Abstract
To develop a data base for the planning of effective flue gas desulphurization (FGD) by-product management, a laboratory study was undertaken to evaluate the following FGD material characteristics: (a) chemical and mineralogical composition; (b) leaching behavior and evolution of leachate chemistry with time; (c) nature and extent of geochemical interactions between FGD leachate and clay liner materials. The FGD by-product materials used in the study were produced as part of the limestone/hydrate lime sorbent injection process evaluation test runs at one of Ontario Hydro's coal-fired thermal generating stations. The major constituents of the waste material are free lime, anhydrite, calcite, and quartz, with minor amounts of magnetite and mullite. The presence of unreacted free lime imparts strong exothermic properties to this material. Leaching tests indicate that the waste material is highly alkaline but nonhazardous under the environmental protection act of the Ontario government. Modeling of leachate/clay liner interactions indicates that calcareous tills may serve as suitable liner materials at an FGD waste disposal site, where high leachate alkalinity is maintained. However, in the event of the leachate alkalinity being neutralized by CO 2(g) or other processes with a corresponding drop in pH, most rock-forming minerals and clay minerals may be usede as liner materials.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
