Mobility of organic carbon from incineration residues |
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| Authors: | Ecke Holger Svensson Malin |
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| Institution: | 1. Division of Waste Science and Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden;2. International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, A-2340 Laxenburg, Austria;1. Magnel Laboratory for Concrete Research, Ghent University, Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium;2. Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281 – S3, 9000 Ghent, Belgium;1. S.A. Sagrex N.V., Heidelberg Cement Benelux, Heidelberg Cement Group, Terhulpsesteenweg 185, B-1170 Brussels, Belgium;2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium;3. Sol gel Centre for Research on inorganic Powder and Thin films Synthesis (SCRiPTS), Department of Inorganic and Physical Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281-S3, B-9000 Ghent, Belgium;1. Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou 730000, Gansu, China;2. Key Laboratory of Western China''s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Tianshui South Road 222, Lanzhou 730000, Gansu, China |
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| Abstract: | Dissolved organic carbon (DOC) may affect the transport of pollutants from incineration residues when landfilled or used in geotechnical construction. The leaching of dissolved organic carbon (DOC) from municipal solid waste incineration (MSWI) bottom ash and air pollution control residue (APC) from the incineration of waste wood was investigated. Factors affecting the mobility of DOC were studied in a reduced 2(6-1) experimental design. Controlled factors were treatment with ultrasonic radiation, full carbonation (addition of CO2 until the pH was stable for 2.5h), liquid-to-solid (L/S) ratio, pH, leaching temperature and time. Full carbonation, pH and the L/S ratio were the main factors controlling the mobility of DOC in the bottom ash. Approximately 60 weight-% of the total organic carbon (TOC) in the bottom ash was available for leaching in aqueous solutions. The L/S ratio and pH mainly controlled the mobilization of DOC from the APC residue. About 93 weight-% of TOC in the APC residue was, however, not mobilized at all, which might be due to a high content of elemental carbon. Using the European standard EN 13 137 for determination of total organic carbon (TOC) in MSWI residues is inappropriate. The results might be biased due to elemental carbon. It is recommended to develop a TOC method distinguishing between organic and elemental carbon. |
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