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Multi-media filter, quartz sand filter, activated carbon filter are collectively referred to as mechanical filters.
A multi-media filter?
(1) quartz sand filter working principle
Multi-media filter (also known as mechanical filter) is a layered anthracite,sand, finely crushed garnet or other materials as a bed, a typical multi-media filter
The filter is shown in the figure:
(2) performance characteristics
Multi-media filters can remove the large particles in water suspended matterMulti-media filter can remove large particles of suspended solids in the water, thereby reducing the SDI value of water,
to meet the water quality requirements of deep purification. The equipment has a low cost, low operating costs, operation
simple; filter media after backwashing, can be used many times, long service life of the filter media, etc..?
(3) Application scope
Multi-media filter is widely used in water treatment process, mainly used for water treatment to remove turbidity, water softening, electrodialysis, reverse osmosis pre-treatment, but also can be used for surface water, groundwater, such as sediment removal.
(4) Product Introduction
The multi-media filters produced by this product can be categorized into manual type and full-automatic type according to the type of control. Manual type is mainly through the adjustment of the valve to control the operation of the filter, positive washing, backwashing; and automatic type is through the automatic filter type controller to carry out the control of the filter operation, positive washing, backwashing and other states, according to the tank material can be divided into glass fiber reinforced plastic tank, carbon steel tanks, stainless steel tanks, the inner wall of the tank can be made according to the requirements of the user to do the internal coating of epoxy coating or lining of corrosion resistance.The role of the activated carbon filter is mainly to remove large molecules of organic matter, iron oxides, residual chlorine. This is because the organic matter, residual chlorine, iron oxides are easy to make the ion exchange resin poisoning, and residual chlorine, cationic surfactants, etc. will not only make the resin poisoning, but also destroy the membrane structure, so that the reverse osmosis membrane failure.
Activated carbon filter working principle
Activated carbon adsorption principle is: the formation of a layer of balanced surface concentration on the surface of its particles, and then organic impurities adsorbed into the activated carbon particles, the use of the initial adsorption effect is very high. But over time, the adsorption capacity of activated carbon will be weakened to varying degrees, and the adsorption effect also declines. If the water quality in the aquarium is turbid and the organic matter content in the water is high, the activated carbon will soon lose its filtering function. Therefore, activated carbon should be cleaned or replaced regularly.
The size of the activated carbon particles also has an impact on the adsorption capacity. Generally speaking, the smaller the activated carbon particles, the larger the filtration area. Therefore, powdered activated carbon has the largest total area and the best adsorption effect, but powdered activated carbon easily flows into the aquarium with the water, which is difficult to control and is rarely used. Granular activated carbon due to particle molding is not easy to flow, organic matter in the water and other impurities in the activated carbon filtration layer is not easy to block, its adsorption capacity is strong, easy to carry and replace. The adsorption capacity of activated carbon is directly proportional to the time of contact with water, the longer the contact time, the better the quality of filtered water. Note: The filtered water should flow out of the filter layer slowly. New activated carbon should be washed and cleaned before the first use, otherwise there will be ink-black water flowing out. Activated carbon in the filter before loading, should be at the bottom and the top of the sponge paved 2 ~ 3 cm thick, the role is to prevent algae and other large particles of impurities penetrate into the activated carbon after 2 ~ 3 months, if the filtering effect declines should be replaced with new activated carbon, sponge layer should be replaced regularly.Activated carbon filter pressure vessel is a pressure vessel filled with coarse quartz sand bedding and high-quality activated carbon.
In the water quality pretreatment system, the activated carbon filter can adsorb the residual chlorine that can't be removed in the previous filtration to prevent the oxidative degradation of the reverse osmosis membrane in the later stage, and at the same time adsorption of small molecules from the previous level of leakage over the contaminating substances, such as organic matter, the odor in the water, colloid and pigment, heavy metal ions, etc. There is a more obvious adsorption and removal of water, and it also has a reduction of the role of COD. It can further reduce the SDI value of RO feed water to ensure SDI<5, TOC<2.Oppm. ?
The work of the activated carbon filter is done through the carbon bed. The activated carbon particles that make up the carbon bed have a very large number of micropores and a huge specific surface area, which has a strong physical adsorption capacity. When the water passes through the carbon bed, the organic pollutants in the water are effectively adsorbed by the activated carbon. In addition, there are some oxygen-containing tubular energy groups on the non-crystallized part of the surface of activated carbon, so that the organic pollutants in the water through the carbon bed are effectively adsorbed by the activated carbon. Activated carbon filter is a more commonly used water treatment equipment, as a water treatment desalination system pretreatment can effectively ensure that the service life of the latter equipment, improve the quality of the water, prevent pollution, especially to prevent the latter reverse osmosis membrane, ion exchange resin, etc., the free state of residual oxygen poisoning pollution.
The main factors affecting the adsorption effect and service life of the activated carbon filter are: the type and concentration of pollutants, airflow retention time in the filter material, air temperature and humidity. In actual selection, according to the type of pollutants, concentration and processing air volume and other conditions, to determine the filter form and type of activated carbon. Activated carbon filter upstream and downstream should have a good dust filter, its efficiency specification should not be less than F7. Upstream filter to prevent dust clogging the activated carbon material; downstream filter to stop the activated carbon itself dust.Removing iron and manganese filter working principle:
Groundwater is an excellent water resource, and has long been one of the main sources of water for urban residents, with the serious pollution of surface water, groundwater is becoming increasingly important to solve the current situation of water shortages of water quality for urban residents. However, due to the wide distribution of iron and manganese elements on the surface of the earth, the iron and manganese in various crystalline and sedimentary rocks are dispersed, and soluble iron salts are formed in the water by the dissolution of divalent iron oxides in carbonic acid-containing groundwater, the reduction of trivalent iron oxides in the reducing conditions, and the dissolution of organic matter on iron! Long-term drinking of water with high iron and manganese content will have adverse effects on human physiological health, more importantly, water containing iron and manganese can make white fabrics turn yellow, clogging of water pipes and bring great inconvenience to people's daily life. At the same time in the production process, iron and manganese can make the boiler scaling, so that the ion exchange resin poisoning failure, fabrics above the rust spots, so that the brewing of beverages change color and taste, especially manganese can make the water to produce a greater color change, due to the iron and manganese in the water is very harmful, the national regulations of the life of the water containing iron is not more than 0.3mg/l?, manganese content is not more than 0.1mg/l?. Therefore, the removal of iron and manganese in groundwater is particularly important.
The following is a brief description of the principle and process of iron and manganese removal through the iron and manganese filter process flow diagram.
Working Principle
Under the action of catalyst (such as manganese sand), the dissolved divalent iron or divalent manganese will be oxidized into insoluble trivalent iron or tetravalent manganese compounds, and then filtered to achieve the purpose of removing iron and manganese.

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