Fluidized bed reactor for treatment of gaseous pollutant: Flourides a case study

Abstract

Gaseous effluent from Aluminium industry is treated under different operating conditions. Air and industrial gaseous effluent are used as fluidizing medium and secondary gas in the FBR respectively. The fluoride component from the effluent gas reacts with different metallic groups present in the bed materials. The exit gas was allowed to circulate back to the fluidizer for certain time period to allow proper contact among gaseous effluent and bed materials. Different bed materials are used at high temperatures to check the maximum reduction of fluorides from industrial gaseous effluent. The phase composition and structural transition of bed materials at different temperatures are analysed. Characterisation of bed materials before and after the experiments are carried out by several types of analysis like FT-IR, ICP-MS, FESEM, EDX, PSA, BET and XRD analysis. After the experiments, the presence of fluoride was confirmed through all characterisation techniques. Presences of NaF, AlF3, FeF2, and FeF3 in the bed material were confirmed by above mentioned analysis techniques. From these analysis reports, it can be concluded that abatement of fluorides from industrial effluents by FBR is confirmed, thereby implying the fluidized bed technique to be the most efficient technique for abatement of fluorides from gaseous effluents.