Application principle of porous ceramics in pollution control

30-12-2020

Application principle of porous ceramics in pollution control


Porous ceramic filter material is chemically stable, select appropriate materials and processes, can be made into acid-resistant, alkali-resistant porous products, and will not chemically react with other substances, thereby causing secondary pollution; high porosity, up to 20 %95%, with uniform pore size distribution and controllable size, high permeability; high strength, high rigidity, no shape change and pore deformation under impact pressure; good thermal stability, no thermal deformation, softening, Oxidation phenomenon, the working temperature can be as high as 1000 ; its own clean state is good, non-toxic, odorless, no foreign matter falling off, and no secondary pollution; small volume density, developed specific surface area and unique surface characteristics, can absorb and filter In addition to a large amount of tiny suspended matter, it has selective permeability to liquid and gas media; strong reproducibility, through backwashing with liquid or gas, the original filtering capacity can be basically restored, so that it has a long service life and good antibacterial performance , Not easily degraded by bacteria.

These excellent properties ensure the application advantages of porous ceramics in many fields. Generally, on the basis of ensuring mechanical strength, chemical stability, and thermal stability, higher porosity, larger specific surface area, and narrower and uniform pore diameter are required as much as possible.

porous ceramic


Due to its many excellent characteristics, porous ceramics have become a promising eco-environmental material and have been widely used in environmental management.

 

Porous ceramics have a special structure. When the filtrate passes through, pollutants such as suspended matter, colloids and microorganisms are blocked on the surface or inside of the filter medium, and viruses attached to the contaminants are also blocked. This process is a combination of adsorption, surface filtration and deep filtration, and deep filtration is the main one.Due to the well-developed pore structure, the specific surface area of porous ceramics is relatively large, which can adsorb tiny suspended solids in water, mainly physical adsorption. Surface filtration mainly occurs on the surface of the filter medium. The porous ceramic plays a role of sieving. The particles larger than the pore size are intercepted, and the intercepted particles cause bridging on the surface of the filter medium, forming a layer of filter membrane. The layered filter membrane can also play an important filtering role, preventing impurities from entering the filter layer and clogging the micropores quickly. Deep filtration takes place inside the porous ceramics. Due to the tortuous channels of the porous ceramics, the arch bridge effect formed by the fluid medium on the particle surface, and the influence of inertial collisions such as Brownian motion, the filtration accuracy is much smaller than its own pore size. For liquid media, it is about 1/5 to 1/10 of the pore size of porous ceramics, and for gas media, it is about 1/10 to 1/20 of the pore size.

 ceramic

At present, porous ceramics have been widely used in wastewater and waste gas treatment. Such as treatment of boiler wet dust removal wastewater, heavy metal wastewater, and treatment of high-temperature dust-containing gas for dust removal.




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