Prof. Marcin Zieliński is a professor of Environment Engineering at the Institute of Engineering and Environmental Protection, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn. He got his Ph.D. in Environmental Science from the Warsaw Univerity of Technology, Poland. His research interests are mainly focused on finding technological solutions to improve the efficiency of water and wastewater treatment processes, sewage sludge management and bioenergy, in particular technologies for biogas production, production and energy use of microalgae biomass.