of the ozone mass transfer process in the