A method for remediation of environments contaminated with halogenated organic compounds, in particular per- and polyfluoroalkyl substances, the method comprising the steps of placing a plurality of electrodes in the contaminated environment, applying an electric direct current between said electrodes, providing at least one electrically conductive reductant for halogenated organic compounds, obtaining information indicative of the electrical resistance between said electrodes, analyzing said information to detect whether at least one of said electrodes introduced a lower electric current into the contaminated environment compared to the remaining ones of said electrodes and bringing said reductant into or in close proximity to the contaminated environment in response to said detection such that the electrical resistance to the contaminated environment of at least one of said electrodes identified to introduce a lower electric current into the contaminated environment is decreased.

Apparatus and methods for a non-destructive recovery of PFAS contaminants from a variety of media, the apparatus including 1) a polarity conversion unit for non-destructive PFAS removal from soil, sludges, filter media, and objects; 2) a brine pot evaporator for recovering PFAS from foams and fluids; 3) a fluids treatment system for PFAS removal from treated fluids; and 4) an amphiphilic decontamination wand for PFAS removal from hard surfaces.

A stacked circulatable microbial electrochemical reactor and a degradation method of petroleum hydrocarbon contaminated soil are provided, which belong to the field of microbial electrochemical soil remediation. The stacked circulatable microbial electrochemical reactor of the present disclosure expands influence range of anodes by a stacked microbial electrochemical system, accelerates the movement of the petroleum hydrocarbon molecules in the contaminated soil by a water circulation system, and improves the mass transfer capacity of soil, thereby increasing the degradation efficiency of petroleum hydrocarbon in the contaminated soil with microbial electrochemical technology from different aspects. The degradation method of petroleum hydrocarbon contaminated soil is provided. The degradation method of the present disclosure is simple in operation and has a high degradation efficiency of petroleum hydrocarbon in contaminated soil.

A system for electrokinetic desalinization and enhanced chloride removal of a portion of soil includes at least one cathode; at least one anode; and a backfill around the cathode of a composition of a granular, conductive material and a backfill around the anode of a second composition comprising the granular, electrically conductive material and a calcium-containing material; an anode discharge line communicating with an interior of the anode; and a cathode discharge line communicating with the interior of the cathode tube. The presence of the calcium-containing material in the granular, electrically conductive material backfilling the anode enhances removal of chloride from the portion of soil.

An apparatus for remediation of a copper and nickel co-contaminated soil includes a housing. A crushing device is arranged at the upper part of the inside of the housing. A stirring device is arranged below the crushing device. An anode electrode and a cathode electrode are provided at both ends of the inner bottom of the housing, respectively. In the present invention, the soil contaminated by copper and nickel is first poured from the top of the crushing device, and then crushed thoroughly under the action of the crushing device. The crushed soil facilitates the movement of copper and nickel metal ions therein toward the electrodes under the action of the anode electrode and the cathode electrode, thereby achieving optimal soil remediation.

A method for extracting an elemental metal from agricultural waste including collecting a sample of the waste and performing an electrochemical extraction on the waste to producing a metal precipitate and a byproduct. The method further including collecting the metal precipitate and byproduct produced via the electrochemical extraction for further reaction, recycling, sale, or reuse.

An apparatus for remediation of a copper and nickel co-contaminated soil includes a housing. A crushing device is arranged at the upper part of the inside of the housing. A stirring device is arranged below the crushing device. An anode electrode and a cathode electrode are provided at both ends of the inner bottom of the housing, respectively. In the present invention, the soil contaminated by copper and nickel is first poured from the top of the crushing device, and then crushed thoroughly under the action of the crushing device. The crushed soil facilitates the movement of copper and nickel metal ions therein toward the electrodes under the action of the anode electrode and the cathode electrode, thereby achieving optimal soil remediation.

The present invention provides a remediation method for degradation of cadmium in soil. The specific steps are as follows: step 1, determining the content of cadmium in the soil; step 2, crushing and sieving soil from a soil surface, and weighing; step 3, wetting the soil, and removing part of cadmium in the soil to obtain semi-remediated soil; step 4, mixing the semi-remediated soil with a remediation agent, and allowing to stand to obtain improved soil; and step 5, planting Bidens pilosa in the improved soil, and when a growing season is finished, uprooting, and ashing to obtain finished soil. The present invention utilizes anode and cathodes and a remediation agent to treat the cadmium contaminated soil, and plants Bidens pilosa in the soil to achieve a joint effect of electrodynamic remediation, chemical remediation, microbial remediation and phytoremediation to remediate the cadmium contaminated soil.

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.