Processing Of Dichloromethane Gas By Absorption Combined With Photoassisted Oxidation

In this paper, simulated dichloromethane gas was absorbed and treated by UV, H2O2, Fenton, UV/H2O2 and UV/Fenton systems. Results shows that UV/H2O2 system performs very well. Further study was focused on the impacts of pH, flow rate, the dosage of H2O2 and the light intensity on the removal efficiency of dichloromethane. The optimal operating conditions are found to be:the flow rate is 200ml/min, the dosage of 30% H2O2 is 1.5ml (it also means that the concentration of H2O2 is 0.18g/L) and the power of UV lamp is 8W. simulated dichloromethane gas (the flow rate is 0.6L/min and the concentration is 1800mg/m3) was treated under this condition, results shows that the removal efficiency of dichloromethane stays 48% in 4 hours.We also paid attention to the kinetics of the oxidation reaction. After the static reaction experiments, we could draw a conclusion that if the UV light intensity is unchangeable and equally distributed, all the reactants are equally distributed and the dosage of H2O2 is superfluous, the oxidation of dichloromethane would perform as a first-order reaction.