Advanced oxidation technologies for the treatment of effluents from doormanufacturing factories: Fid-Bau Portal

Advanced oxidation technologies for the treatment of effluents from doormanufacturing factories

Rodrigo, M.A. / Ganizares, P. / Jimenez, C. / Beteta, A. / Saez, C. / Rodriguez, L.

In this work, the treatment of wastewaters coming from wooden door-manufacturing plants has been studied using several technologies. To do this, the raw effluents of these factories have been treated by the combination of different technologies: conventional treatments (physicochemical and biological processes) and Advanced Oxidation Processes (AOPs) such as conductive-diamond electrochemical oxidation, ozonation process at alkaline pH and Fenton oxidation. It has been demonstrated that coagulation is a very effective technology for the treatment of colloids suspensions. Hence, the high concentration of colloids in the effluent of the doormanufacturing factories turns physicochemical technology into a good choice for the pretreatment of these wastewaters. The biological oxidation can achieve good removals of COD but in every case they are just in the typical limit for the discharge to municipal sewers. However, it is clear that the biological treatment is not enough to assure the complete treatment and a refining technology should be added to the treatment process. In this context, two bench-scale AOPs operated in batch mode (conductive-diamond electrochemical oxidation and ozonation process at alkaline pH) have been used in order to increase the biodegradability of the effluents and to check their possible recycle to the biological treatment. In addition, in case of incidents in the biological process, the three AOPs can treat successfully the effluents of the coagulation process. The time course of the main significant parameters obtained with these three technologies have been studied and results have been compared in terms of removal efficiency and of economy.