Anthropogenic mercury emissions in South Africa: Coal combustion in power plants
Anthropogenic mercury emissions in South Africa: Coal combustion in power plants
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DOI：
10.1016/j.atmosenv.2008.04.032
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发表时间：
2008-09-01
影响因子：
5
通讯作者：
Mason, Robert P.
中科院分区：
文献类型：
--
作者：
Dabrowski, James M.;Ashton, Peter J.;Mason, Robert P.
南非被认为是世界上汞 (Hg) 排放量第二高的国家。这一假设基于对主要来自金矿开采和煤炭燃烧的汞排放总量的估计。通过特别关注该国燃煤发电厂的煤炭燃烧来评估南非环境中汞的潜在来源。汞排放量估算基于所有发电厂每年燃烧的煤炭总量（112.3 Mt y(-1)）、南非煤炭的汞含量（0.2 ppm）以及每个发电厂使用的排放控制装置。结果表明，南非燃煤发电厂产生的汞排放量（范围在 2.6 至 17.6 吨 y(-1) 之间，估计平均排放量为 9.8 吨 y(-1)）明显低于文献建议的水平（约 50 吨 y(-1)）。计算得出的排放因子（范围为 0.02 至 0.16 克汞吨（-1）燃煤）和人均估算值（0.24 克汞人(-1) y(-1) R-1，其中 R 为燃煤发电总量的比例）落入其他国家报告的汞清单值范围内，表明本文提出的燃煤电厂汞排放估算比之前发布的更为可靠。 (C) 2008 Elsevier Ltd. 保留所有权利。
South Africa is regarded as a country with the 2nd highest mercury (Hg) emissions in the World. This assumption is based on estimates of total Hg emissions derived primarily from gold mining and coal combustion. The potential sources of Hg to the South African environment were assessed by focussing particularly on coal combustion at the country's coal-fired power plants. Mercury emission estimates were based on the total amount of coal burned in all power plants per year ( 112.3 Mt y(-1)), the Hg content Of South African coals (0.2 ppm) and the emission control devices used in each power plant. Results indicate that Hg emissions arising from South Africa's coal-fired power plants (ranging between 2.6 and 17.6 tonnes y(-1), with an estimated average emission of 9.8 tonnes y(-1)) are significantly lower than suggested in the literature (approximately 50 tonnes y(-1)). The calculated emission factor (ranging between 0.02 and 0.16 g Hg tonne(-1) coal burned) and per capita estimates (0.24 g Hg person(-1) y(-1) R-1, where R is the fraction of total electricity generated from coal) fall within the range of values reported for Hg inventories derived in other countries and indicate that Hg emission estimates for coal-fired power plants presented in this paper are more reliable than those published previously. (C) 2008 Elsevier Ltd. All rights reserved.