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.

The present invention relates to a potential difference-based diversion electrode arrangement and field intensity compensation method, comprising the following steps: the arrangement positions of paired diversion electrodes are determined according to the difference of potential around a position of field intensity to be compensated and the direction of an electric field line, and the paired diversion electrodes are inserted; and the field intensity enhancement rate of the position of field intensity to be compensated and the compensated field intensity value are calculated according to the difference of potential and arrangement positions of the paired diversion electrodes. In the present invention, the paired diversion electrodes are arranged in the direction of the electric field line by using the spatial difference of potential in the electric field, and the compensation of local field intensity is implemented, thereby beneficial to improving the overall efficiency of electrokinetic remediation for organic contaminated soil, and reducing the spatial difference of remediation efficiency.

A method in sand/water remediation by using photocatalytic fuel cell is related to the sewage treatment and sand/soil remediation field. The characteristic photocatalytic fuel cell uses photons or solar energy to produce highly active electron/holes is introduced to degrade pollutants. In the constructed visible light photocatalytic fuel cell, there is overlying water above polluted sands in a tubular reactor. Allowing static adsorption equilibrium to buildup, in the built photocatalytic fuel cell, the photocatalytic anode and photoelectric catalytic cathode are connected by wires with an external resistance. Using 50 W halogen lamp as the light source, it maintains photocatalysis and electro-catalytic reactions to degrade pollutants in the method. By degrading the pollutants in the overlying water, the pollutants in the sand are also desorbed and degraded, and rapidly decreased to a very low level. Thus in this method water purification treatment and sand remediation take place simultaneously.

Sintered Wave Multi-Media Polarity Conversion Treatment Apparatus and Process is disclosed, which uses a non-destructive physiochemical PFAS vapor emissions treatment system to provide vacuum and vapor conveyance for 1) a Polarity Conversion Unit for non-destructive PFAS removal from soil, sludges, rechargeable galvanic filter media and objects, 2) a fluids treatment line for PFAS removal from water, brines, foams and colloids, and 3) an amphiphilic decontamination wand for PFAS removal from hard surfaces. The vapor emissions treatment system uses direct spray cooling to cool treatment gases where fluid chemistry causes pre-micellular aggregates/liquids crystals formation. Filtered aggregates are dried in a Brine Pot Evaporator for off-site disposal. Residual PFAS vapors are removed through a Vapor Phase Galvanic Separator where galvanic currents offer high energy interfaces of varying charges for monomeric PFAS self-assembly. The Polarity Conversion Unit assembly uses transportable flow through vessels, static geometry, high surface area, treatment gas temperature and velocity modulation to reduce thermal resistivity of the media. Treatment gas is sequentially routed around shaped vertical media beds where thermal energy disorganizes surface polarities (Gibbs free energy) disconnecting amphiphilic compounds/mixtures from the media. The fluids treatment line uses a Surface Excess Concentrator where a surface excess complex is created, removed and dried for off-site disposal. Treated bulk fluids exit from the bottom (below the surface) and are routed to the Aqueous Phase Galvanic Separator. Galvanic filter media is recharged in the Polarity Conversion Unit for reuse. Hard surfaces are decontaminated using the amphiphilic decontamination wand to disorganize surface polarity. Catalytic oxidation and granular activated carbon systems are also used to capture, destroy and measure classic contaminants and cleaved hydrocarbons from fluorinated precursors during treatment.

Apparatus and method are provided for remediating trichloroethylene-polluting soils by integrated rotated migration and PRB. The apparatus includes a device of electrokinetic remediation, a PRB and a device of injection of surface active agents. The main components of the device of electrokinetic remediation and PRB include cathode, anode, electrode chamber and PRB. A liquid injection pipe is installed between various electrodes and PRBs. The operation of each device is controlled by each control system. The disclosure integrated rotated migration and PRB for remediating contaminants. Surface active agents is helpful for dispersing TCE from soil. The arrangement of the electrode and the PRB greatly shortens distances and time of pollutant migration, which accelerate the speed of remediation and reduce post-processing procedures. In the process of treatment, the three technical methods promote each other, and have the advantages of good repair effect, short time, no secondary pollution and easy operation.

Presented is an electric field intensity compensation method for constructing a non-uniform electric field through an auxiliary electrode, including steps of: in a matrix electrode unit, designing an auxiliary electrode arrangement position according to the spatial distribution of the pollutant concentration; designing the polarity of the auxiliary electrode according to the position relationship between the auxiliary electrode and matrix electrodes; and constructing a non-uniform electric field by the auxiliary electrode and the matrix electrodes to implement space compensation of the electric field intensity. In the present invention, a non-uniform electric field matching a pollutant concentration field is constructed by setting the space arrangement and polarity of the auxiliary electrodes on the basis of the matrix electrodes according to the spatial distribution of the pollutant concentration, the contradiction of consistency between the heterogeneity of the spatial distribution of the pollutants and the removal efficiency of the uniform electric field is solved, and the spatial difference of efficiency of electrokinetically remedying organic contaminated soil is avoided, thereby improving the overall space remediation efficiency of electrokinetic remediation.

Method and system for soil remediation by flash Joule heating. A contaminated soil that includes organic pollutants and/or one or more metal pollutants can be mixed with carbon black or other conductive additive to form a mixture. The mixture then undergoes flash Joule heating to clean the soil (by the decomposing of the organic pollutants and/or removing of the one or more toxic metals, such as by vaporization).

The present invention belongs to the sewage treatment and sand remediation technology, it is about a new type of system and method about sand/water remediation with photocatalytic fuel cell. The characteristic photocatalytic fuel cell (PFC) using photons or solar energy to produce highly active electron/holes is introduced into soil remediation system to degrade pollutants. In the constructed Visible light photocatalytic fuel cell sand water remediation system, there was overlying water above polluted sands in a tubular reactor. Allowing static adsorption equilibrium to buildup, in the built photocatalytic fuel cell, the photocatalytic anode and photoelectric catalytic cathode were connected by wires with an external resistance. Using 50 W halogen lamp as the light source, it maintains photocatalysis and electrocatalytic reactions to degrade pollutants in the system. By degrading the pollutants in the overlying water, the pollutants in the sand were also desorbed and degraded, and rapidly decreased to a very low level. Thus in this system water purification treatment and sand remediation take place simultaneously.

Process for capturing and cleaning up pollutants by the formation of cement or concrete by electrolysis, the creation of a rocky conglomerate, assembly of sediments linked together by a calcium-magnesium deposit acting as binder. This process is thus applicable to the decontamination of ports, by enabling the capture of pollutants and by containing them in a sediment matrix.

A bioelectrochemical system device may be used to enhance groundwater pollutant chemical removal or degradation. Such a bioelectrochemical system may be inserted into the environment to be remediated through a variety of techniques, such as through insertion into wells or other access points, trench insertion, direct insertion, borehole insertion, or combinations thereof. In some aspects, the bioelectrochemical system device may have a hollow-tube configuration with an outer ring anode and inner ring cathode. In further aspects, the bioelectrochemical system device may have a modular form that can be combined with multiple other modules such one or more bioelectrochemical system devices.