1. Product Introduction

According to different filter media, their uses and functions also vary, generally including quartz sand, activated carbon, manganese sand, anthracite, etc. The filter material used is quartz sand, also known as quartz sand filter. The filter material used is anthracite, which is called anthracite filter. The filter material used is manganese sand (excluding iron and manganese), which is called manganese sand filter. The filter material used is activated carbon, which is called activated carbon filter. It can also be used in combination. The main function of a manganese sand filter is to remove suspended solids, mechanical impurities, and organic matter, reduce water turbidity, adsorb and remove pigments, residual chlorine colloids, and iron ions from water. The size of the machine can be selected according to the filtration capacity, and it is very easy to use and operate.

Iron and manganese coexist almost simultaneously in underground (well) water. When the iron content is high, the water has an iron fishy smell, which affects the taste of the water. As a production water for papermaking, textiles, printing and dyeing, chemicals, and fine leather, it can reduce product quality. Iron containing iron can cause rust spots on production tools, yellow or brownish yellow stains on laundry, and iron sediment Fe2O3 can grow iron bacteria, block pipelines, and sometimes produce red water. Water with high manganese content is similar to water with high iron content, which can cause discoloration, odor, and damage to the quality of industrial products such as textiles, papermaking, brewing, and food. Household appliances can be contaminated with brown or black color, and washing clothes may have slight black or light gray stains. For this reason, China's "Sanitary Standards for Drinking Water" (GB5749-85) stipulate that the iron content should be ≤ 0.3 mg/L and the manganese content should be ≤ 0.1 mg/L. Raw water that exceeds the standards must undergo iron and manganese removal treatment. Long term consumption of water with high iron and manganese content can seriously affect physical health and have a strong corrosive effect on production equipment.

Quartz sand/manganese sand filter is a type of filter material that uses quartz sand or manganese sand as fillers. Beneficial for removing impurities from water. It also has the advantages of low filtration resistance, large specific surface area, strong acid and alkali resistance, and good pollution resistance. The unique advantage of quartz sand/manganese sand filters lies in optimizing the design of filter media and filters, achieving adaptive operation of the filter. The filter media has strong adaptability to raw water concentration, operating conditions, pre-treatment processes, etc., that is, the filter bed automatically forms an upper sparse and lower dense state during filtration, which is conducive to ensuring the quality of effluent water under various operating conditions. During backwashing, the filter media is fully dispersed, and the cleaning effect is good. Sand filters can effectively remove suspended solids in water and have a significant removal effect on pollutants such as colloids, iron, organic matter, pesticides, manganese, bacteria, viruses, etc. And it has the advantages of fast filtration speed, high filtration accuracy, and large interception capacity. Mainly used in various fields such as power, electronics, beverages, tap water, petroleum, chemical, metallurgical, textile, papermaking, food, swimming pools, municipal engineering, etc. for the deep treatment of process water, domestic water, recycled water, and wastewater.

2. Handling method

Water with high iron and manganese content is generally treated with catalysts (such as manganese sand) to oxidize dissolved divalent iron or divalent manganese into insoluble trivalent iron or tetravalent manganese compounds, respectively. The backwash function of the manganese sand filter is used to achieve the purpose of removal and purification.

4Fe2++O2+10H2O 4Fe(OH)3+8H

2Mn2++O2+2H2O 2MnO2+4H+

3. Technical requirements

The natural manganese sand used for removing iron and manganese from groundwater should have manganese oxide as the main form of manganese. Natural manganese sand filter with manganese content (calculated as MnO2) not less than 35% can be used for both iron and manganese removal in groundwater; Natural manganese sand filter with a manganese content of 20% to 30% is only suitable for iron removal in groundwater; Manganese ore sand with a manganese content of less than 20% should not be used; It is advisable to prioritize using natural manganese sand varieties that have been scientifically tested or proven to achieve good iron and manganese removal effects in production as filter media.