Soil drenching technology

       With the help of solvents that can promote the dissolution or migration effect of contaminants in the soil environment, the cleaning fluid is pushed through the hydraulic pressure head and injected into the contaminated soil layer, and then the liquid containing the contaminants is extracted from the soil layer for separation and treatment, which can be divided into in-situ and ex-situ chemical drenching techniques.

Curing and stabilization technology

       Through chemical and physical processes, contaminated soil is mixed with binders to form solidified bodies to achieve physical blockage (e.g., reduce porosity, etc.) or chemical reactions to form solid precipitates (e.g., form hydroxide or sulfide precipitates, etc.), thereby reducing the mobility and activity of contaminants.

Soil Gas Phase Extraction Technology

       A method to purify soil by arranging extraction wells in unsaturated soil layers and using vacuum pumps to generate negative pressure to drive air flow through the pores of contaminated soil, desorbing and entraining organic pollutants to flow to the extraction wells, and eventually treating the contaminated tail gas above ground. To enhance the treatment effect, several air injection wells are usually installed in the contaminated soil to inject air into the soil to form an air circuit to facilitate the resolution and removal of soil contaminants. The main components include gas phase extraction wells, vacuum pumps, observation points, and gas phase post-purification treatment systems.

Phytoremediation Technology

       Phytoremediation is mainly a treatment technology to achieve soil purification and ecological effect recovery by cultivating and selecting plants with strong tolerance to high concentrations of metals, using specific plants to absorb, transform, remove or degrade pollutants in the soil, and enhancing the fixation of soil pollutants through the accumulation of metals in the roots. Mainly through three ways: direct plant uptake of pollutants and hyperaccumulation of pollutants; enzymes secreted by plant roots to degrade organic pollutants; and joint metabolic action of inter-root and microorganisms, thus absorbing, transforming and degrading pollutants.

Air Injection Restoration Technology

       Air injection technology is developed based on SVE, which vaporizes contaminants in groundwater by injecting air into the aquifer, while increasing the concentration of oxygen in the ground and accelerating microbial degradation in the saturated and unsaturated zones. The vaporized contaminants enter the air-packed zone and can be extracted by pumping devices for post-treatment. Volatile organic pollutants dissolved in the groundwater, adsorbed on the soil in the saturated zone and lodged in the pores of the soil in the gas envelope can be remediated.

Permeable reactive wall technology

       It is an in-situ remediation technology, mainly through excavating trenches downstream of the pollution source, placing continuous or discontinuous plant mat permeable reactive walls, filling them with reactive media, and conducting physical, chemical and biochemical reactions with the flowing groundwater to intercept, fix or degrade the pollutants in the groundwater.

Chemical Redox Technology

      An in-situ groundwater remediation technology that uses redox reagents introduced into the subsurface to react with contaminants in the groundwater to achieve purification. By using an infiltration grid to control the form of oxidant or reducing agent release, the impact of these geochemical changes or other sensory indicators can be minimized beyond the direct treatment area.

Electric Restoration Technology

       In-situ remediation techniques that use electrokinetic effects to remove contaminants from groundwater. Electrokinetic effects include electrodialysis, electromigration, and electrophoresis. Electrodialysis is the movement of soil pore water under the action of an applied electric field, mainly removing non-ionic contaminants; electromigration is the movement of ions or complex ions to opposite electrodes, mainly removing charged ions in groundwater; electrophoresis is the migration of charged particles or colloids under the action of a DC electric field, mainly removing contaminants adsorbed on movable particles.