«Investigation of microscreen performance on various industrial and municipal wastewater treatment systems»,Funded by: Pyxis Water Systems, Inc., California, USA, 2013 – 2014, Scientific Coordinator: P. Gikas
«Potential for water reuse at Skiathos», Funded by: Municipal Water and Sewerage Company of Skiathos, 2011 – 2012, Scientific Coordinator: P. Gikas
«Technical Consulting for the project: Water Reuse in Kamari, Thira (Santorini)», Funded by: Municipal Water and sewerage Company of Thira, 2011 – 2013, Scientific Coordinator: P. Gikas
«Anaerobic oxidation of ammonia in municipal wastewaters»,Funded by: Special Account of Research Funds - TUC, 2011 – 2012, Scientific Coordinator: P. Gikas
«Potential for water reuse at Kamari, Santorini», Funded by: Municipal Water and Sewerage Company of Thira, 2009 – 2011, Scientific Coordinator: P. Gikas
«Investigation of the Anammox process in pretreated municipal wastewater», Funded by: Micro Media Filtration, Inc., California, USA, 2009 – 2010, Scientific Coordinator: P. Gikas
«Potential for water reuse at Paroikia, Paros», Funded by: Municipal Water and Sewerage Company of Paros, 2009 – 2011, Scientific Coordinator: P. Gikas
«Estimation of the average water consumption by the Greek households, during the pre-laundry process», Funded by: Procter and Gamble Hellas Ltd., 2008 – 2010, Scientific Coordinator: P. Gikas