1. Engineering Faculty, Department of Environmental Engineering, Atatürk University, Erzurum 25240, Turkey, Tel. ; Fax:
2. Department of Environmental Engineering, Gebze Technical University, Gebze Kocaeli 41400, Turkey
3. Engineering Faculty, Department of Chemical Engineering, Çankırı Karatekin University, Çankırı 18000, Turkey
4. School of Chemical Engineering and Advanced Materials, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
5. GAP Technologies Ltd., 1 Grosvenor Place, 8th Floor, London SW1X 7HJ, UK