A system, process and method for remediating contaminated soil and solvent recovery. A solvent mixture including a polar and a non-polar solvent is mixed with contaminated soil in mixing vessels, allowing the solvent mixture to extract contaminates from the soil. The solvent mixture is separated from the soil using bicanting units to form a solvent stream and a soil stream. The soil stream goes through air sparging in a dryer to remove residual solvent vapor. Water and/or micro-fines are extracted from the solvent stream using a centrifuge. The solvent stream undergoes distillation in a distillation unit to remove the containments from the solvent stream, while recovering separately the solvent mixture and a product. The recovered solvent mixture can be recycled back to the mixing vessels. The contaminates can be BTEX or F1-F4 hydrocarbons, and the product can be oil or other hydrocarbons. The system can be mobile.

The invention disclosed herein includes apparatus and a method for collecting leachate and storing it to provide ballast on top of landfill covers at a landfill. A control berm is built on top of the exposed landfill cover forming a barrier for ponding leachate. Leachate is collected from the waste interred at the landfill through known leachate collection system methods and apparatus and transported for deposit on the top surface of a landfill cover thereby resulting in the impoundment and ponding of the leachate on top of the landfill cover and providing ballast to keep the landfill cover in place and minimizing, if not preventing, wind uplift or shearing of the cover.

The invention disclosed herein includes apparatus and a method for collecting leachate and storing it to provide ballast on top of landfill covers at a landfill. A control berm is built on top of the exposed landfill cover forming a barrier for ponding leachate. Leachate is collected from the waste interred at the landfill through known leachate collection system methods and apparatus and transported for deposit on the top surface of a landfill cover thereby resulting in the impoundment and ponding of the leachate on top of the landfill cover and providing ballast to keep the landfill cover in place and minimizing, if not preventing, wind uplift or shearing of the cover.

The invention relates to agriculture and can be used to restore soil fertility. A method for remediation of contaminated lands involves pouring and introducing a bioreagent to a depth into the soil prepared for purification. Remediation is carried out in 2 steps: in the first step, slit-like or round holes are made in the infected area to a depth of 25 cm, poured with water, afterwards, 5-6 hours later, this area is poured with a bioreagent in the form of a humus-containing suspension in an amount of up to 400 g per kg of soil containing strains: Acinetobacter calcoaceticus VKPM V-4883, Pseudomonas denitrificans VKPM-4884, Pseudomonas sp. “longa” VKPM V-4885, Rhodococcus erythropolis in an amount of (6-8).Math.10.sup.9, (3-4).Math.10.sup.9 (2-3).Math.10.sup.9, (1-2).Math.10.sup.9 cells per 1 L of solution, respectively, in the ratio, wt. % 4.8:2.4:1.7:1.0. In the second step, 8-10 days later, half the initial dose of the concentrate of the humus-containing suspension is introduced. After introduction of the second reduced dose of the humus-containing suspension, watering is continued for 14 days. The distance between the slit-like or round holes is 8-10 cm. The proposed method for remediation of contaminated lands provides for treatment efficiency and a reduction in the degree of decontamination from a high degree of contamination to the MPC (maximum permissible concentration) level, preservation of soil biocenosis and restoration of soil fertility.

The invention relates to agriculture and can be used to restore soil fertility. A method for remediation of contaminated lands involves pouring and introducing a bioreagent to a depth into the soil prepared for purification. Remediation is carried out in 2 steps: in the first step, slit-like or round holes are made in the infected area to a depth of 25 cm, poured with water, afterwards, 5-6 hours later, this area is poured with a bioreagent in the form of a humus-containing suspension in an amount of up to 400 g per kg of soil containing strains: Acinetobacter calcoaceticus VKPM V-4883, Pseudomonas denitrificans VKPM-4884, Pseudomonas sp. “longa” VKPM V-4885, Rhodococcus erythropolis in an amount of (6-8).Math.10.sup.9, (3-4).Math.10.sup.9 (2-3).Math.10.sup.9, (1-2).Math.10.sup.9 cells per 1 L of solution, respectively, in the ratio, wt. % 4.8:2.4:1.7:1.0. In the second step, 8-10 days later, half the initial dose of the concentrate of the humus-containing suspension is introduced. After introduction of the second reduced dose of the humus-containing suspension, watering is continued for 14 days. The distance between the slit-like or round holes is 8-10 cm. The proposed method for remediation of contaminated lands provides for treatment efficiency and a reduction in the degree of decontamination from a high degree of contamination to the MPC (maximum permissible concentration) level, preservation of soil biocenosis and restoration of soil fertility.

A subsurface soil purification method includes a first process of injecting a cleaning liquid, that separates a contaminant in subsurface soil from the subsurface soil and that has been warmed to a higher temperature than a groundwater temperature, into an injection well provided in the ground, and a second process of pumping up groundwater containing the cleaning liquid, in which the contaminant separated from the subsurface soil has been dissolved, from a pumping well that is provided in the ground so as to be spaced apart from the injection well.

A subsurface soil purification method includes a first process of injecting a cleaning liquid, that separates a contaminant in subsurface soil from the subsurface soil and that has been warmed to a higher temperature than a groundwater temperature, into an injection well provided in the ground, and a second process of pumping up groundwater containing the cleaning liquid, in which the contaminant separated from the subsurface soil has been dissolved, from a pumping well that is provided in the ground so as to be spaced apart from the injection well.

A system, process and method for remediating contaminated soil and solvent recovery. A solvent mixture including a polar and a non-polar solvent is mixed with contaminated soil in mixing vessels, allowing the solvent mixture to extract contaminates from the soil. The solvent mixture is separated from the soil using bicanting units to form a solvent stream and a soil stream. The soil stream goes through air sparging in a dryer to remove residual solvent vapor. Water and/or micro-fines are extracted from the solvent stream using a centrifuge. The solvent stream undergoes distillation in a distillation unit to remove the containments from the solvent stream, while recovering separately the solvent mixture and a product. The recovered solvent mixture can be recycled back to the mixing vessels. The contaminates can be BTEX or F1-F4 hydrocarbons, and the product can be oil or other hydrocarbons. The system can be mobile.

A system, process and method for remediating contaminated soil and solvent recovery. A solvent mixture including a polar and a non-polar solvent is mixed with contaminated soil in mixing vessels, allowing the solvent mixture to extract contaminates from the soil. The solvent mixture is separated from the soil using bicanting units to form a solvent stream and a soil stream. The soil stream goes through air sparging in a dryer to remove residual solvent vapor. Water and/or micro-fines are extracted from the solvent stream using a centrifuge. The solvent stream undergoes distillation in a distillation unit to remove the containments from the solvent stream, while recovering separately the solvent mixture and a product. The recovered solvent mixture can be recycled back to the mixing vessels. The contaminates can be BTEX or F1-F4 hydrocarbons, and the product can be oil or other hydrocarbons. The system can be mobile.

A system is disclosed for remediation of contaminated earth from hazardous substances, comprising mobile equipment that are generally available. The mobile equipment are physically separate and temporarily organised at a location in the proximity of a contaminated site when the need arises and are dispersed or disposed of following remediation of the contaminated site. The generally available mobile equipment may include earth moving excavators, truck mixers equipped with tumblers used for mixing and delivering cement-concrete to the construction site, and centrifuges.