Desorption Characteristics of Crude Oil in Oil-Contaminated Chernozem

Abstract

The desorption characteristics of the petroleum pollutants in oil-contaminated chernozem was researched in the process of exploring the interaction between crude oil pollutants and the typical soil in Daqing oilfield. The oscillation-equilibrium method was used in desorption experimental simulation. Desorption kinetics of petroleum pollutants, desorption effect of suspended particles concentration, and the influences of pH, temperature on adsorption action were investigated by the experiments. Results showed that the release velocity of petroleum pollutants was rapidly in the first few minutes, however the desorption process approached to balance gradually in 1-2 hours and attained balance completely after 3 hours. In addition, the balanced desorption capacity of the chernozem ascended gradually when desorption process achieved balance, with the increase of pH, concentration of suspended particles and temperature. The chernozem soil had weak desorptive ability to the crude oil pollutants in the Daqing oilfield.