Importance of the pH buffering capacity - comparison of various methods to estimate the pH properties of a waste material
- Royal Institute of Technology, Stockholm (Sweden)
The final pH of the leach water controls the leaching of many metals from MSWI ash in construction materials and landfills. The buffering properties of the ash determines the final pH of the leachate and is therefore one of the most important properties of a waste material. In this study three different methods to investigate the pH buffering capacity of ashes have been compared; two batch methods and one flow-through method. The results of this study showed that the MSWI bottom ash used here had a large buffering capacity in the pH region where the solubility of most pH-sensitive metals is lowest, around pH 8. The buffering reactions are slow. The duration of an experiment should therefore be about 50 days if all material should have time to react. A comparison of the results of the experiments showed that at least 50% of the buffering capacity in a batch system comes from dissolved constituents, that would not buffer in a flow-through system.
- Research Organization:
- Solid Waste Association of North America, Silver Spring, MD (United States); Air and Waste Management Association, Pittsburgh, PA (United States); Integrated Waste Services Association, Washington, DC (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States); American Society of Mechanical Engineers, Yonkers, NY (United States). Solid Waste Processing Div.; Environmental Protection Agency, Research Triangle Park, NC (United States). Air Pollution Technology Branch
- OSTI ID:
- 548962
- Report Number(s):
- CONF-970440-; ON: DE97007054; TRN: 97:005590-0050
- Resource Relation:
- Conference: 5. annual North American waste-to-energy conference and exhibition, Research Triangle Park, NC (United States), 22-25 Apr 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of fifth annual North American waste-to-energy conference; PB: 1102 p.
- Country of Publication:
- United States
- Language:
- English
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