Dr. Petros Gikas is Professor at the School of Chemical and Environmental Engineering, Technical University of Crete, Greece, and director of the “Design of Environmental Processes Laboratory”. His research interests are focused on municipal, industrial and agricultural waste and wastewater management. He is specifically active in the design of novel wastewater treatment processes with emphasis in low cost–low energy treatment processes and on water reclamation and reuse applications. He is also working on energy recovery from biosolids and solid wastes, utilizing thermal or biological processes. Dr. Gikas is the author of more than 70 scientific articles, while he has presented his research findings in more than 150 conferences. He serves as Associate Editor for the "Journal of Environmental Management", while he has served as Guest Editor for eight Special Issues.