Die Festwoche der Abfallwirtschaft und Altlasten der TU Dresden: 26.-30. September 2005 1. Fachtagung “Perspektiven von Deponien – Stilllegung und Nachnutzung nach 2005” am 26.-27. September 2005 2. Mischen oder Trennen ? –Grenzen der Technik und Nachweisführung nach ElektroG und VerpackV” am 28.September 2005 3. Festakt zur 10-Jahres-Feier (29.September 2005) Altlasten-rechtlicher Rahmen und regionale Praxis (30. September 2005) Co-Composting Solid Wastes and Sludges of City İZMİR Akin Alten and Ertugrul ERDİN Dokuz Eylül Üniversitesi Mühendislik Fakültesi Çevre Mühendisliği Bölümü 35160 Buca-İZMİR TÜRKEİ ertugrul.erdin@deu.edu.tr ; akin.alten@deu.edu.tr Summary Composting is a biological treatment method widely used for solid wastes and sewage sludges. In this study, co-composting of solid waste and sludges originating from Izmir city was investigated. In experimental part of the study, 12 reactors were set up in the laboratory. Reactors were loaded with solid waste taken from Uzundere composting plant and sludges taken from Cigli and Guneybati wastewater treatment plants. Solid wastes and sludges were mixed in different ratios. Experimental studies were carried out in three series. In Series 1, solid wastes taken from Uzundere composting plant were mixed with sludges taken from Cigli wastewater treatment plant. In Series 1, up to 22% of weight loss was gained in 42 days. Initial temperature of composting material was about 19.5 ºC and 24 hours later,