There are provided processes for treating a residual. For example, such processes can comprise treating a mixture comprising the residual, a peracid or source thereof and an ammonium salt in a reactor, with an electric field, by means of at least one anode and at least one cathode that define therebetween an electrokinetic zone for treating the mixture. Such processes allow for inactivation of at least one type of pathogen in the residual so as to obtain a treated residual.

An oil-contaminated soil and groundwater treatment system, in which the polluted groundwater pumped into the electrocatalytic device uses a high-voltage electric field to change the structure of water molecules. After high voltage discharge, electrocatalysis and electrolysis, alkaline reduced water, acidic oxidized water and neutral water can be quickly produced. By the oxidation effect of electrocatalytic device anode, chloride ions and dissolved oxygen in water generate hypochlorous acid and superoxide ions, and the interaction between the two generates hydroxyl radicals and microbubbles with high oxidizing ability and long-lasting oxidation, thereby effectively remediating soil and groundwater polluted by total petroleum hydrocarbons.

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.

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.

A method for removing pollutants by using a mixed microbial solution of beneficial microorganisms to enhance electrokinetic force. It includes a mixed microbial solution; an anode tank and a cathode tank are connected to an external power supply. A soil tank contains contaminant soil and the soil tank is positioned between the anode tank and the cathode tank which are parallel to each other. A soil-retaining net is disposed over the soil. The external direct current is used to allow the mixed microbial solution to transfer in the soil tank.

Disclosed is an electrokinetic-aeration-liquid injection combined remediation method for compound contaminated soil containing heavy metals and organic substances, and belongs to the field of contaminated soil remediation. According to the present application, in the combined remediation method, the electrokinetic remediation method enables water in soil to migrate from bottom to top to drive heavy metals and organic substances to be enriched towards the top; bubbles generated by the aeration method are diffused from the bottom to the top to drive volatile organic compounds to move towards the top soil. During liquid injection process, the electrolyte is driven to move from bottom to top under the action of electrokinetic remediation flow, which can keep the pH of the soil stable and remediate heavy metals and organic pollutants. The whole processes are simultaneously completed by adopting the dual-channel porous EKG electrode designed by the present application, which is efficient and convenient.

Disclosed are a repair adjusting system for thermal-assisted in-situ chemical oxidation and an adjusting method. The repair adjusting system for thermal-assisted in-situ chemical oxidation comprises a chemical oxidation adjusting system and a controller, the chemical oxidation adjusting system is provided with a temperature monitor, a magnetic oxidant concentration monitor, a pollutant concentration monitor and a reaction control device, the controller is respectively connected with the temperature monitor, the magnetic oxidant concentration monitor, the pollutant concentration monitor and the reaction control device, and the controller controls an oxidation process of the chemical oxidation adjusting system through the reaction control device according to output data of the temperature monitor, the magnetic oxidant concentration monitor and the pollutant concentration monitor.

Disclosed is an electrokinetic-aeration-liquid injection combined remediation method for compound contaminated soil containing heavy metals and organic substances, and belongs to the field of contaminated soil remediation. According to the present application, in the combined remediation method, the electrokinetic remediation method enables water in soil to migrate from bottom to top to drive heavy metals and organic substances to be enriched towards the top; bubbles generated by the aeration method are diffused from the bottom to the top to drive volatile organic compounds to move towards the top soil. During liquid injection process, the electrolyte is driven to move from bottom to top under the action of electrokinetic remediation flow, which can keep the pH of the soil stable and remediate heavy metals and organic pollutants. The whole processes are simultaneously completed by adopting the dual-channel porous EKG electrode designed by the present application, which is efficient and convenient.

A soil and water quality improvement method includes the following steps. An electrode element is disposed into a tubular body and he tubular body includes a plurality of through holes formed therein. The tubular body is then buried in a growing medium to be improved. Afterwards, ozone water is introduced into the tubular body and the ozone water is spread through the through holes into the growing medium to carry out an operation of sterilizing, and then electricity is conducted into the electrode element to carry out electrolysis. After the operations, an inspecting element is used to inspect the growing medium. Finally, the nutrition additive is conducted into the growing medium through the tubular body to complete the improvement of the growing medium, allowing a contaminated growing medium to be reused for cultivation.

Disclosed are a repair adjusting system for thermal-assisted in-situ chemical oxidation and an adjusting method. The repair adjusting system for thermal-assisted in-situ chemical oxidation comprises a chemical oxidation adjusting system and a controller, the chemical oxidation adjusting system is provided with a temperature monitor, a magnetic oxidant concentration monitor, a pollutant concentration monitor and a reaction control device, the controller is respectively connected with the temperature monitor, the magnetic oxidant concentration monitor, the pollutant concentration monitor and the reaction control device, and the controller controls an oxidation process of the chemical oxidation adjusting system through the reaction control device according to output data of the temperature monitor, the magnetic oxidant concentration monitor and the pollutant concentration monitor.