Filtration through a layer or bed of grains is universally known, and is possibly the most efficient of all industrial treatment systems. It is commonly known as “Sand Filtration”, although these types of systems can involve any type of bed that is optimal for particle retention functions.
Filtration takes place when undissolved solids in water are retained in the holes between the grains of sand, across the entire filter layer. Depth filtration occurs, and this characteristic makes it the most effective of all filtration systems. A feature of this system is that it can withstand highly contaminated water. This filtering method can be used to trap small-sized organic and inorganic solids due to the effect of electrical forces created by friction between the dirt and the filtering bed itself.
Water should be made to flow through filter beds at low speed. Higher speeds erode channels in the filtering material, and the water is not filtered when it flows through these.
Collector arms or nozzles are installed at the base of the sand layer on a special structure to prevent the filtering sand from moving into the filtered water area. These components cover the entire surface of the bed, helping to ensure that water circulates uniformly and reducing load loss in the equipment.
Flocculation is used if the water to be treated contains a lot of dissolved substances or metal precipitates. This process binds together the particles in question to facilitate their retention in the bed. This strategy is used to prevent small particles from getting through the filter bed. Flocculation is carried out using complex chemicals known as polyelectrolytes.
All of our carbon steel parts undergo an internal and external procedure, involving base primer baths. Finally, they are then painted by electrostatic spraying, with epoxy polyester powder paint.
At Lama we are able to manufacture according to the ASME code.
Applications depending on the type of bed and water flow speed:
- Filtration prior to reverse osmosis
- Elimination of turbidity
- Fish farms
- Food industry (normally drinks – beverages)
- Effluent treatment…