Harm of excessive manganese

summary

With the improvement of people's living standards, drinking water safety has been paid more and more attention, especially the problem of excessive iron and manganese in water quality. Let's talk about the harm of excessive manganese.

Harm of excessive manganese

First: excessive iron and manganese in drinking water will cause great adverse effects on the human body. Too much iron in the body has an effect on the heart and is even more dangerous than cholesterol. Excessive intake of manganese can affect the central nervous system, affect intelligence and reproductive function, and cause anorexia, vomiting, diarrhea, gastrointestinal disorders and abnormal stool. Therefore, high iron and manganese water must be purified before drinking.

Second: if the concentration of iron and manganese exceeds a certain limit, it will produce reddish brown sediment. In life, it can leave yellow spots on white fabrics, water containers and sanitary wares. At the same time, it is also easy to make the iron raising bacteria multiply and block the pipeline. In industry, when used in textile, printing and dyeing, knitting, papermaking and other industries, it will affect the product quality. 　

Third: the iron in groundwater generally exists in the form of divalent iron ions. When oxygen is added, oxygen reacts with ferrous in water to oxidize ferrous into ferric in dark yellow colloidal state. When these iron in colloidal state encounter tiny pores, it is difficult to pass through, that is, it will accumulate on the surface of filter material, and form ferric filter membrane with contact catalytic activity on the surface of filter material particles. This kind of filter membrane can fully absorb ferric and finally remove water Excess iron to meet water requirements. 　

matters needing attention

The technological process and design scheme of removing iron and manganese from groundwater vary with the content of iron and manganese in groundwater, the pH value and the amount of treated water. When the iron content in the water is less than 10mg / L and pH = 5.5, it is designed as primary aeration and primary filtration; when the iron content in the water is 10 ~ 20mg / L and pH = 5.5, it is designed as primary aeration and secondary series filtration; when the iron and manganese in the water are to be removed, in principle, the iron is removed first and then the manganese is removed; when the carbon dioxide is contained in the water, the raw water should be aerated once or twice to remove the corrosive dioxide in the water Then iron and manganese are removed.