Acid mine drainage （AMD） that releases highly acidic, sulfate and metals-rich drainage is a serious environmental problem in coal mining areas in China. In order to study the effect of using loess for preventing AMD...Acid mine drainage （AMD） that releases highly acidic, sulfate and metals-rich drainage is a serious environmental problem in coal mining areas in China. In order to study the effect of using loess for preventing AMD and controlling heavy metals contamination from coal waste, the column leaching tests were conducted. The results come from experiment data analyses show that the loess can effectively immobilize cadmium, copper, iron, lead and zinc in AMD from coal waste, increase pH value, and decrease Eh, EC, and 8024- concentrations of AMD from coal waste. The oxidation of sulfide in coal waste is prevented by addition of the loess, which favors the generation and adsorption of the alkalinity, the decrease of the population of Thiobacillusferrooxidans, the heavy metals immobilization by precipitation of sulfide and carbonate through biological sul- fate reduction inside the column, and the halt of the oxidation process of sulfide through iron coating on the surface of sulfide in coal waste. The loess can effectively prevent AMD and heavy metals contamination from coal waste in in-situ treatment systems.展开更多
In China, coal mine spoils have traditionally been dumped in cone-shaped heaps that have the potential to pollute air, soil and water environments. The coal waste pile occupies lots of arable land and endangers the ec...In China, coal mine spoils have traditionally been dumped in cone-shaped heaps that have the potential to pollute air, soil and water environments. The coal waste pile occupies lots of arable land and endangers the ecological system in the coal mine district. Vegetation restoration is an efficient approach for controlling the environment pollution of coal waste pile, and is also a topic of current interest in restoration ecology and degradation system ecology. This study focused on the distribu- tion pattern and limiting factors of vegetation in coal waste pile of Xinzhuangzi Coal Mine in Huainan. The results show that two stable plant communities （Synodon dactylon＋Erigeron bonariensis.L＋Setaria viridis community and Humulus scan- den＋Erigeron bonariensis. L community） exist at the bottom of the pile. Synodon dactylon and Erigeron bonariensis. L have much higher values of summed dominance ratio, which denote that these two species can be used for restoration of coal waste piles. The high levels of pH （8.77） and salinity, low levels of total P and total K in coal mine spoil can be the limiting factors for the residence and growth of vegetation.展开更多
基金Supported by the-National Natural Science Foundation of China （30671448） the Science and Technology Pillar Program of Hebei Province 12220802D）
文摘Acid mine drainage （AMD） that releases highly acidic, sulfate and metals-rich drainage is a serious environmental problem in coal mining areas in China. In order to study the effect of using loess for preventing AMD and controlling heavy metals contamination from coal waste, the column leaching tests were conducted. The results come from experiment data analyses show that the loess can effectively immobilize cadmium, copper, iron, lead and zinc in AMD from coal waste, increase pH value, and decrease Eh, EC, and 8024- concentrations of AMD from coal waste. The oxidation of sulfide in coal waste is prevented by addition of the loess, which favors the generation and adsorption of the alkalinity, the decrease of the population of Thiobacillusferrooxidans, the heavy metals immobilization by precipitation of sulfide and carbonate through biological sul- fate reduction inside the column, and the halt of the oxidation process of sulfide through iron coating on the surface of sulfide in coal waste. The loess can effectively prevent AMD and heavy metals contamination from coal waste in in-situ treatment systems.
文摘In China, coal mine spoils have traditionally been dumped in cone-shaped heaps that have the potential to pollute air, soil and water environments. The coal waste pile occupies lots of arable land and endangers the ecological system in the coal mine district. Vegetation restoration is an efficient approach for controlling the environment pollution of coal waste pile, and is also a topic of current interest in restoration ecology and degradation system ecology. This study focused on the distribu- tion pattern and limiting factors of vegetation in coal waste pile of Xinzhuangzi Coal Mine in Huainan. The results show that two stable plant communities （Synodon dactylon＋Erigeron bonariensis.L＋Setaria viridis community and Humulus scan- den＋Erigeron bonariensis. L community） exist at the bottom of the pile. Synodon dactylon and Erigeron bonariensis. L have much higher values of summed dominance ratio, which denote that these two species can be used for restoration of coal waste piles. The high levels of pH （8.77） and salinity, low levels of total P and total K in coal mine spoil can be the limiting factors for the residence and growth of vegetation.
