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Effect of air pollution control devices on mercury isotopic fractionation in coal-fired power plants
Liu, Hongwei3; Diao, Xing1,2; Yu, Ben; Shi, Jianbo1,3; Liu, Qian; Yin, Yongguang; Hu, Ligang; Yuan, Chungang2; Jiang, Guibin3
2019-07-05
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume517Pages:1-6
AbstractCoal combustion is an important source of anthropogenic mercury (Hg) emissions. Air pollution control devices (APCDs) are widely used in coal-fired power plants (CFPPs) to reduce pollutant emissions including Hg. To gain insight into the Hg isotopic fractionation produced by APCDs, the Hg isotopic compositions of feed coal (FC) samples and combustion byproducts from 7 CFPP utility boilers in Hebei Province of China were studied. Significant mass-dependent fractionation (MDF) was observed in combustion byproducts when comparing with FC samples, while mass-independent fractionation (MIF) was not identified. Compared to FC samples, no significant difference in bottom ash (BA, delta Hg-202(BA-FC) = 0.08 +/- 0.16 parts per thousand, 1SD, n = 3) samples while light isotopes were enriched in fly ash (FA, delta Hg-202(FA-FC) = - 0.38 +/- 0.75 parts per thousand, 1SD, n = 7) samples. Boilers lacking of a selective catalytic reducer (SCR) unit produced gypsum (GY) samples with negative MDF signatures compared to FC samples (delta Hg-202(GY-FC), (no) (SCR) = -0.22 +/- 0.10 parts per thousand, 1SD, n = 3). In contrast, boilers equipped with a SCR unit produced GY samples with higher MDF signatures (delta Hg-202(GY-FC,SCR) = 0.54 +/- 0.40 parts per thousand, 1SD, n = 3), probably as a result of the oxidation of Hg-0 in the SCR unit. Calculated isotopic signatures of gaseous Hg in the stack emission (SE, delta Hg-202(SE)-(FC) = 0.03 +/- 0.20 parts per thousand, 1SD, n = 7) had no significant difference from that of FC samples. The results suggested distinct isotopic compositions should be fully considered during tracing Hg pollution via Hg isotopic signatures, especially when solid produced by CFPPs were involved.
Department环境化学与生态毒理学国家重点实验室
KeywordMercury isotopic fractionation Coal-fired power plant Air pollution control devices Coal combustion
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42531
Collection环境化学与生态毒理学国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
2.Jianghan Univ, Inst Environm & Hlth, Wuhan 430056, Hubei, Peoples R China
3.North China Elect Power Univ, Dept Environm Sci & Engn, Hebei Key Lab Power Plant Flue Gas Multipollutant, Baoding 071003, Peoples R China
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liu, Hongwei,Diao, Xing,Yu, Ben,et al. Effect of air pollution control devices on mercury isotopic fractionation in coal-fired power plants[J]. CHEMICAL GEOLOGY,2019,517:1-6.
APA Liu, Hongwei.,Diao, Xing.,Yu, Ben.,Shi, Jianbo.,Liu, Qian.,...&Jiang, Guibin.(2019).Effect of air pollution control devices on mercury isotopic fractionation in coal-fired power plants.CHEMICAL GEOLOGY,517,1-6.
MLA Liu, Hongwei,et al."Effect of air pollution control devices on mercury isotopic fractionation in coal-fired power plants".CHEMICAL GEOLOGY 517(2019):1-6.
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