Characterization and leaching toxicities of mercury in flue gas desulfurization gypsum from coal-fired power plants in China
Characterization and leaching toxicities of mercury in flue gas desulfurization gypsum from coal-fired power plants in China
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中国燃煤电厂烟气脱硫石膏中汞的表征及浸出毒性
DOI：
10.1016/j.fuel.2016.02.091
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发表时间：
2016-08-01
期刊：
影响因子：
7.4
通讯作者：
Qian, Guanren
中科院分区：
文献类型：
--
作者：
Hao, Ying;Wu, Simiao;Qian, Guanren
烟气脱硫 (FGD) 石膏样品采集自中国 20 个省份的 70 家发电厂。测定了样品中汞的总浓度、化学形态和汞的浸出毒性。总汞浓度范围从不可检测（ND）到4330μg/kg，平均值为891μg/kg，中位数为629μg/kg。 FGD样品中Hg浓度具有明显的区域特征。中国中部省份脱硫石膏中汞平均浓度高于其他省份。采用选择性序贯萃取（SSE）进行化学形态分析表明，水溶性和人胃酸溶性（F1+F2）的百分比范围为ND至总汞的25.2%，强复合汞（F4）是主要的化学形态，在大多数样品中占总汞的60%以上。此外，毒性特征浸出程序（TCLP）和合成沉淀浸出程序（SPLP）测试的浸出汞浓度均低于浸出毒性规定水平。从 TCLP 和 SPLP 中浸出的汞的平均百分比约为总汞的 3%，表明 FGD 石膏中的汞迁移率有限。 FGD 石膏中汞的潜在浸出量约为每年 0.65 吨。 (C) 2016 Elsevier Ltd. 保留所有权利。
Flue gas desulphurization (FGD) gypsum samples were collected from 70 power plants in 20 provinces in China. The total Hg concentration, chemical speciation and leaching toxicity of Hg in the samples were determined. The total Hg concentrations ranged from not detectable (ND) to 4330 mu g/kg with an average of 891 mu g/kg and a median of 629 mu g/kg. The Hg concentrations in the FGD samples had obvious regional characteristics. Provinces in the central part of China had higher average Hg concentrations in the FGD gypsum than other provinces. Selective sequential extraction (SSE) used for chemical speciation analysis showed that water soluble and human stomach acid soluble (F1 + F2) percentages ranged from ND to 25.2% of the total Hg, and strong complex Hg (F4) was the dominant chemical species, which accounted for more than 60% of the total Hg in most samples. Moreover, the leaching Hg concentrations from Toxicity Characteristic Leaching Procedure (TCLP) and Synthetic Precipitation Leaching Procedure (SPLP) tests were all below the regulation level of leaching toxicity. The average percentage of leaching Hg from TCLP and SPLP was approximately 3% of the total Hg, indicating limited Hg mobility in FGD gypsum. The Hg potential leaching from FGD gypsum was approximately 0.65 tons per year. (C) 2016 Elsevier Ltd. All rights reserved.