OP-II-3

PP-I-17PHOTOVOLTAIC SOLAR POWERED ELECTROCHEMICALOXIDATION (PSEO): KINETICS OF THE REMOVAL OF TOTALORGANIC CARBON FROM LIGNOSULPHONATE WASTE-WATERDominguez-Ramos A., Aldaco R., Irabien A.Department of Chemical Engineering and Inorganic Chemistry, University ofCantabria, Avda. Los Castros s/n 39005, Spain, domingueza@unican.esThe release limits of pollutants to water bodies are becoming more and morestringent as covered in the BREF documents regarding Best Available Technologies(BATs) for waste-water treatment in the European Union [1]. Electrochemicaloxidation using boron doped diamond electrodes could fulfill the technicalrequirements to remove any kind of organic dissolved species in liquid effluents [2],but nowadyas more R&D (and later innovation) is requested for futureimplementation. The limitations are due to two different issues: the current cost perelectrode unit area and the high specific energy consumption per unit of volumetreated [3]. The energy cunsumption is a serious handicap due to the additionalenvironmental loads due to the electrical consumption to generate the requestedcurrent density between electrodes. To prevent these environmental loads, a novelprocess called Photovoltaic Solar powered Electrochemical Oxidation wasdeveloped, in which the energy collected from a set of photovoltaic modules isdirectly inyected into an electrochemical reactor [4].Consequently, the kinetic rate r is based on the instanteneous solar irradiation g.Based on previous experimental results obtained at galvanostatic conditions using apower supply, a kinetic rate expression was proposed as a function of the appliedcurrent density i. A linear relationship between g and i was proposed to relate bothvariables, so finally it leads to Eq. 1:( g)i( g) Ck1i− r =Eq. 11+ k2Where k 1 and k 2 are parameters that integer photovoltaic module characteristicsand the kinetic values obtained under current controlled conditions; C represents theTotal Organic Carbon concentration. From Eq. 1, it is seen that under high irradiationconditions, the process becomes mass-transfer controlled and a first order kinetic isoberved. Only under very low irradiation conditions, the process is controlled by250