Manganese sand filter media

Product Function

Manganese sand filter media are mainly used to remove iron and manganese substances in the system and purify water quality; they can also be used for water decolorization and deodorization.

Scope of application

It is used in food, beverage, papermaking, brewing industry, treatment of water with excessive iron content, iron removal of groundwater and well water as drinking water, geothermal engineering and swimming pool circulating water.

Product Features

1. The unique multi-filter chamber structure can realize online backwashing (filtering, sewage discharge and backwashing are carried out simultaneously).

2. Power saving: the outlet water is directly supplied to the pipe network, and there is no need to set up a secondary water supply system; it has its own backwashing function, and there is no need to set up a backwashing water pump.

3. Water saving: This equipment adopts a "plum blossom water distributor" to shorten the distance between the filter layer and the water distribution pipe, which can save a lot of backwashing water.

Technical parameters

1. Treatment effect:

(1) Iron content: ≤0.3mg/L;

(2) Manganese content: ≤0.1mg/L;

(3) Effluent turbidity: <3FTU.

2. Influent requirements:

(1) Iron content: ≤20mg/L;

(2) Manganese content: ≤3mg/L;

(3) Influent turbidity: <20FTU;

(4) Alkalinity: ≤2mg/L;

(5) pH value: >6.0 (for iron removal), >7.5 (for manganese removal).

3. Working environment parameters

(1) Working temperature: 5-60℃ (special temperature can be customized);

(2) Working pressure: ≤0.6MPa.

4. Operation parameters

(1) Working mode: pressure type;

(2) Operation mode: water flow from top to bottom, series (high iron and manganese content) or parallel;

(3) Filtration speed: 6-10m/h (for iron removal), 5-8m/h (for manganese removal);

(4) Operation cycle: depends on the quality of raw water, the minimum is not less than 8 hours;

(5) Backwashing method: water washing, or air-water combined backwashing;

(6) Backwashing time: 10-15min;

(7) Backwashing water consumption: 1-3%;

(8) Backwashing intensity: 15-20L/s·m2.

5. Working Principle

The iron and manganese removal filter consists of an aeration device and a manganese sand filter tank; the low-valent iron ions and low-valent manganese ions in the water are oxidized into high-valent iron ions and high-valent manganese ions by oxidation method, and then removed by adsorption filtration to reduce the iron and manganese content in the water.

1. Process Flow

Aeration → Contact Oxidation → Adsorption Filtration → Backwashing

2. Operation process

(1) Aeration

Depending on the water quality, deep well water residual pressure jet aeration or compressed air aeration is used, and the pipeline is mixed with dissolved oxygen, which is stable and reliable. The aeration method increases the dissolved oxygen in the water on the one hand; on the other hand, it removes CO2 to increase the pH value of the water, oxidizes the divalent iron into trivalent iron precipitation, and then filters it.

(2) Contact oxidation

The filter material uses natural manganese sand filter material, which has a double layer of catalytic and filtering effects.

The main component of natural manganese sand is manganese dioxide (Mno2), which is a good catalyst for oxidizing Fe2+ to Fe3+.

When the pH value of iron-containing groundwater is greater than 5.5, it can oxidize Fe3+ to Fe3+ when it comes into contact with natural manganese sand. The reaction is as follows:

a.4MnO2+3O2=2Mn2O7

b.Mn2O7+6Fe2++3H2O=2MnO2+6Fe3++6OH-

The generated Fe3+ is immediately hydrolyzed into flocculent iron hydroxide precipitate: Fe3++3OH-=Fe(OH)3↓

(3) Adsorption filtration

a. Remove the floccules (Fe(OH)3 precipitate) formed by Fe3+ after passing through the manganese sand filter layer;

b. Catalyze the oxidation of most of the unoxidized Fe2+ and the ion exchange of hydroxyl oxidation to remove iron.

The iron removal mechanism of Manganese sand filter media, in addition to relying on its own catalytic effect, also gradually forms a layer of iron filter membrane on the surface of the manganese sand filter material during filtration as an active filter membrane, which can play a catalytic role. The newly generated hydroxyl iron as an active filter membrane material participates in the new catalytic iron removal process, so the active filter membrane iron removal process is an automatic catalytic process.

The principle of manganese removal is the same as the removal method of divalent iron.

(4) Backwashing

The system can be controlled manually or automatically. It is required to backwash the manganese sand regularly to remove impurities such as suspended matter that may be intercepted, and to loosen the manganese sand and cushion layer. Since the filter is equipped with a backwashing device, a backwashing water pump is not required.