Technical principle: refers to the downstream of the source of trenches excavation, placement of continuous or non-continuous permeability of the reaction wall, which filled the reaction medium, and groundwater flowing through the physical, chemical and biochemical reactions, groundwater pollution Objects can be blocked, fixed or degraded. Technical Features: The pollutants released from the pollution source are dissolved in the water during the seepage downstream to form a plume polluted by groundwater, which is treated and purified through physical, chemical and biological processes via the reaction wall. In situ reaction wall repair technology, the most important functional unit for the in situ reactor. The type of reaction wall (PRB) is chosen according to the specific geological and hydrological conditions and the spatial distribution of pollutants. The PRB is divided into funnel-gate PRBs and continuous water-permeable PRBs by structure. Funnel - Door PRB: consisting of impermeable partition wall, water-conducting door and PRB, suitable for shallow aquifers with large pollution area; Continuous Permeable PRB: Suitable for submerged aquifers with shallow depth and contaminating plumes. System structure and main equipment: divided into single-processing system and multi-unit processing system. The basic structure types of PRBs include continuous wall PRBs and funnel-gated PRBs, as well as improved configurations such as curtain-type PRBs, injection-type PRBs, siphon-type PRBs, and bulkhead-in-situ reactors Etc., apply to a single pollutant, a lower concentration of pollutants, plume size smaller sites; Multi-unit processing system is suitable for more types of pollutants, the situation is complex venues. Multi-unit processing system can be divided into two series and parallel structure. The tandem processing system is mostly used in the contaminated sites with more complicated pollution components. For different contaminated components, each processing unit in the tandem system can be filled with different active fillers to achieve the simultaneous removal of multiple pollutants. The main equipment: trench construction equipment (double wheel slot machines, chain excavators, etc.), curtain wall construction equipment (large auger, pile driver, etc.), monitoring systems (hydrogen, redox potential, pH, hydrogeology, Pollutants, reactive wall permeability changes and changes such as online monitoring system) and so on. Key technical parameters or indicators: including PRB installation location selection, structure selection, depth, size, hydraulic retention time, orientation, the permeability of the reaction wall, the choice of active materials and their ratio. Paints And Coatings,Silica For Paints And Coatings,Hydrophilic Silica As Matting Agent,Low Pvc Wood Coatings Henan Minmetals East New Materials CO. LTD. , https://www.silicon-materials.com