Particle-Size Effects on the Volatilization of Oil in Porous Media

The volatilization process of oil with uniform size media as underlying material was studied. The weight loss of oil was determined by subtracting the columns’ pre and post weight measured on an electronic balance. The results show that the gasoline in porous media volatilizes at a logarithmic rate with respect to time, and the diesel oil in porous media volatilizes at a rate which can be best modelled as a square root of time. The volatilization coefficient of gasoline increases with the increment of particle size, and it of diesel oil decreases with increment of particle size. Binomial equation and power equation can describe the relationships of gasoline and diesel oil volatilization coefficients with mean grain size respectively.

Studies on the Volatilization of Oil in Soils under Natural Conditions

Oil-contaminated pillars were prepared by spilling oil on soils’ surface. The weight loss of oil was determined by subtracting the pillars’ pre and post weight measured on an electronic balance. The aim of this paper was to investigate the change of oil’s volatilization mass in soils with time. The results show that the gasoline in soils volatilizes at a logarithmic rate with respect to time, and the diesel oil in soils volatilizes at a rate which can be best modelled as a linear of time. The volatilization coefficient of gasoline in grit exceeds that in loam, while the volatilization coefficient of diesel oil in loam is from 2.0 to 2.5 times higher than that in grit. Oils’ volatilization coefficients increase with the increase of oil content. Linear equation and binomial equation describe the relationships of gasoline’s and diesel oil’s volatilization coefficients with oil content respectively.

Determination of Volatilization Coefficients of Trihalomethanes from Waters

The volatilization rates of trihalomethanes (CHCl3, CHBrCl2, CHBr2Cl, and CHBr3) were measured under various mixing conditions concurrently with those of oxygen and water. The volatilization coefficients of trihalomethanes were determined from their volatilization rates as the ratios of mass-transfer coefficients in respective liquid and gas phases between trihalomethanes and oxygen or water by new and conventional methods. The new method was indicated to be effective for the determination of the volatilization coefficient of a chemical with dimensionless Henry's constant lower than about 0.1. The volatilization coefficients of trihalomethanes obtained can be applied for estimating their volatilization rates under the conditions in which either the water-or gas-film resistances dominate or both film resistances are significant.