| 摘要 |
A mobile apparatus and method for treating contaminated soil is disclosed. The apparatus consists of three interconnected subunits, namely a fluidized bed reactor for segregating an aqueous soil slurry based on particle size; a metals extraction unit for removing heavy metals and other contaminants from the contaminated soil fraction; and a water treatment system utilizing a high density sludge process to remove metals from the contaminated aqueous phase. The fluidized bed reactor includes a relatively small mixing chamber and a relatively large settling chamber which are partially separated by a baffle. Pressurized gas and foaming agent are dispersed into the mixing chamber to segregate the soil particles into a first fraction containing relatively small, contaminated soil particles and a second fraction containing relatively large, uncontaminated soil particles. The first fraction is continuously withdrawn from an upper portion of the reactor as a foam and a soil slurry containing the relatively uncontaminated second fraction is continuously withdrawn from a lower portion of the reactor. The soil slurry is dewatered by means of a hydrocyclone and a solids trap. Water, foaming agent and any suspended fines are recycled to the reactor vessel. |
