摘要
由于飞灰的主要成分与粉煤灰、高炉矿渣等非常接近,用于沥青混凝土路面中具有良好的发展前景。但飞灰中含有的重金属等有害物质对路面周围的环境影响不容忽视。通过对飞灰沥青混凝土采用水槽浸出试验得到重金属的长期累积释放量,并构建出重金属渗入地下水的迁移扩散模型,对道路中重金属进入地下水进行环境风险评估,最后根据《生活饮用水卫生标准》(GB5749—2006)推算出沥青混凝土路面中重金属的有效量限值。结果表明:As、Cr的致癌风险值分别为2.26×10^(-10)、2.33×10^(-10),Zn、Cd、Hg的非致癌危害商分别为4.17×10^(-7)、2.43×10^(-7)、7.22×10^(-6),分别未超过风险表征限值10^(-6)与1;造粒飞灰沥青混凝土路面中Cr、Zn、As、Cd、Hg的有效量限值分别为25.46、279.83、1.10、12.19、0.07mg/kg。
Municipal solid waste incineration fly ash can be applied in the asphalt pavement widely,since the similar components of municipal solid waste incineration fly ash,coal fly ash and blast furnace slag.However,the environmental risk of heavy metals from fly ash should be paid more attention.The long term leaching tests for cumulative amounts of heavy metals were conducted by tank leaching tests.And the migration and diffusion models of heavy metal infiltration into groundwater were established.The environmental risk assessment of heavy metals for the groundwater was carried out.Last but not least,the maximum availability amount of heavy metals in the pavement were calculated by“Standard for drinking water quality”(GB 5749-2006).The results showed that the carcinogenic risk values of As(2.26×10^-10)and Cr(2.33×10^-10)were lower than 10^-6.Meanwhile,the hazards of Zn,Cd and Hg were 4.17×10^-7,2.43×10^-7 and 7.22×10^-6,respectively,which did not exceed risk limit 1.The maximum availability amount of Cr,Zn,As,Cd and Hg in the asphalt pavement were 25.46,279.83,1.10,12.19,0.07 mg/kg,respectively.
作者
张晶
杨玉飞
杨金忠
孙英杰
黄启飞
ZHANG Jing;YANG Yufei;YANG Jinzhong;SUN Yingjie;HUANG Qifei(Research Academy of Environmental Sciences,Beijing 100012;School of Environmental and Municipal Engineering,Qingdao Technological University,Qingdao Shandong 266033)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2019年第1期89-94,共6页
Environmental Pollution & Control
基金
国家重点研发计划重点专项(No.2016YEE0127800)
关键词
飞灰
沥青混凝土
路面利用
重金属
环境风险评估
fly ash
asphalt
utilization on pavement
heavy metals
environmental risk assessment
