The pretreatment system of a large-scale pure water unit usually consists of a multi-media filter, an activated carbon filter, and a fully automatic water softener. Pretreatment The filter is made of stainless steel, glass fiber reinforced plastic, PVC and other materials as the outer shell, equipped with various filter materials (filter cloth, filter disc, sintered filter tube, honeycomb filter element, microporous filter element and multi-function filter element). Choose different filter materials to achieve different filtration efficiency.
Tank material: stainless steel, carbon steel (lined with epoxy resin) and glass steel
Control method: manual or fully automatic
The multi-media filter mainly uses one or several filter media. Under a certain pressure, water passes through the media to remove suspended solids and mechanical impurities in the water to reduce the turbidity of the effluent. Generally, the turbidity of the influent is less than 20 degrees. The turbidity of the effluent can reach below 3 degrees. The inner fillers are quartz sand, anthracite particles, granular porous ceramics, manganese sand, etc. to be selected and used as needed
Activated carbon has a long history of being used in water treatment. The first choice for water dechlorination is activated carbon adsorption, which can be completed with a very short contact time. Therefore, when the activated carbon filter is used for dechlorination, the flow rate can reach 10gpm/ft2 or higher. Activated carbon can adsorb organic matter and can trap organic matter on the loose surface. When the activated carbon filter is used to remove the odor and odor in the water, this adsorption process requires sufficient contact time, so the working flow rate should not be higher than 5 gpm/ ft2. The regeneration and backwashing of the activated carbon filter is very important. The backwashing and rinsing flow rate should be 10gpm/ft2, about 10 minutes; followed by the forward washing and discharge steps, about 5 minutes. After a period of use, usually 2 years, the adsorption capacity of the carbon will be exhausted and the filter bed must be replaced with new activated carbon.
The activated carbon filter uses the absorption performance of activated carbon to remove impurities in the liquid to purify the liquid. Its adsorption capacity is reflected in the following aspects:
Due to the small water production volume of the small water purifier, the complex pretreatment system is replaced by a multi-channel water quality pretreatment device, which greatly reduces the initial investment cost.