Effect of Calcium in Field-Spent GACs on Pore Development During Regeneration

Autor:	Gerard Dagois, Vernon L. Snoeyink, Ramon G. Lee, Fred S. Cannon, James R. DeWolfe
Rok vydání:	1993
Předmět:	Thermal oxidation Granular activated carbon Waste management chemistry.chemical_element General Chemistry Microporous material Calcium Adsorption chemistry Chemical engineering Volume (thermodynamics) medicine Water treatment Water Science and Technology Activated carbon medicine.drug
Zdroj:	Journal - American Water Works Association. 85:76-89
ISSN:	0003-150X
DOI:	10.1002/j.1551-8833.1993.tb05959.x
Popis:	Thermal regenerations were conducted on a granular activated carbon (GAC) that had become exhausted (spent) in a water treatment plant where it had been in service nearly four years. This GAC contained 2 percent calcium. With this field-loaded calcium intact, proper regeneration restored the spent GAC to the same pore structure and surface area that was exhibited by several virgin GACs. When calcium appeared inside the spent GAC, it always caused micropores to be converted to small mesopores during thermal oxidation. In contrast, if the calcium was leached out of the spent GAC with acid, thermal oxidation increased only the micropore volume
Databáze:	OpenAIRE
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