Dr. Arindam Sinharoy Dr. Sinharoy is currently working as postdoctoral researcher in the Department of Microbiology and Ryan Institute at National University of Ireland Galway. His current research work focuses on biological removal of chalcogen compounds (sulfur, selenium and tellurium) from wastewater and their recovery as nanoparticles either in their elemental form or as metal chalcogenide particles. Prior to joining NUIG, he completed his Ph.D on biological conversion of carbon monoxide for bioenergy and environmental applications at the Indian Institute of Technology Guwahati, India. He has authored and co-authored over 20 peer-reviewed journal publications, book chapters and currently editing two books. His areas of research expertise include bioenergy, syngas fermentation, bioprocess development for waste to energy and value added products, biokinetics of pollutant removal, heavy metal removal, chalcogen removal and their bioconversion.   Prof. Piet N.L. Lens  Prof.Dr.ir. Lens is established professor of New Energy Technologies at National University Ireland Galway. He is also Professor Environmental Biotechnology at UNESCO-IHE (Delft, the Netherlands), adjunct professor at Tampere University of Technology (Finland) and was previously on the faculty of the Sub-Department of Environmental Technology at Wageningen University (1999-2006), where he still has a zero nomination. Prof. Lens trained in Environmental Sanitation, then obtained his Ph.D. in Environmental Engineering at University Gent (Belgium). He is founding Editor-in-Chief of the Review Journal “Re/Views in Environmental Science and Bio/Technology” and founding editor of the IWA Publishing series “Integrated Environmental Technology”. Besides innovative research, he is also a leader in education and capacity-building, initiating several joint MSc and PhD degree programmes and organising numerous study-days, conferences, summer schools and short courses. He has (co-)authored over 550 scientific publications and edited 12 book volumes. His awards include the IWA Publishing Award (2002), a Marie Curie Excellence Grant (2004), nomination as IWA fellow (2010) and IWA Distinguished fellow (2015) and nomination as IBA fellow (2019). His research focuses on biofilms, sulfur biotechnology, metal speciation, bioavailability and removal, natural treatment systems, anaerobic wastewater and waste gas treatment for resource recovery and reuse.