The role of activated carbon filters in pure water treatment equipment

Pure water equipment on the market mainly uses reverse osmosis membrane treatment technology. Impurities and ions in the water are purified by membrane separation. Raw water needs pretreatment before entering the membrane, and the pretreatment unit contains an activated carbon filter. The activated carbon filter plays a crucial role in pure water equipment, mainly for the following reasons:

1. Adsorption of Organic Matter

Water usually contains various natural organic compounds, such as humic acid and fulvic acid. These organic compounds may originate from soil erosion, plant decomposition, etc. Activated carbon has a large specific surface area, and its microporous structure can effectively adsorb these organic molecules. For example, humic acid is a large-molecule organic acid that affects the chemical stability and taste of water.

Industrial wastewater and domestic sewage may also contain synthetic organic compounds, such as pesticide and detergent residues. Activated carbon can adsorb these organic pollutants, removing odors and color from the water.

2. Removal of Residual Chlorine

In the disinfection process of tap water, chlorine or other chlorine-containing disinfectants are usually added. Although disinfected water can kill harmful microorganisms, the presence of residual chlorine may adversely affect the subsequent pure water production process. For example, residual chlorine can oxidize the reverse osmosis membrane (a key component in pure water equipment), shortening its lifespan.

3. Removal of some heavy metal ions from water

Activated carbon also has a certain adsorption effect on some heavy metal ions, such as mercury, lead, and cadmium. This is because the functional groups (such as carboxyl and hydroxyl groups) on the surface of activated carbon can undergo ion exchange or complexation reactions with heavy metal ions. For example, when water contains trace amounts of lead ions, the functional groups on the surface of activated carbon can combine with lead ions, adsorbing them onto the activated carbon surface, thereby reducing the content of heavy metal ions in the water and reducing the harm of heavy metals to human health and equipment.