Method and system for removing iron and manganese from underground water

Abstract

The invention discloses a method and a system for removing iron and manganese from underground water. The method comprises the following steps: a, delivering the underground water into a membrane reaction tank, introducing ozone-containing gas into the membrane reaction tank, carrying out ozone aeration through an aerator, allowing ozone to dissolve in the underground water, oxidizing iron into ferric hydroxide precipitates, separating the ferric hydroxide precipitates from the water, oxidizing the manganese into MnO2 particles which cannot be dissolved in the water, and at the same time, carrying out oxidization degrading on odor substances and organic substances in the underground water; and b, controlling ozone-containing water flow to rise and be in contact with a ceramic membrane assembly in the membrane reaction tank, wherein the pore diameter of a ceramic membrane is 10-100nm, the transmembrane pressure difference during filtering is -30kPa to 0, and the water flow filtration flux is kept at 80-120L/m<2>.h; and allowing the ferric hydroxide precipitates, the MnO2 particles and turbid particles in the water to be intercepted and precipitated, and carrying out ozone degradation on the odor substances and part of the organic substances in the water via the ozone in ceramic membrane holes. The removing method and system can effectively and efficiently remove the iron, the manganese and the organic substances in the underground water.

Description

[0001] 【Technical field】 [0002] The invention relates to advanced treatment technology for drinking water or regenerated water, in particular to a method and system for removing iron and manganese in groundwater. [0003] 【Background technique】 [0004] The drinking water of residents in some cities and most towns in my country is mainly based on groundwater, which is generally of good quality, less prone to pollution, simple to treat, and low in operating costs. However, the groundwater in most areas of our country often contains excessive iron and manganese, which does not meet the requirements of sanitary standards for drinking water and seriously affects people's production and life. Excessive long-term low-dose intake of manganese can cause chronic poisoning, paralysis agitans, mental disorders similar to schizophrenia and Parkinson's disease-like extrapyramidal syndrome, and finally permanent disability. [0005] At present, the commonly used treatment method is the "r...

AI Technical Summary

Problems solved by technology

The existing problems mainly include the following aspects: 1) when the concentration of iron and manganese in water is high, it is not enough to oxidize iron and manganese in water into granular state; 2) the formed MnO 2 The particles are relatively fine, and it is difficult to completely intercept them by ordinary filtration, and it is easy to cause the water manganese to fail to meet the standard; 3) When using the contact oxidation method to remove iron and manganese, the mature filter material can deposit high-valent hydroxides or oxides of manganese on the The surface of the filter material, but the manganese layer in the filter material will move down with the extension of the filtration time, and finally the phenomenon of penetration will occur

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