Removal of Trichloroethylene from Waste Gases via the Peroxone Process in a Membrane Reactor

摘要

Ozone based Advanced Oxidation Processes (AOP’s) have become the subject for many researches for environmental applications. In these processes, ozone is dosed in the reactor together with hydrogen peroxide or UV-radiation leading to the production of highly reactive and non-selective hydroxyl radicals. This paper focuses on the removal of trichloroethylene (TCE) from waste gases in a membrane reactor. Ozone and TCE, both present in the gas phase dosed to the reactor, diffuse through a membrane to a liquid phase of deionised water with a certain concentration of hydrogen peroxide and a buffer to control the pH. The experimental setup and measuring procedure are extensively discussed and in the result section, the results of an example experiment are given. In this experiment, a gas stream was dosed to the reactor with a flow rate of 1.80E-6 m~3/s, a TCE concentration of 0.0358 mol/m~3 and an ozone concentration of 0.261 mol/m~3. The liquid phase in this example experiment had a flow rate of 6.742E-7 m~3/s, a pH of 7.1 and contains no hydrogen peroxide. The membrane was a porous membrane of pure PTFE. The temperature in the reactor was controlled at 30°C. The observed removal efficiency was equal to 11.2 %. The main goal of this research is the optimization of this removal efficiency by changing parameters like hydrogen peroxide addition, liquid flow rate, pH and O3/H2O2 concentration ratio.