• «Research project for the valorization of biogas at the landfill of “Pera Galinoi" (Heraklion, Crete)»,  Funded by: United Association of Solid Waste Management for Crete (ESDAK), 2015-2017, Scientific Coordinator: P. Gikas
  • «Investigation of a novel process for the treatment of landfill leachate»,  Funded by: PERTECH S.A., 2015 – 2017, Scientific Coordinator: P. Gikas
  • «Management Plan for the River Water Basin of Aegean Islands (GR14), with emphasis on point pollution sources», Funded by: Hellenic Special Secretariat for Water, Ministry of Environment and Energy, 2013-2015, Scientific Coordinator: P. Gikas
  • «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