Groundwater removal of iron and manganese in Inner Mongolia sewage treatment : groundwater removal of iron usually uses oxidation methods. Soluble divalent iron ions in water are oxidized to trivalent iron ions by the action of oxidants, and then produce ferric hydroxide colloids after hydrolysis, and then gradually aggregate into flocculent precipitates, which are then precipitated and filtered by ordinary sand filters Separated from the water. The iron and manganese removal filter is mainly suitable for groundwater iron and manganese removal in high iron and high manganese areas, industrial softening water, and pretreatment of salt water removal equipment. This equipment adopts the aeration oxidation, manganese sand catalytic, adsorption, and filtration principles of iron and manganese removal. The aeration device is used to dissolve oxygen in the air, and then oxidize Fe2 + and Mn2 + in the water to insoluble Fe3 + and MnO2. Combined with the catalysis, adsorption and filtration of natural manganese sand, the iron and manganese ions in the water are removed. Mainly used in food, beverage, papermaking, brewing industry, the treatment of iron-containing excess water, groundwater, well water as drinking water to remove iron, geothermal engineering and swimming pool circulating water needs.
After the groundwater containing iron (manganese) is flushed or an oxidant is added, the iron (manganese) ions in the water begin to oxidize. Inner Mongolia wastewater treatment. When water flows through the manganese sand filter layer, a contact oxidation reaction occurs in the filter layer and the surface biochemistry of the filter material occurs. Effect and physical interception and adsorption to remove and remove iron (manganese) ions in water. Especially in the process of treating micro-polluted manganese-containing groundwater, iron bacteria can not only effectively remove iron and manganese, but also use ammonia in water as a nutrient source for metabolism. With the participation of other bacteria, the effect of removing ammonia nitrogen can be achieved at the same time. The use of multi-media filter material's retention and filtration functions to remove large-sized impurity particles, colloids and suspended matter, has the characteristics of low cost, convenient operation and maintenance and management. Commonly used quartz sand, anthracite filter material, manganese sand, AFM, activated carbon, etc., high filtration speed, large interception capacity, long filtration cycle, Inner Mongolia sewage treatment tanks are made of FRP, carbon steel, stainless steel, and can be equipped with multiple channels Valves or electric, pneumatic and hydraulic valves are equipped with PLC control, suitable for small and medium flow and large flow, respectively, and can achieve automatic and manual control. The highest filtration accuracy can reach 5 microns. Oxidants such as oxygen, chlorine, and potassium permanganate that are commonly used for groundwater iron removal are the most convenient and economical to use oxygen in the air.
Oxidation and iron removal methods using oxygen in the air are divided into natural oxidation iron removal methods and contact oxidation iron removal methods. Natural oxidation iron removal methods are relatively slow. Generally, the contact oxidation iron removal methods are used without natural oxidation after aeration. Settling equipment, filter into the filter. The contact oxidation iron removal method includes aeration and filtration. The purpose of aeration is to oxygenate the water. Filtration is the use of filter materials to remove colloidal iron in water to achieve the effect of iron removal
Manganese removal from groundwater
Generally, iron and manganese coexist. Divalent iron oxidizes faster than divalent manganese. The presence of divalent iron will hinder the oxidation of divalent manganese. Therefore, for groundwater where iron and manganese coexist, iron and manganese should be removed first.
When the iron content and manganese content of groundwater are low, when removing manganese, the aerated contact method can be used to remove manganese in Inner Mongolia wastewater treatment .
Groundwater--aeration--catalytic oxidation filtration--effluent
3. Iron and manganese removal by contact oxidation
When the iron and manganese content of groundwater is low, a double-layer filter material for iron and manganese removal is generally used. The upper filter layer of Inner Mongolia sewage treatment is an iron removal layer and the lower part is a manganese removal layer. If the groundwater contains a large amount of iron and manganese, a two-stage aeration and filtration process is used, that is, first-stage iron removal and second-stage manganese removal: iron-manganese-containing groundwater—simple aeration—iron removal filter—full aeration —Manganese removal filter—Water