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In water treatment equipment, filters are primarily used to remove suspended solids, sediment, iron, manganese, and agglomerated flaky particles from raw water, as well as sticky colloidal particles that cannot be removed by sedimentation methods. Filters are generally made of steel lined with rubber or steel coated with epoxy resin. The filter media is composed of specially formulated anthracite powder, quartz sand, and manganese sand, which are properly graded according to different particle sizes in order to achieve primary water purification. Bag filters are a type of pressure-based filtration device; the liquid flows into the filter bags through the side inlet pipes on the filter housing, with the filter bags themselves being located within a reinforcing mesh. The filtration process is completed once the liquid passes through the filter bags with the desired level of fineness. Impurities and foreign objects remain inside the bag; use it only after replacing or removing those objects. Quartz sand filter: It is a water treatment device that uses quartz sand as the filtering medium. Under certain pressure, water with high turbidity is passed through layers of granular or non-granular quartz sand, which effectively traps and removes suspended solids, organic matter, colloidal particles, microorganisms, chlorine, unpleasant odors, and certain heavy metal ions from the water, thereby clarifying the water. Depending on the water production volume, quartz sand particles with different mesh sizes (different diameters) are required. Together with activated carbon, they form activated carbon filters; together with manganese sand and similar materials, they form iron and manganese removal filters. All of these are known as multi-media filters, and they are used for turbidity removal, water softening, and as pre-treatment steps before obtaining pure water. The turbidity of the treated water can be reduced to below 3 NTU. Extend the service life of downstream filtration equipment. The main raw materials for activated carbon filters are carbon-rich organic materials, such as coal, wood, and fruit shells. These carbon-containing materials are converted into activated carbon in an activation furnace through pyrolysis under high temperature and certain pressure. During this activation process, a large surface area and a complex pore structure are gradually formed, resulting in a unique porous structure that provides a large surface area and thus possesses strong physical adsorption capacity. An activated carbon filtration device uses activated carbon as the filtering medium, taking advantage of its inherent adsorption and decolorization capabilities to remove impurities from liquids, thereby purifying them. It is often used for preliminary pretreatment in reverse osmosis systems, as well as in situations involving the filtration of groundwater and wastewater that contain high levels of suspended solids. Widely used in water treatment projects across industries such as food, pharmaceuticals, electronics, chemicals, and industrial wastewater, it serves as a pretreatment device in the water treatment process. It is used to prevent pollutants in water from contaminating subsequent equipment, and it can also be employed to improve the odor and color of water. Activated carbon filters utilize the adsorption and decolorization properties of activated carbon itself to remove impurities from liquids, thereby purifying them. Precision filters (also known as safety filters) are typically constructed with a stainless steel casing, and contain filtering elements such as PP cotton inside. They are mainly used after multi-media pre-treatment filtration, and before membrane filtration devices such as reverse osmosis and ultrafiltration systems. It is used to remove fine particles that remain after multi-media filtration (such as tiny quartz sand and activated carbon particles), in order to ensure the precision of water purification and to protect the membrane filtration elements from damage caused by larger particles. The precision grades of the filter elements installed in precision filtration devices can be 0.5us, 1us, 5us, 10us, etc. Different filter precisions are selected depending on the application scenario, in order to ensure the quality of the water output and the safety of the subsequent membrane elements. The precision filtration device is mainly composed of a filtration housing and filtration elements; the filtration housing is mostly made of R304 stainless steel, while R316 stainless steel can be used for the housing in applications that require resistance to acids and alkalis. The filtering elements installed in the middle of the filter housing are mainly PP filter cotton cores; in some cases, wire-wound filters or activated carbon filters can also be used. The number of filter elements that can be installed ranges from one to several dozen, depending primarily on the volume of material to be processed. Article author: Lightlead Shanghai Water Treatment Equipment