Study On Pollution Characters And Migration Rules Of Heavy Metals On High-sulphur Coal Gangue Abandoned Land

Through the field investigation, laboratory experiment and simulation test, the paper selects the high-sulphur coal gangue abandoned land in Zhijin county in Guizhou province as the research object, and researches systematically the pollution characters and migration rules of the heavy metal elements such as Fe, Mn, Al, Cu, Pb, Zn, Cr, Cd, Hg, As and so on in high-sulphur coal gangue-soil-water-biological system. It has found that the average content of Cu exceeds the standard in the high-sulphur coal gangues, and the contents of Cu, Cd, Cr in soils around gangue piles exceed the national standard badly too. But the soil environmental background values of these elements in Guizhou are higher; the potential ecological risk of the farmland soil is only slight. Acidification is not only very serious in water on and around the abandoned coal gangue piles, but the concentration of Fe, Mn and Hg severely exceed the standard, so which the potential ecological harm risk is higher. Through the simulation test, the paper discusses thoroughly on the migration rules of the heavy metals in the high-sulphur gangues and farmland soil under the stress of acid rain and the acidic sewage with heavy metals in the abandoned pool. Through the seed germination tests and zebrafish embryonic acute toxicity tests, the effects of the high-sulphur gangue, polluted soil and surface water around the gangue piles to the growth and development of crop and aquatic biology are revealed.