Speciation of Cr and its leachability in coal by-products from spanish coal combustion plants.
This study evaluates the behaviour of total Cr and Cr (VI) during coal combustion in two Spanish power stations. The content and distribution of Cr in the feed coal and combustion wastes was determined and the Cr contents were normalized using enrichment factor indexes. The speciation of Cr in the fly ash fractions from the different hoppers of the electrostatic precipitators was established and the possibility that the Cr (VI) might lixiviate when ashes are disposed of at landfill sites was assessed. Differences in the distribution and behavior of Cr in the two power stations were observed. According to European directive 1999/31/CEE, soluble Cr(VI) in the fly ashes studied would be unlikely to pose an environmental or health risk when the ash is disposed of.
López-Antón
M Antonia
MA
Instituto Nacional del Carbón (INCAR), CSIC, C/ Francisco Pintado Fe, no 26, Oviedo 33011, Spain.
Díaz-Somoano
Mercedes
M
Cuesta
Aida Fuente
AF
Riesco
Aida Rubio
AR
Martínez-Tarazona
M Rosa
MR
D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D003031:Coal; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000191:economics / Q000517:prevention & control; D017745:Incineration; D007220:Industrial Waste; D011210:Power Plants; D012995:Solubility; D013030:Spain; D018505:Waste Management
D003031:Coal; D007220:Industrial Waste; D002857:Chromium