Effects of Poisonous and Harmful Elements Brought about by Coal Mining on Water Environment in Zibo Coal Mine, Shandong Province, China

Coal resources are very abundant in Zibo, Shandong Province, China. A lot of mining sewages are discharged during the coal mining. The mining sewage is characterized by highǑ (SO₄^2-), hardness and totally dissolved solids (TDS). Mining sewage in the southern Zibo is acidic, where heavy metals and benzene are detected. The Xiaofu River is polluted when mining sewage flows into it, so that the Mengshan Reservoir is polluted by Xiaofu River. The groundwater is polluted in Zichuan by the leaking of the Xiaofu River. The polluted Xiaofu River is thus used to irrigate the farmland in Mashang-Mengshui zone. The irrigation water affects the quality of shallow groundwater. The laboratory soil column test shows that SO₄^2-, Cl^-, Ca²⁺ and Mg²⁺ can migrate through vadose soil, especially SO₄^2- and Cl^-. KEY WORDSa mining sewage, surface water pollution, groundwater pollution.