NFJ-series PRB filling medium

Groundwater pollution has become an important environmental problem in the world, and the restoration of groundwater has become a top priority in the environmental protection field. PRB technology (permeable reactive grid) can effectively remove pollutants such as heavy metals and organic substances. At present, PRB technology is gradually replacing the extraction treatment technology with high operation cost and becoming the new development direction of groundwater remediation. However, the selection of PRB reaction medium is particularly important. Currently, the commonly used filling medium has the disadvantages of small specific surface area, low pore gland rate, easy caking, mostly removing only a single pollutant, low removal rate for multiphase pollutants, etc., which seriously affects the water treatment effect and limits the application of PRB technology. Therefore, Beijing jinke composition materials co., ltd. developed NFJ-PRB filling medium, this new material is a kind of filling medium with high efficiency, low consumption, low price and comprehensive physicochemical and biochemical treatment of pollutants, greatly improving the repair ability of PRB.

PRB technology refers to the construction of a metal active material wall underground to form a passive reaction zone to intercept sewage. Sewage reacts through the wall by natural hydraulic transmission, and harmful substances therein are degraded, adsorbed, precipitated and removed.

NFJ-PRB filling medium takes ferrous porous materials as the main raw materials, and takes advantage of the characteristics of active metal chemical properties and the formation of various forms of aqueous compounds in natural state to play the roles of electrochemical enrichment, coagulation and adsorption. Under the action of sedimentation, flocculation and adsorption, the remediation effect of PRB technology on groundwater can be greatly enhanced. More importantly, NFJ-PRB filling medium can provide sufficient space for the enrichment and growth of microorganisms, and provide a good "microenvironment" for the synergistic symbiosis of various aerobic, facultative and anaerobic microorganisms in the biochemical reactor. This realizes the comprehensive treatment of pollutants by physico-chemical and biochemical methods.

1. A filling medium with high efficiency, low consumption, low price and comprehensive physicochemical and biochemical treatment of pollutants;

At present, most PRB technologies use the mixture of iron powder, activated carbon, zeolite and quartz sand as the reaction medium. These combinations are not only costly to use, but also easy to fail, such as zeolite. NFJ-PRB filling medium only needs to be filled separately due to its special structure which can simultaneously perform both physicochemical and biochemical functions.

2. No secondary pollution will be generated

Iron powder is easier to carry out oxidation-reduction reaction under alkaline conditions, causing more precipitation in the reactor and causing reactor blockage; Aluminum powder is easy to passivation, and the PH value of the reaction system needs to be accurately controlled. In addition, aluminum salt may damage human brain. NFJ-PRB filling medium can form a large number of primary cells due to its special chemical composition, which can effectively reduce harmful pollutants without passivation and blockage.

3. The activity is kept for a long time, the treatment function can be effectively exerted for a long time, and the cost problem caused by replacing the filling medium is greatly reduced.

4. Uniform particle size and easy construction.

Application Effect

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

The concentration of copper was less than 0.01mg/L and the concentration of 1,2 dichloroethane reached the corresponding standard by using PRB technology and filling NFJ-PRB medium through continuous reaction.