Geochemical and mineralogical evaluation of toxic contaminants mobility in weathered coal fly ash : as a case study, Tutuka dumpsite, South Africa

• Main Author: Akinyemi, Segun Ajayi.
• Format: Others
• Language: English
• Published: 2011
• Subjects: Coal fly ash; Dry disposed fly ash; Weathering/ageing; Unsaturated weathered ash; Mineral phases; Bulk chemistry; Pore water chemistry; Insoluble mineral phase; Dissolved soluble salts; Acid susceptibility; Soluble buffering constituents; Amphoteric behaviour; Modified sequential extraction scheme; Chemical partitioning; Metals mobility; Major oxides; Major elements; Trace elements; Anion species.
• Online Access: http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_6004_1325666445

The current study therefore aims to provide a comprehensive characterisation of weathered dry disposed ash cores, to reveal mobility patterns of chemical species as a function of depth and age of ash, with a view to assessing the potential environmental impacts. Fifty-nine samples were taken from 3 drilled cores obtained respectively from the 1 year, 8 year and 20-year-old sections of sequentially dumped, weathered, dry disposed ash in an ash dump site at Tutuka - a South African coal burning power station.