Multi-media filter is also called mechanical filter, its main function is to remove suspended matter and solid particles in water. Suspended solids are non-colloidal solid substances that do not dissolve in water, and they can settle when conditions are appropriate. The filter is used to intercept the suspended solids, and the weight difference before and after the filter medium intercepts the suspended solids is used as the basis for measuring the function of the filter. The filter medium generally uses filter media with D=0.5-1.0mm. According to the impurity composition in the water, single-layer filtration, double-layer filtration and multi-layer filtration can be used. Filter media include: quartz sand, anthracite, magnetite, manganese sand, diatomaceous earth, activated carbon, etc. Quartz sand filter is also called quartz sand filter as the filter material, anthracite coal as the filter material, anthracite filter as the filter material, manganese sand as the filter material, and activated carbon as the filter material.
The multi-media filter is based on the fact that when water flows through the bed of the filter medium, particles, suspended solids and colloids will adhere to the surface of the filter medium. The quality of the filtered water depends on the size and shape of impurities and the size of the filter medium, the composition of the raw water and the Operating conditions and bed height of filter media.
Multi-media filters are generally used as pretreatment equipment for advanced water treatment equipment in water treatment processes, and can also be used alone as ordinary filtering equipment in places where water quality requirements are not too high.
The function of the activated carbon filter is to remove organic matter, heavy metal ions, chroma, residual chlorine, etc. in the water, and it also has a certain removal effect on some pathogens and microorganisms. Its characteristics are good treatment effect and activated carbon can be regenerated.
The role of activated carbon is adsorption, and the adsorption of solutes from water to the surface of activated carbon is caused by the repulsion of water to hydrophobic solutes and the affinity of activated carbon to solutes. Organic colloidal substances and soluble polymer substances are often negatively charged, and are often adsorbed on the surface of the anion resin particles, and then diffuse into the resin network structure, entangled in the place where the resin has a high degree of crosslinking, and cover a part of the ion exchange Functional groups interfere with the free migration of normal ions. At the same time, it has poor resolution and pollutes the resin and ion exchange membrane (electrodialysis membrane), which can block the surface of the reverse osmosis membrane or make it inactive. In addition, some soluble organics have a strong affinity with the resin, and the acid and alkali cannot be regenerated and replaced, which will cause the ion exchange membrane, especially the anion exchange membrane and anion exchange resin, to poison and fail.
Far-sighted users should pay attention to the role of activated carbon filters in the selection of water treatment processes or equipment.
The use and operation method of the multi-media filter is very simple, you can read carefully the operation method of the filter in the electrodialysis operation regulations. The operating procedures of reverse osmosis equipment are also introduced in detail.
The manganese sand filter is mainly used to remove iron in water, especially to remove iron trioxide in water well, and it can also effectively remove manganese oxide.