Groundwater pollution has become an important environmental issue worldwide, and repairing groundwater has become a top priority for the environmental protection community. PRB technology (osmotic reaction grid) can effectively remove heavy metals, organic matter and other pollutants. At present, PRB technology is gradually replacing the extraction processing technology with high operating costs, and has become a new development direction for groundwater remediation. However, the selection of the PRB reaction medium is particularly important. Currently, the commonly used filling medium has a small specific surface area, a low pore gland ratio, and is easy to agglomerate. Most of them can only remove single pollutants, and have low removal rates of multi-phase pollutants. This seriously affects water. The processing effect limits the application of PRB technology. Therefore, Beijing Jinke Composite Materials Co., Ltd. developed the NFJ-PRB filling medium. This new material is a high-efficiency, low-consumption, low-cost, filling material that comprehensively physicochemically and biochemically treats pollutants, which greatly improves the repair capacity of PRB. .

Application Principle

     PRB technology refers to the establishment of a passive reaction zone in the underground by forming a wall of metal active materials to intercept sewage, which is transmitted by natural hydraulic transmission through the wall to react, and harmful substances are degraded, adsorbed, precipitated and removed.

     NFJ-PRB filling medium is made of ferrous metal porous material as the main raw material. It uses the characteristics of active metal chemistry and can form various forms of water-containing compounds under natural conditions. It plays the role of electrochemical enrichment, coagulation and adsorption. Under the action of sedimentation, flocculation, and adsorption, the effect of PRB technology on groundwater repair can be greatly enhanced. More importantly, the NFJ-PRB filling medium can provide sufficient space for the enrichment and growth of microorganisms, and provide a good "microenvironment" for the co-existence of various aerobic, facultative and anaerobic microorganisms in the biochemical reactor. This realizes the comprehensive treatment of pollutants by physicochemical and biochemical.

Product advantages

    1. An efficient, low-consumption, low-cost, filling medium for the physical and chemical and biochemical treatment of pollutants;

    At present, most PRB technologies use iron powder, activated carbon, zeolite, and quartz sand mixtures as reaction media. These combinations are not only costly to use, but also easy to fail, such as zeolites. NFJ-PRB filling medium only needs to be filled separately. Due to its special structure, it can play both physical and chemical and biochemical functions.

No secondary pollution

    For example, iron powder is more likely to undergo redox reactions under alkaline conditions, causing more precipitation in the reactor, which will cause blockage of the reactor; aluminum powder is susceptible to passivation, and the pH of the reaction system needs to be accurately controlled. In addition, aluminum salts may Damage to the human brain. Due to its special chemical composition, NFJ-PRB filling medium can form a large number of primary cells, effectively reduce harmful pollutants, and there are no problems such as passivation and clogging.

3. The activity retention time is long, and the processing function can be effectively used for a long time, which greatly reduces the cost problem caused by replacing the filling medium;

4. Uniform particle size, easy for construction and safety.

Product index

Application effect

     Lanzhou Jiaotong University successfully removed some metals and organics from groundwater through an experimental simulation device. The experimental water contains relatively high copper (> 10mg / L) and some organic substances such as 1,2-dichloroethane.

     The PRB technology is used to fill the NFJ-PRB medium. After continuous reaction, the copper concentration is less than 0.01 mg / L, and the concentration of 1,2-dichloroethane organic matter has also reached the corresponding standard.