Shallow sand filter for agricultural irrigation manganese sand filter

Introduction:

In the field of water treatment, manganese sand filters have become an indispensable and important component of many water treatment systems due to their efficient iron and manganese removal performance and stable operating characteristics. It can effectively remove impurities such as iron and manganese from water, improve water quality, and provide clean and safe water for people's production and life. This article will provide a detailed introduction to the working principle, structural characteristics, application areas, and maintenance of manganese sand filters.

Technical parameters:

Inlet water quality requirements:

Iron content ≤ 20mg/L

Manganese content ≤ 3mg/L

Inlet turbidity<15mg/L

Alkalinity ≤ 2mg/L (This indicator may vary depending on specific application scenarios and needs to be determined according to actual situations)

PH value: For iron removal, the pH value should be greater than 6.0; For manganese removal, the pH value should be greater than 7.5. This is because the oxidation precipitation effect of iron and manganese ions varies under different pH conditions.

Water temperature: Generally required to be within the normal temperature range, but the specific temperature can be adjusted according to the actual situation.

Working environment parameters:

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

Work pressure: ≤ 0.6MPa

Operating parameters:

Filtration speed: Generally 6-10m/h for iron removal and 5-8m/h for manganese removal

Operation mode: The water flow is from top to bottom, and series or parallel operation can be selected according to the iron and manganese content in the raw water.

Operating cycle: Depending on the quality of the raw water, but not less than 8 hours at the minimum.

Backwashing method: water washing or a combination of air and water backwashing

Backwash time: usually 10-15 minutes

Backwash water consumption: usually 1-3% of the inflow

Backwash strength: generally 15-20L/s · m ² (or may vary depending on specific equipment specifications)

Filter material selection:

The form of manganese sand should be mainly manganese oxide, and the ideal natural manganese sand filter material should have a manganese content (calculated as MnO ₂) of not less than 35%. 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.

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Operating parameters:

Filtration speed: Generally 6-10m/h for iron removal and 5-8m/h for manganese removal

Operation mode: The water flow is from top to bottom, and series or parallel operation can be selected according to the iron and manganese content in the raw water.

Operating cycle: Depending on the quality of the raw water, but not less than 8 hours at the minimum.

Backwashing method: water washing or a combination of air and water backwashing

Backwash time: usually 10-15 minutes

Backwash water consumption: usually 1-3% of the inflow

Backwash strength: generally 15-20L/s · m ² (or may vary depending on specific equipment specifications)

Filter material selection:

The form of manganese sand should be mainly manganese oxide, and the ideal natural manganese sand filter material should have a manganese content (calculated as MnO ₂) of not less than 35%. 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.

working principle

The manganese sand filter mainly utilizes the catalytic oxidation effect of manganese sand to remove iron and manganese from water. When water containing iron and manganese passes through the manganese sand filter layer, a layer of catalytically active iron filter membrane and manganese filter membrane will be formed on the surface of the manganese sand. This filter membrane can accelerate the oxidation reaction of divalent iron and divalent manganese in water, converting them into insoluble hydroxides of trivalent iron and tetravalent manganese, thereby achieving the goal of removing iron and manganese.

The specific chemical reaction process is as follows:

Removal of Iron

Divalent iron ions are oxidized to trivalent iron ions: 2Fe ² ⁺+Cl ₂ → 2Fe ³ ⁺+2Cl ⁻

Trivalent iron ions hydrolyze to form iron hydroxide precipitate: Fe ³ ⁺+3H ₂ O → Fe (OH) ∝↓+3H ⁺

Removal of Manganese

Divalent manganese ions are oxidized to tetravalent manganese ions: 2Mn ² ⁺+O ₂+2H ₂ O → 2MnO ₂ ↓+4H ⁺

In this process, manganese sand acts as a catalyst to accelerate the oxidation reaction of iron and manganese, while also playing a role in filtration and adsorption, trapping the generated hydroxide precipitate and other impurities in the filter layer, thereby achieving the national drinking water standard for iron and manganese content in the effluent.

Structural characteristics：

1. Tank body

The tank body of manganese sand filters is usually made of materials such as carbon steel and stainless steel, which have high strength and corrosion resistance. The shape of the tank body is generally cylindrical, with elliptical or spherical upper and lower heads to ensure the pressure bearing capacity and sealing performance of the tank body.

2. Filter material

The filter material of manganese sand filter is mainly natural manganese sand, with a manganese content generally above 25%. The particle size of manganese sand is selected according to different treatment water volume and water quality requirements, generally ranging from 0.5-2mm. Manganese sand filter material has a large specific surface area and porosity, which can provide good filtration and adsorption effects.

3. Water distribution system

The function of the water distribution system is to evenly distribute the water to be treated on the manganese sand filter layer to ensure the uniformity of the filtration effect. The water distribution system generally consists of an inlet, a water distributor, a water distribution pipe, etc. There are various forms of water distributors, such as porous plate water distributors, nozzle water distributors, etc.

4. Water collection system

The function of the water collection system is to collect filtered water and discharge it out of the filter. A water collection system generally consists of an outlet, a collector, a collection pipe, etc. There are various forms of water collectors, such as porous plate water collectors, filter head water collectors, etc.

5. Backwash system

The function of the backwash system is to backwash the manganese sand filter layer after a period of operation, in order to remove impurities and sediment from the filter layer and restore its filtration performance. The backwash system generally consists of backwash inlet, backwash pump, backwash valve, etc. There are various ways of backwashing, such as air-water backwashing, water backwashing, etc.

application area：

1. Drinking water treatment

Manganese sand filters have been widely used in drinking water treatment. It can effectively remove impurities such as iron and manganese from water, improve the quality of drinking water, and ensure people's physical health.

2. Industrial water treatment

In industrial water treatment, manganese sand filters can be used to remove impurities such as iron and manganese from water, preventing these impurities from causing corrosion and blockage to industrial production equipment and pipelines. For example, in the production processes of industries such as electronics, pharmaceuticals, and chemicals, the requirements for water quality are very high, and manganese sand filters are needed to ensure the quality of water used.

3. Sewage treatment

In sewage treatment, manganese sand filters can be used as advanced treatment equipment to remove heavy metal ions such as iron and manganese from sewage and improve the discharge standards of sewage.

FAQ:
1. Question: Are you a trading company or a manufacturer?
A:We are a professional manufacturer of all kinds of filter cartridges, housings, and filtration systems. We provide you with the total filtration solutions with our years of industry experience.
2. Question: Can we undertake EPC projects
A: Of course, we are a mature company in all aspects, and our aim is to provide one-stop services without any intermediate links.
3. Q: Can you make customized products?
A: Yes, of course, if you can provide us with detailed specifications or drawings. Our mission is to make customers ideas on the products and provide the customer satisfied solutions.
4. Question: Can you provide accessories for the corresponding equipment?
A: Yes, we have complete equipment and spare parts
5. Q: Can I use our own designed package?
A: Yes, size, color, logo, and packaging style all can be customized.
6.Q: What's your MOQ?
A: Normally, equipment 1 set. please feel free to contact us so that we can make some shipping recommendations for you to save the cost based on the quantity you need.
7.Q: I am a small business owner, Can I buy from you?
A: Yes, you are warmly welcomed. To grow with our customers is our goal. We would like to grow with you together.
8. Q: What is your general lead time?
A: For equipment normally 25-30 working days .
9. Question: How should I make the payment?
A: A: We strongly recommend T/T, L/C are acceptable.
10.Question: What services can you provide if there are after-sales problems with the equipment
A: Our dedicated personnel will solve all after-sales problems you encounter 24 hours a day

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