1 Technical University of Crete, School of Environmental Engineering, Design of Environmental Processes Laboratory, Akrotiri, 73100, Chania, Greece. Electronic address: petros.gikas@enveng.tuc.gr.
2 National Technical University of Athens, School of Civil Engineering, Sanitary Engineering Laboratory, Zographou Campus, 15773, Athens, Greece. Electronic address: smalamis@central.ntua.gr.
3 National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science & Technology, Zographou Campus, 15773, Athens, Greece. Electronic address: konmoust@central.ntua.gr.
4 University of Verona, Department of Biotechnology, 37134, Verona, Italy. Electronic address: david.bolzonella@univr.it.