NDLI: Immobilization of B, F, Cr, and As in alkaline coal fly ash through an aging process with water

Content Provider	Springer Nature Link
Author	Ogawa, Yasumasa Sakakibara, Kento Wang, Li Suto, Koichi Iue, Chihiro
Copyright Year	2014
Abstract	Fourteen different alkaline coal fly ashes (CFAs) were used for the experiment, in which each sample was mixed with water to be 28.6 % of water content (wt/wt) and aged for 1–4 weeks at 10–30 °C. This simple treatment is advantageous for decreases in water-soluble B, F, Cr, and As. Compared to non-aged CFAs, their water-soluble fractions remained 0.56–88 %, 21–85 %, 0.37–93 % and 2.6–88 %, respectively, after aging for a week at 20 °C, although the amounts of Cr and As released from some CFA samples increased. Considering the significant decrease in elution of sulfate, Ca and Al after aging, the immobilization, namely prevention of toxic element elution, could be related to formation of secondary minerals such as portlandite, gypsum and ettringite. Immobilization of B and Cr tends to proceed preferentially under colder conditions. Aging at higher temperatures enhances the leachability of Cr in some CFA samples. Contrary to the behavior of B and Cr, water-soluble F effectively decreases under warmer conditions.
Starting Page	6757
Ending Page	6770
Page Count	14
File Format	PDF
ISSN	01676369
Journal	Environmental Monitoring and Assessment
Volume Number	186
Issue Number	10
e-ISSN	15732959
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-07-10
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coal fly ash Toxic elements Leaching Immobilization Environmental Monitoring/Analysis Environmental Management Ecotoxicology Atmospheric Protection/Air Quality Control/Air Pollution Ecology
Content Type	Text
Resource Type	Article
Subject	Pollution Medicine Management, Monitoring, Policy and Law

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