摘要
为揭示燃煤电厂大气污染物排放对周边水环境的影响,以典型燃煤电厂为研究对象,分析了2008~2020年电厂大气污染物(烟尘、SO_(2)、NO_(x)、NH_(3)和颗粒物重金属)及电厂周边典型水库的水质,并估算了电厂大气污染物排放与水库水质的相关性及其对水库水体中硫化物、氮氧化物和重金属的贡献。结果显示,2008~2020年电厂烟尘、SO_(2)、NO_(x)和重金属(Hg、Cu、Zn、As、Cd、Cr和Pb)的排放量整体呈下降趋势,2015~2020年NH_(3)的排放量呈波动状态;2008~2020年黄壁庄水库入口和中心处的水质均达到《地表水环境质量标准》(GB 3838-2002)Ⅱ类水质标准以上,水库入口和中心处水体中的重金属含量与电厂烟尘重金属排放量呈显著相关。CALPUFF模型结果显示,该燃煤电厂排放的SO_(2)、SO_(4)^(2-)、NO_(x)、HNO_(3)、NH_(3)、Hg、As、Cd、Cr、Cu、Pb、Zn沉降到黄壁庄水库水面进入水中转化生成的水污染物SO_(4)^(2-)、HNO_(3)、NH_(3)-N、Hg、As、Cd、Cr^(6+)、Cu、Pb和Zn贡献浓度分别为3.35×10^(-3)mg/L、5.86×10^(-3)mg/L、5.88×10^(-4)mg/L、3.73×10^(-7)mg/L、1.32×10^(-5)mg/L、7.46×10^(10)mg/L、7.56×10^(-7)mg/L、2.16×10^(-7)mg/L、9.48×10^(-8)mg/L和8.66×10^(-6)mg/L,各项污染物的占标率的大小排序为Hg>NH_(3)-N>HNO_(3)>As>Cr^(6+)>SO_(4)^(2-)>Pb>Zn>Cu>Cd。
To reveal the impact of atmospheric pollutant emissions from coalfired power plants on the sur-rounding water environment,a typical coal-fired power plant was used as a research object to analyze the atmospheric pollutants(soot,SO_(2),NO_(x),NH_(3)and heavy metals in particulate matter)of the power plant and the water quality of typical reservoirs around the power plant from 2008 to 2020.The correlation between atmospheric pollutant emissions from power plants and reservoir water quality and their contributions to sulfide,nitrogen oxide,and heavy metals in reservoir waterbodies were estimated.The results showed that the emissions of soot,SO_(2),NO_(x)and heavy metals(Hg,Cu,Zn,As,Cd,Cr and Pb)from the power plant showed an overall decreasing trend from 2008 to 2020,while the emissions of NH_(3)fluctuated from 2015 to 2020.From 2008 to 2020,the water quality at the entrance and centre of the reservoir all met the Environmental Quality Standard for Surface Water(GB3838-2002).The heavy metal contents in the water at the entrance and centre of the reservoir were significantly correlated with the heavy metal emissions from the power plant.The results of CALPUFF model showed that water pollutants SO_(4)^(2-),HNO_(3),NH_(3)-N,Hg,As,Cd,Cr^(6+),Cu,Pb,and Zn,which were transformed by SO_(2),SO_(4)^(2-),NO_(x),HNO_(3),NH_(3),Hg,As,Cd,Cr,Cu,Pb,Zn deposited into the water surface of the reservoir from the power plant,contributed to the concentration of 3.35×10^(-3)mg/L,5.86×10^(-3)mg/L,5.88×10^(-4)mg/L,3.73×10^(-7)mg/L,1.32×10^(-5)mg/L,7.46×10^(10)mg/L,7.56×10^(-7)mg/L,2.16×10^(-7)mg/L,9.48×10^(-8)mg/L,8.66×10^(-6)mg/L,respectively.The order of proportion of various pollutants to standard was Hg>NH_(3)-N>HNO_(3)>As>Cr^(6+)>SO_(4)^(2-)>Pb>Zn>Cu>Cd.
作者
蔡春霞
贾晓丹
鲍国臣
曹竞心
黄博雅
王忠臣
CAI Chunxia;JIA Xiaodan;BAO Guochen;CAO Jingxin;HUANG Boya;WANG Zhongchen(Beijing Guohuan Environmental Technology Co.Ltd,Beijing 100012,China;Xi’an Center of China Geological Survey/Northwest China Center for Geoscience Innovation,Xi’an 710119,Shaanxi,China)
出处
《西北地质》
CSCD
北大核心
2024年第1期64-72,共9页
Northwestern Geology
关键词
燃煤电厂
大气污染物
重金属元素
污染贡献
coal-fired power plant
atmospheric pollutant
heavy metal element
pollution contribution
