The pollution caused by the mining and smelting of heavy metals is becoming an increasingly severe environmental problem.In this study,the environmental risks of mine tailings were explored using typical antimony tail...The pollution caused by the mining and smelting of heavy metals is becoming an increasingly severe environmental problem.In this study,the environmental risks of mine tailings were explored using typical antimony tailings(the depth of the sample taken from the ground to the deepest position of 120 cm)from the Zuoxiguo mine in Yunnan Province,Southwest China.The tailings were examined to explore the geological background,distribution characteristics,and release characteristics of heavy metals.Additionally,stabilizer treatments for heavy metals were investigated in consideration of waste treatment.The results showed that the contents of Sb and As(8.93×103 and 425 mg/kg,respectively)in the tailings were considerably higher than the local soil background values,suggesting that these metals pose a considerable threat to the surrounding environment.The geological background values of Cr,Cd,Pb,Cu,and Zn were relatively low.The results of static release showed that Sb,As,Cd,and Cr leached from the tailings more easily than Cu,Zn,and Pb under acidic conditions(pH=2.98).Geo-accumulation indices and potential ecological risk indices showed that Sb,As,Cd,and Pb were highly enriched in the tailings,whereas Cu,Cr,and Zn contents were relatively low.The single factor ecological risk index of the mining area showed that Sb and As are high ecological risk factors,whereas Cr,Cu,Zn,Cd,and Pb are not.The results of the orthogonal test results showed that by adding 15.0%(m/m)fly ash and 15.0%(m/m)zeolite powder to the quicklime and curing for 28 d,a significant stabilization effect was observed for Sb,As,and Pb.This study helps determine the priority control components for characteristic heavy metals in antimony tailings,and provides valuable insights regarding the formulation of appropriate mitigation strategies.展开更多
生物质燃烧向大气中排放大量痕量气体和颗粒物,源排放清单是深入研究生物质燃烧环境气候效应的重要基础数据。利用全球火排放数据库GFED(Global Fire Emissions Database)、NCAR全球火排放清单FINN(Fire INventory from NCAR)和中国露...生物质燃烧向大气中排放大量痕量气体和颗粒物,源排放清单是深入研究生物质燃烧环境气候效应的重要基础数据。利用全球火排放数据库GFED(Global Fire Emissions Database)、NCAR全球火排放清单FINN(Fire INventory from NCAR)和中国露天生物质燃烧排放清单MEIC(Multi-resolution Emission Inventory for China),对2008~2017年中国地区生物质燃烧源排放的空间分布、季节和年际变化特征以及不同清单间的异同进行分析研究。3个清单都显示生物质燃烧释放的黑碳(BC)、有机碳(OC)、空气动力学粒径小于2.5μm的颗粒物(PM2.5)和一氧化碳(CO)在中国东北、长江和黄河下游之间地区和中国南方的排放量较高,与我国的主要农作物产地和森林地区分布一致。FINN清单排放量在华南地区与西南地区比其他两个清单高,而GFED清单排放量在长三角地区比其他两个清单排放量高。中国地区平均生物质燃烧排放量在春季出现峰值,而在不同的生物质燃烧地区峰值出现的季节不同,与各地农作物播种、收获时节和农耕习惯不同有关。2008~2017年,中国地区年平均生物质燃烧排放量的峰值主要出现在2014年,但各地区峰值出现的年份明显不同,东北、华中/东、华南和西南地区分别在2015年、2013年、2008年和2010年排放量达到最大。对于BC、OC和PM2.5,GFED和MEIC清单中的排放量比较接近,而FINN中的排放量是GFED和MEIC中的2~3倍;3个清单中CO的排放量比较接近。2014年生物质燃烧源排放与人为源排放的对比分析表明,所有物种中,生物质燃烧排放的OC和PM2.5相对于人为源排放量占比最大,3个清单中占比分别为9%~24%和5%~16%,说明生物质燃烧排放的OC和一次PM2.5是中国气溶胶的重要来源。展开更多
基金supported by the High-Level Talent Training Program in Guizhou Province(GCC[2023]045)the Guizhou Talent Base Project[RCJD2018-21]。
文摘The pollution caused by the mining and smelting of heavy metals is becoming an increasingly severe environmental problem.In this study,the environmental risks of mine tailings were explored using typical antimony tailings(the depth of the sample taken from the ground to the deepest position of 120 cm)from the Zuoxiguo mine in Yunnan Province,Southwest China.The tailings were examined to explore the geological background,distribution characteristics,and release characteristics of heavy metals.Additionally,stabilizer treatments for heavy metals were investigated in consideration of waste treatment.The results showed that the contents of Sb and As(8.93×103 and 425 mg/kg,respectively)in the tailings were considerably higher than the local soil background values,suggesting that these metals pose a considerable threat to the surrounding environment.The geological background values of Cr,Cd,Pb,Cu,and Zn were relatively low.The results of static release showed that Sb,As,Cd,and Cr leached from the tailings more easily than Cu,Zn,and Pb under acidic conditions(pH=2.98).Geo-accumulation indices and potential ecological risk indices showed that Sb,As,Cd,and Pb were highly enriched in the tailings,whereas Cu,Cr,and Zn contents were relatively low.The single factor ecological risk index of the mining area showed that Sb and As are high ecological risk factors,whereas Cr,Cu,Zn,Cd,and Pb are not.The results of the orthogonal test results showed that by adding 15.0%(m/m)fly ash and 15.0%(m/m)zeolite powder to the quicklime and curing for 28 d,a significant stabilization effect was observed for Sb,As,and Pb.This study helps determine the priority control components for characteristic heavy metals in antimony tailings,and provides valuable insights regarding the formulation of appropriate mitigation strategies.
文摘生物质燃烧向大气中排放大量痕量气体和颗粒物,源排放清单是深入研究生物质燃烧环境气候效应的重要基础数据。利用全球火排放数据库GFED(Global Fire Emissions Database)、NCAR全球火排放清单FINN(Fire INventory from NCAR)和中国露天生物质燃烧排放清单MEIC(Multi-resolution Emission Inventory for China),对2008~2017年中国地区生物质燃烧源排放的空间分布、季节和年际变化特征以及不同清单间的异同进行分析研究。3个清单都显示生物质燃烧释放的黑碳(BC)、有机碳(OC)、空气动力学粒径小于2.5μm的颗粒物(PM2.5)和一氧化碳(CO)在中国东北、长江和黄河下游之间地区和中国南方的排放量较高,与我国的主要农作物产地和森林地区分布一致。FINN清单排放量在华南地区与西南地区比其他两个清单高,而GFED清单排放量在长三角地区比其他两个清单排放量高。中国地区平均生物质燃烧排放量在春季出现峰值,而在不同的生物质燃烧地区峰值出现的季节不同,与各地农作物播种、收获时节和农耕习惯不同有关。2008~2017年,中国地区年平均生物质燃烧排放量的峰值主要出现在2014年,但各地区峰值出现的年份明显不同,东北、华中/东、华南和西南地区分别在2015年、2013年、2008年和2010年排放量达到最大。对于BC、OC和PM2.5,GFED和MEIC清单中的排放量比较接近,而FINN中的排放量是GFED和MEIC中的2~3倍;3个清单中CO的排放量比较接近。2014年生物质燃烧源排放与人为源排放的对比分析表明,所有物种中,生物质燃烧排放的OC和PM2.5相对于人为源排放量占比最大,3个清单中占比分别为9%~24%和5%~16%,说明生物质燃烧排放的OC和一次PM2.5是中国气溶胶的重要来源。
