Dissolved iron in groundwater generally exists in the form of low price Fe2+, and its Hypothetical chemical compound is bicarbonate. To remove iron in groundwater, it is necessary to oxidize divalent iron to trivalent iron. Under the condition of pH value of 6.8~7.2, High-valent iron and manganese compounds will be coagulated and settled by gel, and can be removed by filtration. Using oxidation separation technology to remove harmful substances such as iron and manganese from water, that is, filling sufficient O2 or O3 into the groundwater, and forming a unique catalytic membrane (MnO2 and MnO2 formed by manganese and iron on the gravel in the water) on the filter layer of the manganese sand filter γ- FeO (OH) precipitation) can oxidize the low valent iron and manganese in water into the combined precipitate of High-valent iron and manganese. This high-value sediment is retained in the filter layer, and the iron and manganese content of the effluent meets the standard requirements. Catalytic membranes play an important role in the treatment of iron and manganese in water: A. Catalysis accelerates the conversion of divalent iron into trivalent iron in water. B. Intercepting and separating iron and manganese from water. C. Biochemical catalysis membrane contains iron bacteria, which remove iron and manganese ions from water through their metabolism. During the process of oxidizing divalent iron to trivalent iron, sufficient dissolved oxygen must be maintained in the water. During this process, a portion of hydrogen sulfide is oxidized and blown off, while the remaining portion and small suspended solids in the water are adsorbed by activated carbon adsorbers.