Stirring Desorption Research And Application Of Oil Contaminants In Porous Media

With the rapid development of petrochemical industry, inevitably makes the soil absorbed a lot of petroleum pollutants. These petroleum pollutants adsorbed on porous medium without adequately addressing will not only cause a waste of oil resources, but also cause serious harm to the ecological environment and personal safety. In recent years, researchers has made some progress in desorption studies of oily soil and sludge oil pollutants. It reach for the removal of oil in porous media pollutants by conducting hydrothermal stripping. It is of great social significant and economic benefits.Subject based on the turbulent shear stress field effected on particles. The shear forces introduced into the sbuject strengthening porous media water thermal desorption process of petroleum pollutants removal. To simulate shear flow in a stirred tank, we designed four different impeller types, and analyzed the flow characteristics of a stirred tank. The turbulent kinetic energy and turbulence intensity of four different types of stirring blades exhibits symmetrical, and six straight blade disc turbine impeller can form two sizes up and down swirl. It can form a better double loop flow discharge cycle characteristics than the other to paddle type; four kinds of paddle stirred tank have the maximum shear stress distribution in the basic height z= 0, can make the different positions on the surface of the particles is strong effected by fluid shear stress.We chose porous activated carbon particles and activated alumina ball for the study by the shear stress. We research particle properties of porous media combined with micro-CT, SEM and its effect on the desorption of oil pollutant test, and conduct experimental research on the optimal hydrothermal stirred desorption operating conditions. The research shows that oil pollutants are well removed. The stuy concluded that hot water temperature of 90 ℃, stirring speed of 300r/min, liquid-solid ratio of 75:1, stirring time of 15min, surfactant concentration of lg/L and aeration of 1m3/h in the best stirred desorption conditions. It can provide the basis for an enlarged stirring and mixing cyclone integration equipment design.