Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1999-04-08
2000-09-26
Bagnell, David
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
588900, 210619, 210767, 210768, 210669, B09B 100, G21F 900
Patent
active
061234834
ABSTRACT:
Soil and mud of any kind may be decontaminated of its hazardous substances and petroleum products. The materials are mixed with water for soil and mud washing in a wet-type mixing and grinding mill. The washed out material is separated from the eluate which carries away the pollutants extracted from the soil and mud. The cleaned material can be safely returned to nature. The contaminated eluate is exposed to sorption media, such as lignite (brown coal, wood coal) ground to a particle size of a few microns. The sorption media adsorb the pollutants in the eluate fully. After removing the (solid) sorbens from the (liquid) eluate, they can be disposed of or treated for recycling. The eluate, now practically free of hazardous substances, may be released into surface or ground water, or may be pumped back into the industrial water recirculation system. The apparatus includes a wet-type mill which is fed from a soil and mud staging area and from the water recirculation system. The mixture of soil and mud with the wash water undergoes dewatering in a belt filter press. The eluate is intimately mixed in the adsorber with sorption media. The sorption media with the adsorbed pollutants are separated from the eluate. The remaining volume (or mass, respectively) now amounting to less than 1.5% of the original volume (mass) of the soil and mud treated, can be deposited in hazardous waste dumps, or they may undergo further treatment for recycling of valuable elements.
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Bagnell David
Greenberg Laurence A.
Lerner Herbert L.
Pechhold Alexandra
Stemer Werner H.
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