Search

AbstractThis study examines the use of the coupling of electro-coagulation (EC) and biological treatment of mature landfill leachate from a non-hazardous waste storage characterized by a relatively low Chemical oxygen demand (COD) and a low BOD5/COD with a low biodegradability and a high level of inorganic compound such as . During electro-coagulation treatment, a decrease in the chemical oxygen demand (COD) was shown with an increase in the current density. A toal of 33 and 56% COD removal were respectively obtained with 23 and 95 A m−2. However, nothing was observed concerning the removal of ammonium. Nevertheless, biological treatment with or without addition of activated sludge (AS) has allowed the decrease in ammonium with a yield of 62% after 166 h. However, with the addition of activated sludge, the efficiency of nitrification is increased by 10%. As the bioaugmentation with AS has not improved the removal of organic matters and that the electrochemical treatment is not appropriate for removing NH4+, coupling treatment such as EC-biotreatment was envisaged. An integrated process involving electro-coagulation as pre-treatment of biological treatment to treat mature leachate appeared therefore relevant in the tested conditions at 23 A m−2with a 15 and 98% global removal, respectively, of COD and NH4+.

This study examines the use of the coupling of electro-coagulation (EC) and biological treatment of mature landfill leachate from a non-hazardous waste storage characterized by a relatively low Chemical oxygen demand (COD) and a low BOD5/COD with a low biodegradability and a high level of inorganic compound such as NH4+. During electro-coagulation treatment, a decrease in the chemical oxygen demand (COD) was shown with an increase in the current density. A toal of 33 and 56% COD removal were respectively obtained with 23 and 95 A m−2. However, nothing was observed concerning the removal of ammonium. Nevertheless, biological treatment with or without addition of activated sludge (AS) has allowed the decrease in ammonium with a yield of 62% after 166 h. However, with the addition of activated sludge, the efficiency of nitrification is increased by 10%. As the bioaugmentation with AS has not improved the removal of organic matters and that the electrochemical treatment is not appropriate for removing NH4+, coupling treatment such as EC-biotreatment was envisaged. An integrated process involving electro-coagulation as pre-treatment of biological treatment to treat mature leachate appeared therefore relevant in the tested conditions at 23 A m−2with a 15 and 98% global removal, respectively, of COD and NH4+.

AbstractThe pollution caused by discharges of oil drilling is now a source of environmental degradation and raises currently a particular interest. We propose in this work the application of electrocoagulation (EC) and electro-oxidation (EO) treatment for the leachate of these drilling muds. The effect of pH, current density, the electrolysis time, and the amount electrolytic added were studied, and the effectiveness of the processes is evaluated by measuring the chemical oxygen demand (COD). The dissolution is the best way to mobilize pollutants from drilling mud so we conducted leaching before starting the electrochemical treatment. The processes were carried out in batch mode using a stainless steel anode and ruthenium cathode for the EO and aluminum electrodes materials for the EC. The preliminary results clearly demonstrate the compatibility of the two techniques used with the type of pollution studied. In fact, the EC allowed the COD removal of about 95% and a rebate rates above 78% for EO.

The pollution caused by discharges of oil drilling is now a source of environmental degradation and raises currently a particular interest. We propose in this work the application of electrocoagulation (EC) and electro-oxidation (EO) treatment for the leachate of these drilling muds. The effect of pH, current density, the electrolysis time, and the amount electrolytic added were studied, and the effectiveness of the processes is evaluated by measuring the chemical oxygen demand (COD). The dissolution is the best way to mobilize pollutants from drilling mud so we conducted leaching before starting the electrochemical treatment. The processes were carried out in batch mode using a stainless steel anode and ruthenium cathode for the EO and aluminum electrodes materials for the EC. The preliminary results clearly demonstrate the compatibility of the two techniques used with the type of pollution studied. In fact, the EC allowed the COD removal of about 95% and a rebate rates above 78% for EO.

La communauté de communes de Bretagne Romantique souhaite depuis plusieurs années s’inscrire dans une dé marche de développement durable et ainsi devenir une collectivité à énergie positive. Après avoir réalisé plusieurs projets sur son territoire (projet éolien, chaufferie bois), elle s’intéresse à la métha ni sation et lance donc une première étude de faisabilité d’installation d’une telle unité sur son territoire.Une étude de gisement a alors été menée en contactant les principaux acteurs de production de biomasse, tels que les agriculteurs et les municipalités du territoire concerné, mais aussi les communes des territoires limitrophes. Pour la valorisation des produits issus de la méthanisation (chaleur, biogaz, digestat) une étude a été engagée en parallèle auprès des industriels et des communes du territoire Bretagne Romantique et limitrophes.Les résultats de l’étude ont conforté l’idée qu’un projet d’ampleur était réalisable sur le secteur d’autant plus que la hausse des tarifs d’obligation d’achat en mai 2011 et l’obtention d’une subvention dans le cas du plan de performance énergétique permettent d’envisager soit le développement d’un projet restreint à une dizaine d’exploitations agricoles en zones structurellement excédentaires (ZES), soit l’implantation d’un digesteur de plus grande puissance; mais la localisation reste à mieux définir en fonction de la zone de production des entrants et de valorisation de la chaleur.