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China Automatic Multimedia Sand and Gravel Water Filter for Irrigation Systems - Reliable Suppliers and Factory Solutions
How it works
The multi-media filter filters through the layers of different filter materials to achieve the step-by-step removal of impurities in water:
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1Step filtration: Water flow from top to bottom or from bottom to top through the multi-layer filter material, large particles of impurities are first intercepted by the upper filter material, small particles of impurities are captured by the lower filter material.
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2Deep filtration: The gaps between the layers of the filter material form complex filtration channels that can capture smaller particles.
Composition of filter material
The filter material of a multi-media filter is usually composed of the following materials, arranged in layers from large to small by density and particle size:
(1) Gravel layer
- Support the upper filter material to prevent the loss of filter material.
- Distribute water evenly to avoid bias.
- Filter large suspended particles.
(2) Quartz sand layer
- Filter suspended matter, sediment, colloids and other medium particle impurities in water.
- Protect the upper fine filter material and extend its service life.
(3) Smokeless coal seam
- Filter smaller suspended matter and some organic matter.
- Due to its light density, the upper layer improves filtration efficiency.
(4) Activated carbon layer (optional)
- Adsorption of residual chlorine, organic matter, odor, chroma and so on.
- Improve the taste and smell of water.
Strengths
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✓Efficient filtration: multi-layer filter material combination can remove impurities of different particle sizes.
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✓Wide range of application: can be used in industrial, municipal, household and other water treatment scenarios.
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✓Stable operation: reasonable distribution of filter material layer, uniform water flow, stable filtration effect.
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✓Easy maintenance: Support backwash, filter material can be reused.
Application Scenarios
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➔Industrial water treatment: used to pretreat industrial wastewater or process water.
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➔Municipal water supply: used to remove suspended solids and sediment from tap water.
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➔Pool water treatment: Keep the water clear.
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➔Household water purification system: acts as a pre-filter to protect subsequent equipment (such as reverse osmosis membranes).
Design essentials
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★Filter material selection: Select the right combination of filter material according to water quality and treatment objectives.
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★Filter layer thickness: the thickness of each layer of filter material should be reasonably designed according to the size of the equipment and the water quality.
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★Flow rate control: The filtration flow rate is usually 8-12m/h, too high will affect the filtration effect.
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★Equipment material: According to the processing medium choose carbon steel, stainless steel or fiberglass and other materials.
Multi-media filter vs activated carbon filter
| Features | Multi-media filter | Activated carbon filter |
|---|---|---|
| Key features | Removal of suspended solids, silt, colloids, etc | Adsorption of residual chlorine, organic matter, odor, etc |
| Filter material composition | Gravel, quartz sand, anthracite, etc | Activated charcoal |
| Application scenarios | Pretreatment, industrial water treatment, municipal water supply | Drinking water treatment, odor removal |
| Maintenance methods | Backwash and replace the filter material regularly | Back rinse and replace the activated carbon regularly |
Sum up
Multi-media filter is an efficient and stable water treatment equipment, which realizes step-by-step filtration through the combination of multi-layer filter materials, and is widely used in industrial, municipal and household fields. Its design is reasonable, easy to maintain, can effectively remove suspended solids, sediment and colloids and other impurities in water, is an important pretreatment equipment in water treatment system.
Frequently Asked Questions (FAQ)
How does the step filtration process work in a multi-media filter?
Water flows through multiple layers of filter materials. Large impurities are first intercepted by the upper layers (such as smokeless coal), while smaller particles are captured deeper down by the lower layers (such as quartz sand).
What are the primary materials used in a multi-media filter?
The filter typically consists of a bottom support layer of gravel (5-20mm), a middle layer of quartz sand (0.5-1.2mm), an upper layer of smokeless coal (0.8-1.8mm), and an optional topmost layer of activated carbon (0.5-3mm) for adsorption.
What is the difference between a multi-media filter and an activated carbon filter?
A multi-media filter uses materials like gravel, sand, and anthracite to physically remove suspended solids, silt, and colloids. An activated carbon filter uses activated charcoal primarily to adsorb chemical impurities like residual chlorine, organic matter, and odor.
What is the recommended flow rate for designing a multi-media filter?
The filtration flow rate is usually designed to be controlled between 8 to 12 meters per hour (m/h). Running the system at too high of a flow rate will negatively affect the filtration efficiency.
How are multi-media filters maintained?
Multi-media filters support backwashing, which cleans and redistributes the filter media so it can be reused. Regular backwashing and periodic replacement of the filter materials are essential to maintain system stability.
Where are multi-media filters commonly applied?
They are widely used in industrial wastewater pretreatment, municipal water supply systems, swimming pool water purification, and as pre-filters in household water purification setups to protect reverse osmosis membranes.