Research on the natural attenuation of vadose zone polluted by diesel

Abstract:

To quantitatively study the adsorption,biodegradation and volatilization of diesel polluted vadose zone environment during natural attenuation process,adsorption experiments were conducted to determine the adsorption equilibrium time of fine sand and clay vs saturated solution of diesel,which were 24 h,and the theoretical maximum adsorption capacity of the total petroleum hydrocarbons(TPH) of fine sand and clay were 234 and 430 mg·kg-1 respectively.The comparative experiments including six columns established the biodegradation and volatilization decay kinetic equations of fine sand polluted by diesel,ρ(TPH)=25.48e-0.002 7xand ρ(TPH)=25.48e-0.022 1x,and the equations of clay,ρ(TPH)=25.48e-0.005 1xand ρ(TPH)=25.48e-0.010 9x.The results showed that natural attenuation efficiency of clay polluted by diesel was greater than that of fine sand.