LEACHING BEHAVIOR AND BIOAVAILABILITY OF ARSENIC AND SELENIUM IN FLY ASH FROM COAL-FIRED POWER PLANTS

被引：0
|
作者：
Yuan, Chun-Gang [1 ]
Yin, Lian-Qing [1 ]
Liu, Song-Tao [1 ]
He, Bin [2 ]
机构：
[1] N China Elect Power Univ, Sch Environm Sci & Engn, Baoding 071003, Hebei Province, Peoples R China
[2] Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
来源：
FRESENIUS ENVIRONMENTAL BULLETIN | 2010年 / 19卷 / 02期
基金：
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词：
fly ash; arsenic and selenium; leaching; sequential extraction; bioavailability; SEQUENTIAL EXTRACTION; HEAVY-METALS; SPECIATION; SEDIMENTS; CHINA;
D O I：
暂无
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A huge amount of fly ash was always produced by coal-fired power plants every year. Arsenic and selenium were absorbed and accumulated in fly ash during the combustion process of coal, but would be released into the environment again when/if fly ash was disposed. To better understand the mobility and bioavailability of arsenic and selenium in fly ash, one sequential extraction procedure was applied to characterize the species of As and Se. Both in fly ash were divided into 5 fractions: water extractable fraction (F1), acid soluble fraction (F2), reducible fraction (F3), oxidable fraction (F4) and residual fraction (F5). The fly ash samples from both the conventional pulverized coal (PC) and the circulating fluidized bed (CFB) combustor were analyzed. The results demonstrated that 71-84% of As and about 96% of Se were present in the extractable fractions (F1+F2+F3+F4) indicating that both in fly ash from coal-fired power plants have high mobility and bioavailability.
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页码：221 / 225
页数：5
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