Biochemical removal of HAP precursors from coal. Quarterly technical report, October 1, 1996--December 31, 1996
This fifth quarterly report covers the period of October through December of 1996. Results are presented of pyrite and HAP precursor removal from Kentucky No. 9 coal in shake flasks and from Indiana No. 5 coal in columns. With Kentucky coal, rates of pyrite oxidation were about 6% per day, and significant As, Co, Cd, Mn, and Ni were removed from the coal. These same five HAP precursors also were significantly removed from Indiana No. 5 coal. Additionally, test results are presented of pyrite and HAP precursor removal from Indiana No. 5 and Pittsburgh No. 8 coal using high initial concentrations of ferric ions. These tests showed faster depyritization of coal than in previous tests done with low initial ferric ion concentrations. In addition, faster and more extensive removal of Cd, Co, Mn, and Ni from Indiana No. 5 coal occurred under high ferric conditions. High solution ferric ion concentration are expected in any biodepyritization process due to progressive biooxidation of pyrite to ferric sulfate. Ferric ions are probably the primary oxidant of pyrite and many of the HAP precursors in coal. Analysis of HAP precursors in Stockton Coal, used by PETC in HAP precursor combustion-mass balance test, was done and compared to PETC analytical data. The INEL slurry column reactor was operated in several shake down runs to prepare for complete HAP precursor removal-mass balance tests. Good separation of coal from ash-forming minerals was observed in these tests.
- Research Organization:
- Little Bear Labs., Inc., Red Lodge, MT (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- AC22-95PC95155
- OSTI ID:
- 506167
- Report Number(s):
- DOE/PC/95155--T5; ON: DE97052858
- Country of Publication:
- United States
- Language:
- English
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