Open AccessBiochemical removal of HAP precursors from coal. Quarterly technical progress report, 1996
Publication year - 1996
Language(s) - English
Resource type - Reports
DOI - 10.2172/436489
Subject(s) - pyrite , ferric , coal , chemistry , slurry , sulfate , coal slurry , ferric ion , fly ash , coal combustion products , combustion , inorganic chemistry , environmental chemistry , nuclear chemistry , mineralogy , waste management , environmental engineering , organic chemistry , environmental science , engineering
Shake flask tests were completed of microbial pyrite and HAP precursor removal from Rosebud subbituminous coal. Significant amounts of Ni, F, Mn, Cd, Co and Be were removed from this coal. Analyses in connection with leach column tests of Pittsburgh coal were completed and confirmed significant removal of Ni, F, Mn, Cd, Co and As from this coal. Although Hg was not removed from Pittsburgh coal by microbial attack, there was a correlation between HCl leaching of Hg from this coal and the extent of depyritization. Since HgS is soluble in HCl, the results suggest HgS is exposed by chemical and microbial dissolution of coal pyrite. Column tests with cleaned Indiana No. 5 coal are in progress and show significant early dissolution of Ni, Mn, Cd, Co and As. A final shake flask test with Kentucky No. 9 coal was begun. Pittsburgh coal with a low content of fines was shipped to the Idaho National Engineering Laboratory (INEL) in preparation for slurry column tests of HAP precursor removal. Project results were presented at the PETC contractor`s conference held in Pittsburgh. A project progress review meeting was also held with the PETC technical project monitor