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.
Daqing oilfield; oil-contaminated soil; alkaline soil; multi-plant system; phytoremediation Abstract: Daqing oil-contaminated alkaline soil and high concentrations oil-pollutant samples were mixed at the ratio of 4:1, 2:1, 1:1 and 1:2 (vsoil/voil), respectively. Then the oil content of the mixed samples were detected and analyzed after phytoremediation experiment with multi-plant systems. The research results showed that Salsola collina Pall-Chinese wildrye-Thistle Herb-Medicago-Artemisia ordosica multi-plant system had a good degradation effect on oily-pollutants. During the 105-day experiment, the degradation rate of oil-pollutants could be up to 80.5% in the mixed soil (4:1, vsoil/voil). During the whole experiment, removal rate of total petroleum hydrocarbons (TPHs) could raise up 65.5% in the Coronilla varia-Lolium perenne-Amaranthus hypochondriacus multi-plant system mixed soil (2:1, vsoil/voil). Experimental results proved that the degradation effect on TPHs could be improved by the multi-plant systems and they could be reasonably matched to cure and restore the ecological environment of oil-contaminated soils.
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