Improved in-situ remediation systems which can be used to reclaim contaminated soils impacted by salts, heavy metals, and radionuclides by provision of multiple methods and devices for the contaminated soil remediation including electrokinetic method and devices, leaching solution supply and removal methods and devices, soil negative pressure moisture control method and devices, pressurized leaching/extraction method and devices, and sequential leaching/extraction methods and chemicals for the improvement of the remediation efficiency, enhancement of contaminants migration rates, shortening of remediation period, and prevention of secondary subsurface contamination.

Improved in-situ remediation systems which can be used to reclaim contaminated soils impacted by salts, heavy metals, and radionuclides by provision of multiple methods and devices for the contaminated soil remediation including electrokinetic method and devices, leaching solution supply and removal methods and devices, soil negative pressure moisture control method and devices, pressurized leaching/extraction method and devices, and sequential leaching/extraction methods and chemicals for the improvement of the remediation efficiency, enhancement of contaminants migration rates, shortening of remediation period, and prevention of secondary subsurface contamination.

Soil contamination by heavy metals constitutes an important environmental problem, whereas field applicability of existing remediation technologies has encountered numerous obstacles, such as long operation time, high chemical cost, large energy consumption, secondary pollution, and soil degradation. A design and demonstration of a method is provided which is based on asymmetrical alternating current electrochemistry (AACE) that achieves high degrees of contaminant removal for different heavy metals (Cu, Pb, Cd) at different initial concentrations (from 100 to 10,000 ppm), all reaching corresponding regulation levels for residential scenario after rational treatment time (from 30 min to 6 h). No excessive nutrient loss in treated soil was observed and no secondary toxic product was produced. Long-term experiment and plant assay showed the high sustainability of the method and its feasibility for agricultural use.

Soil contamination by heavy metals constitutes an important environmental problem, whereas field applicability of existing remediation technologies has encountered numerous obstacles, such as long operation time, high chemical cost, large energy consumption, secondary pollution, and soil degradation. A design and demonstration of a method is provided which is based on asymmetrical alternating current electrochemistry (AACE) that achieves high degrees of contaminant removal for different heavy metals (Cu, Pb, Cd) at different initial concentrations (from 100 to 10,000 ppm), all reaching corresponding regulation levels for residential scenario after rational treatment time (from 30 min to 6 h). No excessive nutrient loss in treated soil was observed and no secondary toxic product was produced. Long-term experiment and plant assay showed the high sustainability of the method and its feasibility for agricultural use.

A process for curbing of emissions of toxic metals and chelating agent from remediated soils, sediments and other substrates contaminated with toxic metals, said process comprising: (a) remediation of contaminated soil, sediment and other substrate with washing solution, said washing solution comprising EDTA or other chelating agent from the group of aminopolycarboxylic acids and their salts and mixtures thereof; (b) addition of 0.05-5% (w/w, dry weight) of zero-valent Fe or Fe compounds from the group of Fe-oxides and Fe-oxide-hydroxides into the slurry phase of soil, sediment and other substrate; (c) mixing of Fe-amended slurry; (d) separation of solid phase of remediated and Fe-amended soil, sediment and other substrate; (e) ageing of remediated and Fe-amended soil, sediment and other substrate for 0.5-45 days.

A process for curbing of emissions of toxic metals and chelating agent from remediated soils, sediments and other substrates contaminated with toxic metals, said process comprising: (a) remediation of contaminated soil, sediment and other substrate with washing solution, said washing solution comprising EDTA or other chelating agent from the group of aminopolycarboxylic acids and their salts and mixtures thereof; (b) addition of 0.05-5% (w/w, dry weight) of zero-valent Fe or Fe compounds from the group of Fe-oxides and Fe-oxide-hydroxides into the slurry phase of soil, sediment and other substrate; (c) mixing of Fe-amended slurry; (d) separation of solid phase of remediated and Fe-amended soil, sediment and other substrate; (e) ageing of remediated and Fe-amended soil, sediment and other substrate for 0.5-45 days.

The present invention is a system for treating land, either to reclaim or optimize the land. Embedded subsurface pipes deliver water to the land. The water may be loaded with soil-treating additives. As water streams from the pipes, it treats the land before passing into a drainage ditch around the periphery of the land. The water is removed from the ditch and recycled, removing contaminants (in reclamation operations) or adding more additives (in optimization operations), before returning to the pipes for another round of treatment, if necessary.

The present invention is a system for treating land, either to reclaim or optimize the land. Embedded subsurface pipes deliver water to the land. The water may be loaded with soil-treating additives. As water streams from the pipes, it treats the land before passing into a drainage ditch around the periphery of the land. The water is removed from the ditch and recycled, removing contaminants (in reclamation operations) or adding more additives (in optimization operations), before returning to the pipes for another round of treatment, if necessary.

The present subject matter illustrates a zero-valent metal suspension in non-aqueous phase. The suspension comprises 41 wt. % of a plurality of zero-valent iron particles; 0.1 wt % of a surfactant; 36 wt. % of an oil; and 23 wt. % of a thickening agent.

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-4883, Pseudomonas denitrificans VKPM-4884, Pseudomonas sp. longa. VKPM-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 ration, 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.