The oil,gas,and other products of in-situ pyrolysis of oil-rich coal can enter the underground environment through fracturing fractures formed by mining,resulting in a series of environmental behaviors.To further understand the natural degradation and volatilization of oil-rich coal pyrolysis products in the underground environment,silt was selected as a typical soil,and tar from oil-rich coal pyrolysis was taken as a typical pollutant.The natural degradation and volatilization behaviors of five components of coal tar in silt were studied,the kinetic models of the two environmental behaviors were established,and the effects of temperature,initial concentration of pollutants and other factors on natural degradation and volatilization were further investigated.The results indicated that:the order of degradation effect of each component of coal tar in silt was phenol oil＞washing oil＞naphthalene oil＞asphalt＞anthracene oil;The natural degradation of each component in silt accords with the first-order kinetic model.The degradation rate constant of phenolic oil was 6.18×10-3,and the half-life of anthracene oil was 228 d.When the temperature was 35 ℃,the degradation rate was 67％.And it was increased to 72％when the initial concentration of pollutants was 10 g·kg-1.The volatilization of coal tar in silt fitted with the Elovich equation,the volatilization rate of each component in silt was phenol oil＞naphthalene oil＞washing oil＞anthracene oil＞asphalt,in which the volatilization rate of phenol oil was four times than that of asphalt.The volatilization rate at 35 ℃ was 1.2～2.5 times that at 15 ℃,and the initial concentration of pollutants had no significant effect on the volatilization of coal tar components.The results of this study can provide reference for the control and remediation of groundwater environmental pollution caused by in-situ mining.
维普
万方数据
