Lysimeter washing of MSW incinerator bottom ash |
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| Institution: | 1. Wastewater Technology Centre, P.O. Box 5068, Burlington, Ontario, L7R 4L7, Canada;2. Laboratorium für Isotopentechnik, Kernforschungszentrum Karlsruhe, Germany;3. Department of Civil Engineering, McMaster University, Hamilton, Ontario, L8S4L7, Canada;1. ZEuUS, THM University of Applied Sciences, Wiesenstr. 14, 35390 Gießen, Germany;2. Department MNI, THM University of Applied Sciences, Wiesenstr. 14, 35390 Gießen, Germany;3. Soil Geography/Soil Science, Department of Geosciences, University of Cologne, Albertus-Magnus-Platz, 50923 Cologne, Germany;1. School of Civil Engineering and Construction, Anhui University of Science and Technology, Huainan 232001, Anhui, China;2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 21116, Jiangsu, China;3. JiangSu Collaborative Innovation Center for Building Energy Saving and Construction Technology, Xuzhou 21116, Jiangsu, China;1. Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA;2. Department of Natural Sciences, Voorhees College, P.O. Box 678, Denmark, SC 29042, USA;1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;2. Energy Research Institute, Interdisciplinary Graduate School, Nanyang Technological University, Singapore 637141, Singapore;1. Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UK;2. Centre for Advanced Structural Ceramics and Department of Materials, Imperial College London, London SW7 2AZ, UK;3. Earth Engineering Centre, Columbia University, New York, NY 10027, USA;1. School of Civil and Environmental Engineering, Nanyang Technological University, 639798 Singapore, Singapore;2. Nanyang Environment & Water Research Institute, Nanyang Technological University, 639798 Singapore, Singapore;3. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;4. Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland |
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| Abstract: | Stockpiled municipal waste incinerator bottom ash is frequently considered for utilization as a construction material. Two 360 kg lysimeter experiments were conducted to study percolation washing of contaminants from stockpiled MSW bottom ash. One lysimeter was leached with a concentrated sodium hydroxide solution, as a possible pre-treatment for improvement of the bottom ash characteristics prior to utilization, while the other was leached using distilled water. The lysimeter leachate was analysed, and at the end of the 2-year leaching period, the bottom ash from each lysimeter was subjected to several laboratory tests to assess the effect of the treatments. The laboratory tests showed that distilled water leachability of both treated ashes was an order of magnitude lower than that of fresh ash, but long-term contaminant leachability under acidic conditions had not changed. Although alkaline washing clearly resulted in greater contaminant removal than did distilled water washing, the chemical properties of the alkaline-leached bottom ash were not significantly different from those of the water-leached ash. |
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