Investigation Of Organic Pollution Impact On Groundwater During Mine-filling Process With Gangues

Based on the overview of recent research practice of gangues, by simulating the late stage of water saturation and early stage of leaching by upper plate water during the mine-filling process with gangues, which come from the 12th mine of Pingdingshan Coal Company Group and Yanma mine in Jiaozuo city, through soaking and leaching experiments respectively, this paper aims to determine the impacts of gangues to groundwater during the mine-filling process. The eluviation characteristics of 12 target index including pH, COD, BOD5, DO, permanganate index, ammonium nitrogen, nitrate nitrogen, total nitrogen, total phosphorus, volatile phenol, PAH and PCBs were examined. The results indicate that besides a high amount of total nitrogen which is considered to be the main pollution index. DO,pH, overall organic index, nitrate nitrogen, PAH and PCBs are also on a considerable level, which were determined by multivariate statistical analysis.Meanwhile, nonparametric test and factorial analysis of multivariate statistics methodology were employed to analyze experimental results by using SPSS13.0. Considering the actual experimental results, conventional organic index such as pH, COD, BOD5, DO, permanganate index, nitrate nitrogen, total nitrogen, ammonium nitrogen, total phosphorus together with the specific organic index such as PAH (Naphthalene, Acenaphthene, Fluorene, Phenanthrene, Anthracene) and PCBs (PCB28, PCB52, PCB118, PCB153) were used as target variables for analyzing. The analytical data indicate that total nitrogen and pH are selected as main factors; the values of conventional organic index are all under the standards; the impact of eluviation water from sample D, which has a small grain size, is relatively high; the overall impact related to conventional organic index of Yanma mine is higher than that of 12th mine in Pingdingshan; PAH (Naphthalene, Acenaphthene, Fluorene, Phenanthrene, Anthracene) and PCBs (PCB28, PCB52, PCB118, PCB153) are important pollutants; the impacts of PAH and PCBs from the above two different sites are on the same level.