Fate of chlorinated benzenes in laboratory peat and pozzolona fitters

International audienceThe removal of chlorinated benzenes (CBs) from the compartments and polluted industrial sites is of great public interest for the decontamination of polluted waters and protecting the environment. Biological degradation could be considered as a feasible process to eliminate these compounds from the environment as soil or groundwater.Biological degradation could be seen as a process can be eliminated these compounds in the environment as soil or groundwater. A research program in progress since the year 2007 was initiated to investigate the capacity of eco-remediation of CB-contaminated groundwater using a pilot-scale subsurface flow constructed wetland.A research program in progress since 2007 has been launched to investigate the ability of eco-remediation of contaminated groundwater using a CB wetland pilot scale subsurface flow constructed. In order to assess the removal efficiency of these compounds and to evaluate the biological activities, column experiments were performed.In order to evaluate the removal efficiency of these compounds and to evaluate the biological activities, experiments were carried out column. The fate of three CBs was investigated by feeding spiked tap water through laboratory columns filled with two different solid-state materials: peat and pozzolana.The fate of three CBS was studied by feeding of tap water spiked through laboratory columns filled with two different semiconductor materials: peat and pozzolana. In order to stimulate biological activity, organic matter coming from aged vertical flow constructed wetland was added to the media.In order to stimulate biological activity, organic matter from the vertical flow wetlands constructed age was added to the press. Concentrations of CBs in water effluent and in air and biological activities were monitored during 4 months.breakers concentrations in effluents and in the activities of air and biological parameters were monitored for 4 months. At the end of the experimental period, CB concentrations in the depth of columns were determined and a mass balance was calculated for the CBs.At the end of the experimental period, concentrations of CB in the depth of the columns were determined and mass balance was calculated for CBS. Removal efficiencies of the laboratory columns were >98% in the peat columns and situated around 87% to 95% in the pozzolana columns, indicating the suitability of the experimental systems for the removal of CBs.The removal efficiency of the laboratory columns were> 98% in the columns of peat and located around 87% to 95% in the columns of pozzolana, indicating the relevance of experimental systems for the removal of CBS. Higher effluent CB concentrations from the pozzolana columns were detected.Higher concentrations of CB effluents from the columns pozzolana were detected. Concentration of CBs in ambient air indicates that volatilization was low.breakers concentration in ambient air indicate that volatilization is low. ATP monitoring, reduction of tetrazolium violet, and exopolysaccharide determination indicated considerable biological activity with variations according to column depth and carrier material.ATP monitoring, reduction of tetrazolium violet, and exopolysaccharide determination indicated significant biological activity with variations depending on the depth and column support material