Abstract: A mobile soil and sludge treatment apparatus and a method of treating soil and sludge useful in a soil washing process or a biological decontamination of soils and/or sludges. In one embodiment of the invention, a plurality of tanks are mounted on a vehicular trailer for over-the-road movement and each tank includes aerator/mixers and a plurality of peripherally arranged air jets with the mixing, aeration and air jets combining to prevent settling of the solids in the slurry during the decontamination process. In a second embodiment of the invention, a single large tank is mounted on a vehicular trailer with the tank including aerator/mixers and a slurry pump for recirculating the slurry throughout the tank with the recirculating pipes terminating in jet nozzles or eductors which enhance mixing and solids suspension. In a third embodiment, the aeration/mixing is obtained by a plurality of downwardly directed air jet nozzles adjacent the bottom of the tank.

Abstract: A mobile tank for decontamination of waste or ground water contains multiple cells for biological treatment and clarification of the water. Systems are provided for aerating the treatment cells and for recycling activated bacteria from the clarifier cell to the primary treatment cell.

Abstract: A method of decontaminating an impoundment in which waste-water and sludge from a pressure wood treating plant or other industry is stored by constructing a treatment unit in a portion of the lagoon or impoundment, pumping clean water into the treatment unit, adding the sludge to the treatment unit, adding a mixture of mutant bacteria, nutrients, and emulsifiers to the treatment unit, continuously aerating the mixture in the treatment unit, and analyzing samples taken from the treatment unit at regular intervals until the waster water and sludge are substantially free of detectable hazardous contituents.