The 4KET4Reuse project has as mission to contribute with new technologies for the elimination of ECs of effluents of WWTP in the space SUDOE:
- Bioelectrogenesis: is a new process by which certain bacteria can oxidize organic matter and directly transfer the generated electrons to a solid conductive surface such as graphite. In this way you can get and store clean energy. The bioelectrogenic wetland is where these new technologies integrate into natural treatment systems, reducing up to 10% the volume of required wetlands. Its good performance predicts a high efficiency in removing ECs, an aspect that will be evaluated in 4KET4Reuse project.
- Filtration in modified clay (nano-composites): sand filtration, sand-anthracite or granular activated carbon (GAC) is a very extended operation in water treatment plants. The use of GAC presents, however, as a disadvantage a poor resolution in the elimination of small polar molecules (ECs). Thus, the development of composites based on advanced materials, will allow to improve the efficiency of the filtration treatment, through the reduction and / or elimination of ECs.
- Photocatalysis: Irradiation with ultraviolet light (UV-C) is very efficient for the disinfection of waste water, although in some cases it is necessary to have a previous stage of filtration with sand. A UV-C technology does not require the use of chemical compounds for the disinfection and limitation of a generation of disinfection products (DBPs). To eliminate ECs it is necessary to add an oxidant such as hydrogen peroxide or persulfate (UV-C / persulfate). Persulfate gives better results than hydrogen peroxide because its quantum yield at 254 nm is higher thus generating more sulfate radicals. Nonetheless, to reach a commercial product, it remains an R&D effort under analysis for the elimination of a higher content of grease contaminants.
- Electrokinetic process: these processes allow the elimination of contaminants under the influence of an electric field of low intensity, promoted between electrodes of opposite charge. Typology: electro osmosis, electromigration, electrophoresis and electrodialysis. At the laboratory scale, the process is effective to reduce the concentration of organic contaminants in matrices such as nanofiltration concentrate (WWTP) and effluent from wastewater treatment plants (PPCPs) in a short period of time (hours). For this, cells with different configurations (e.g. number of compartments, type of electrodes, position of the matrix in the cell) are used to promote the degradation of the compounds by oxidation and / or reduction. It is necessary to deepen the existence of intermediates or degradation products to help define optimal operating parameters and thus promote the mineralization of the emerging contaminants.