Volcanic rock filter is to treat municipal sewage, industrial wastewater, domestic drainage filter material, of course, it is also the sewage in the growth of a variety of microorganisms, habitat, applied in sewage treatment, it has what kind of biological characteristics, can make a variety of microorganisms so like.
First, the porosity and the roughness of the surface are conducive to the adhesion and growth of microorganisms. More importantly, it can reduce the friction collision between the filter materials during the washing process, which will cause the attached microorganisms to fall off.
Second, the surface has a positive charge, while the microorganisms in sewage have a negative charge, because of this, it is also convenient for the growth of microorganisms fixation.
Third, large specific surface area of the filter material of volcanic rocks, in the filter tank of sewage treatment must choose specific surface area is big, opening high void fraction of empty inert filter material, is conducive to microbial contact hang membrane and growth remain more microbial quantity, is conducive to oxidation and the nutrients they need to microbial metabolic process and mass transfer process of metabolic waste.
Fourth, good mechanical strength, wear resistance, we in the selection for the application of sewage pool biological packing, must choose the mechanical strength, high hardness, it is not just a relationship in the process of water treatment for a wide variety of filter material collide with each other, but also related to the problem of life, high mechanical strength, hardness under the condition of use time long, still can keep the original size and shape when used in the acid alkali wastewater in the environment, it must have resistance to alkali corrosion resistance, can reduce the filter material or hang in the late backwashing membrane less wear and tear.
All in all, volcanic rock filter is a kind of high efficiency, energy saving, low cost and other advantages of the collection of a good water treatment material, is a new type of high efficiency purification filter, improve the ecological situation, improve the sustainable development of fisheries and agriculture, play an important role.As a material of aerated biological filter, volcanic rock filter material has unique physical, chemical and hydraulic properties.