• 责任者：Wei Linhong (School of Jinling ; Nanjing University ; Nanjing 210089 ; China) ; Ye Nianjun
• 刊名：Geological Journal of China Universities
• 出版年：2013
• 卷期：19(4)
• 关键词：粉煤灰 ; powdered coal ashes ; 地下水污染 ; groundwater pollution
• 页码：p.683-691
• 图表：4 illus., 5 tables, 25 refs.
• 分类号：1800
• issnNo：ISSN1006-7493
• isbnNo：CN32-1440/P

     There are abundant coals in China. The majority of thermal power plants utilize coal as major fuel for producing electric power. Coal fly ash as a by-product of consuming coal usually stored in an open-air yard. The leaching of fly ash brings the toxic elements such as heavy metals and radioactive elements into the groundwater and is potential source for the water environment pollution. Water samples were collected from the groundwater and surface water body surrounding a thermal power plant located in Huaibei, Anhui Province. Moreover, the fly ash in the storage yard was sampled. The analysis including the element and mineral composition for coal fly ash, and the ICP-AES and hydrochemically analysis for water samples was carried out, as well as the leaching experiments. The results show that the concentration of NO3-, Cr6＋, Se in 12 groundwater samples around fly ash landfill are above water quality standard IlI set in quality standard for ground water. Contamination from Se is the heaviest among them and its concentration is 6.6 times higher than that in water quality standard HI. Further analysis of groundwater samples using principal component analysis combined with hierarchical cluster analysis method show that hydrochemical constituents of groundwater come from three sources： the first is natural water, accounting for 53.32%; the second is the water from sink areas slightly polluted by human activities, accounting for 17.37%; the third source represents fly ash leachatd, accounting for 14.96%. Hierarchical cluster analysis further identifies the spatial distribution of groundwater polluted by coal fly ash landfill： contamination is heavier where close to the coal fly ash landfill and shallow groundwater depth. Principal component analysis combined with hierarchical cluster analysis is an efficient method for investigating the effects of coal fly ash landfill on groundwater and identifying the origin of coal fly ash polluting groundwater.