Multi-media filter is a device that uses one or more filter media to purify water quality. Its working principle is based on physical filtration mechanism. When water with high turbidity passes through a certain thickness of granular or non-granular material under a certain pressure, it can effectively remove suspended impurities and make the water clear. This equipment is widely used in water treatment, turbidity removal, softening water, pure water pretreatment and other fields, and can control the turbidity of the outlet water below 3 degrees.
The core of multi-media filter lies in the different types of filter media filled inside it. Commonly used filter media include quartz sand, anthracite and manganese sand, etc., each of which plays a different role. Quartz sand is usually used as the first layer of filter material because of its hardness and stable chemical properties. It is mainly used to intercept larger particles of suspended matter. The water flow first passes through this layer of filter material, and large particles of impurities are trapped on the surface or in the gaps of the quartz sand, thereby preliminarily purifying the water quality.
Next, the water flow will pass through the anthracite layer. Anthracite has a large specific surface area and can absorb smaller suspended particles and some organic matter, which helps to improve the color and odor of water. Anthracite can not only further reduce the content of suspended matter in water, but also improve the overall sensory quality of water quality. For some water sources with high concentrations of iron and manganese ions, manganese sand can also be used as filter media. Manganese sand converts soluble iron and manganese into insoluble precipitates through redox reactions and removes them, which is particularly important for water source treatment in certain specific areas.
Throughout the process, the raw water passes through different layers of filter media under pressure, and each layer of filter media filters and adsorbs impurities in the water step by step according to its characteristics. The coarser filter media is responsible for intercepting larger particles, and as the water flow gradually penetrates into the finer filter media layer, smaller particles are also gradually removed. This design not only improves the filtration efficiency, but also extends the service life of the filter media.
In order to ensure long-term and effective operation, the multi-media filter needs to be backwashed regularly to remove impurities accumulated in the filter media. This process restores the filtration capacity of the filter media and ensures the subsequent filtration effect. Modern multi-media filters provide two operating modes: automatic and manual. Users can choose the appropriate operating mode according to actual needs, which is convenient and flexible.
The shell material of multi-media filter is diverse, and the common ones are fiberglass, carbon steel anti-corrosion or rubber lining, and all stainless steel. The choice of these materials mainly depends on the specific requirements of the use environment, such as corrosion resistance and mechanical strength. Whether in industrial production or daily life, multi-media filter is an important pretreatment device for deep water purification. It can not only significantly improve water quality, but also lay a good foundation for subsequent water treatment steps. In short, through the reasonable configuration of different types of filter materials and appropriate maintenance measures, multi-media filter can efficiently purify water in various occasions and meet people's demand for clean water.
