燃煤烟气中汞排放对周边环境影响  

Effects of flue gas mercury emission from two coal-fired power plants in Shanghai on peripheral environment

作　　者：王晓浩[1] 王娟[1] 王文华[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《生态学杂志》2011年第5期928-932,共5页Chinese Journal of Ecology

基　　金：国家高科技研究发展计划项目(2007AA06Z340)资助

摘　　要：研究了上海市内2个燃煤电厂所排放烟气中的汞对周边环境的影响,并利用高架连续点源大气污染模型分析了电厂烟气排放汞对周边大气汞浓度的影响。结果表明,G电厂周边大气汞浓度范围为9.7~15.6 ng.m-3,J电厂为15.2~22.9 ng.m-3。利用高架连续点源大气污染模型,估算出G电厂和J电厂所排放的烟气下风向3 km处元素态汞的落地浓度分别为0.218和3.034 ng.m-3,颗粒态汞的落地浓度分别为0.038和1.199ng.m-3。G电厂周边表层土壤汞浓度为36.3~136.5 ng.g-1,J电厂为44.3~115.9ng.g-1。G电厂周边植物叶片中汞浓度为215.3~342.3 ng.g-1,J电厂为223.4~396.9ng.g-1。现场监测数据和模型估算均表明：燃煤电厂所排放的烟气对周边环境中汞的分布和积累有贡献。Samples of top soil and air around two coal-fired power plants in Shanghai were collected,and their mercury（Hg） concentrations were determined,aimed to study the effects of flue gas Hg emission from the power plants on their peripheral environment.An atmospheric dispersion model was used to predict the ground level concentration of Hg dispersed continuously down from the point source of high stack.The Hg concentrations in the air around power plants G and J were 9.7-15.6 ng·m-3 and 15.2-22.9 ng·m-3,the ground level concentrations of gaseous element Hg were 0.218 ng·m-3 and 3.034 ng·m-3,and the ground level concentrations of particulate Hg were 0.038 ng·m-3 and 1.199 ng·m-3,respectively.The Hg concentrations in the top soils around power plants G and J were 36.3-136.5 ng·g-1 and 44.3-115.9 ng·g-1,and the Hg concentrations in plant leaves were 215.3-342.3 ng·g-1 and 223.4-396.9 ng·g-1,respectively.Both the field monitoring and the model estimate showed that the flue gas emission from the coal-fired power plants contributed to the distribution and accumulation of Hg in the peripheral environment.

关 键 词：汞排放 燃煤电厂 环境影响 

分 类 号：X502[环境科学与工程—环境工程]