Overview
Dual media filter is equipped internally with an inlet distributor and a collecting system at the bottom. The system is externally fitted with frontal pipe work and isolation valves. To remove the suspended particles, sand is used. We use anthracite to make the water suitable for various uses. They also help in extracting odor and color, etc. Gravel and pebbles are offered to support all media. The sand-anthracite filter will occasionally backwash, which affects the flow of water through the sand-anthracite filter.
The anthracite filters out the largest particles during the filtration process. Then, through a combination of adhesion and pressure, the sand traps the rest of the particulate matter. As the water particles are filtered out at varying depths in a dual media filter, the filter does not clog as quickly as all the particles have been captured by the top layer.
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What are dual media filters?
Dual media filter includes anthracite with marbled and gravel-reinforced fine sand. These filters consist of an anthracite film (1.25-2.5 mm) resting on a fine sand layer (1-1.5mm). Anthracite is coarse and, when we compare them to fine sand, they has more dirt-holding ability. We use dual media in locations where suspended contaminants, turbidity, and iron are present in the raw water. Under conditions of high filtering system volumes, dual media filters also provide very effective particle removal. As a filter medium, these filters use layers of anthracite and garnet pollutants with a filter system quantity of 98 percent down to 2 microns. In order to preserve unit efficiency, the dual media filters use an automated backwashing mechanism that uses a variety of air and water.
This grading of the filter media allows the sand anthracite filter to run for longer periods until it require a backwash. There are two main sections of a sand anthracite filter or multi-media filter:
- A multi-port Valve Composite Pressure Tank.
- Graded sand and anthracite beds.
What are the different types of dual media filters?
Normal water contains impurities that are harmful to living organisms, So water treatment plants are essential. Media filtration is one type of mechanical process used by wastewater treatment plants. Chemical and physical absorption approaches are also used here. Straining, sedimentation, interception, and diffusion are the four critical phases of media filtration. Inertial compression is the last step. For polluted water, the use of dual media filters is a successful option. It is considered to be excellent for the removal of impurities. Most of the dissolved solids are removed by this process. We use dual media filter system In different water treatment plants. This is mainly due to its efficient design and dual filtration process.
With moderately smaller pores, water moves through media in a dual media filter. Anthracite releases the main molecules. Using the adhesion and straining combination feature of sand and garnet, the next layer removes particles. In a single step of filtration, filters do not obstruct as quickly as they do. When coming to dual media filter method, this is essentially due to multiple depths or filters. In dual media filters, it uses an automated backwashing technique that helps preserve unit efficiency.
The three most common type of dual media filters are:
- Calcite filters: Calcite is a substance that is present in the atmosphere naturally. It is also cost-efficient. Calcite filters help to increase the water’s pH levels. They neutralize the water too. Because of this, the straining of pipes can be stopped.
- Anthracite filters: In the dual media filters,we use this filter with sand. It is lighter than sand by gravity, and this feature makes it more suitable. Moreover, as it has a high carbon content, it can withstand more chemicals. It is one of the easiest ways to reduce suspended solids and turbidity. We use anthracite as a medium in biofilm treatment. This also assists in the creation of micro-flocks.
- Activated charcoal filters: With the help of activated charcoal filters,we can remove organic matters like chlorine and disinfectants from the water. Moreover, we use them to improve the taste of water, too. Using this process saves oxidation before any other filtration process, such as reverse osmosis.
What are the applications and features of dual media filters?
Applications:
- Sidestream filtration of cooling water.
- Filtered water treatment.
- Wastewater treatment.
- Boiler feed water.
- In the pre-treatment of the RO process.
- In the pre-treatment of the desalination process.
- Removes turbidity and also suspended solids.
Features:
- Simple design.
- Multi-layer filters.
- Structural steel legs, which also provide reliable protection. This can improve safety.
- Takes account of regular flow rate fluctuations.
- High Performance of Filtration.
- Filter up to 10 -20 microns.
- FRP, MSRL, MSEP & SS Vessel are also available.
- Standard and effective sand- anthracite media.
- Across the vessel, low pressure drops.
- Air scouring for vessels with high flow pressure.
- There are manual, semi-automatic, and automatic features.
Benefits of Dual media filters
In attracting large amounts of particles present in water, dual filters are more effective than standard sand media filters. This occurs due to the multiple layers of filters with different pore levels. Compared with the sand media filters, another difference noted is that dual media filters last longer. This is because of the full use of the filter bed of the dual media. Below are some benefits:
- High-quality output.
- Strong potential for the dirt removal.
- High filtration rate.
- Easy operation and easy to maintain too.
- Easy to install and low installation cost.
- Cost-effective.
- Reliable and efficient.
- Loss of pressure is less.
Bottom Line
Dual Media Filter eliminates suspended solids, turbidity, and certain color and odour from wastewater. At Jateen Trading Co., we deliver filters, spares, media, pumps, digital meters etc that will help you filter your water in a highly effective manner. Are you looking for the best quality filters, then contact us! We are also supplying the best quality of filters, spares, media, pumps, digital meters etc for your filtration unit. It can be any type of RO, Softner, or DM.
