POLLUTED SITES REMEDIATION: STUDY OF PCE DEGRADATION WITH KMNO4 SOLUTIONS
The purpose of our research is to study at laboratory scale the oxidation of the DNAPLPCE in saturated model porous medium using KMnO4 solutions. The degradation process takes place in the solution by the oxidation of the dissolved PCE by the KMnO4. Consequently, the process is composed by the transfer of the PCE from the DNAPL in the solution, followed by the chemical oxidation (3.5<pH<12): 3 C2Cl4+4 KMnO4+4 H2O→6 CO2+4 MnO2+4 KCl+8 HCl Batch reactor experiments have been performed in order to obtain the global kinetic model of the homogenous process and to characterize the transfer of PCE from the DNAPL to the solution, coupled or not with oxidation. The dissolution process allows to determine the mass transfer coefficient. The calculated Ha number for the oxidation experiments (0.1<Ha<4) show the influence of the initial KMnO4 concentration on the global kinetic regime of the process. The DNAPLPCE degradation process in a model porous medium was investigated in a column fulfilled with mono-disperse siliceous sand. RTD analysis has been used to characterize the hydrodynamic. Well known volumes of PCE were injected in the saturated sand bed. The upstream flow is kept constant and the concentration of the species has been periodically analysed in the outflow. The mass transfer coefficient, kL=2*10-6 ms-1,was determined by the dissolution test while the interface area was estimated from literature data. The calculated Ha numbers (0.13<Ha<3.67) are similar to the biphasic reactor process.
DNAPL perchloroethylene oxidation porous media ISCO
M. Draga A. Fernandez R. Barna
Université de Toulouse; Mines Albi; CNRS; Campus Jarlard; F-81013 ALBI cedex 09, FRANCE Ecole des Mi UMR5504, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, CNRS, INRA, INSA, F-31400 Toulo
国际会议
北京
英文
800-805
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）