Wastewater treatment plants are important as normal water contains impurities that can be harmful to humans, animals, and the environment.
Media filtration is a mechanical process used by wastewater treatment plants in India. Both chemical and physical absorption processes are used here. The four crucial stages in media filtration are straining, sedimentation, interception, and diffusion. The last stage is inertial compaction.
The application of dual media filters is a good solution for contaminated water. It is considered to be excellent for the removal of turbidity, organic matter, and many other impurities. However, dissolved solids are partially removed by this process.
The dual media filter technology is used in various water treatment plants. Mainly, it is because of its effective construction and dual filtration procedure.
Water in a dual media filter passes through media with moderately smaller pores. Anthracite exudes out the largest molecules. Next layer removes particles with the help of adhesion and straining combination feature of sand and garnet. Filters do not block as fast as they do in a single filtration process. It is basically due to multiple depths or filters in dual media filter process.
An automatic back-washing technique is used in dual media filters that helps maintain unit efficiency.
Different Types of Dual Media Filters
Three most common, types of dual media filters are mentioned here:
-
Calcite Filters
Calcite is a compound that is naturally found in the environment. Therefore, it is cost effective. Calcite filters help to enhance the pH levels in water. They also neutralize water. Straining of pipes can be avoided because of this.
-
Anthracite Filters
This filter is used with sand in dual media filters. Its gravity is lighter than sand, and this feature makes it more suitable. Moreover, it can resist more chemicals as it has a high carbon content. It is considered one of the best options to remove suspended solids and turbidity. In biofilm treatment, anthracite is used as a carrier. It also helps in the growth of micro-flocks.
-
Activated Charcoal Filters
Charcoal, in other words carbon, is treated with oxygen. Small pores are opened between the carbon atoms resulting in absorption of impurities from liquid and gases.
Organic matters, chlorine, and disinfectants are removed from water with the help of activated charcoal filters. They are also known to enhance the taste of water. Using this process before any other filtration process such as reverse osmosis, saves oxidation.
Application of Dual Media Filters
Dual media filters are mostly applicable where water is contaminated with turbidity, iron, suspended solids, etc. They are one of the most effective ways to remove impurities under various conditions.
Common uses of dual media filters are in these filtration processes:
- Drinking Water Treatment
- Removes
Iron
Manganese
Turbidity
Suspended solid
Arsenic
Fluoride
- Pre-treatment in the RO process
- Pre-treatment in the desalination process
- Swimming Pool Water Treatment
- Removes
Turbidity
Suspended solids
- Wastewater Treatment
- Removes
Septic tank expansion
Turbidity
Suspended solid
- Ground Water Treatment
- Removes
Iron
Manganese
Arsenic
Suspended solid
Turbidity
- Process Water Treatment
- Removes
Turbidity
Suspended solid
- Used in a full stream filter
- Used in a side-stream filter
Features of Dual Media Filters
- Simple design
- Multi-layer filters
- 20-30 micron filtration rating
- Standard and persuasive quartz sand media
- Air cleaning for high-flow pressure vessel
- Low pressure drop across the vessel
- Vessels like MSRL, SS, DRP, and MSEP
- Manual, semi-automatic, and automatic features
- For safety, structural steel legs are designed which provide strong support
- Takes care of occasional fluctuations in flow rate
- Filter cycles between backwashings are long
Benefits of Dual Media Filters
Dual filters are more efficient than the normal sand media filters in attracting a large number of particles present in water. This happens because of the many filter layers with different levels of pores.
Another difference noted when compared with the sand media filters is that dual media filters last longer. This is because of the complete utilization of the dual media filter bed. Some more benefits are mentioned below:
- Removes turbidity and TSS effectively
- High quality output
- Hand holes and two elliptical manholes
- High dirt removal capacity
- The filtration rate is high
- Easy operation
- Easy to maintain
- Easy to install
- Low installation cost
- Reliable and efficient
- Low energy requirement
- Minimal start-up time
- Loss of pressure is less
- Cost effective
Dual media filters are much more efficient in removing dirt as compared to pressure filters.
Discover the Power of Dual Media Filters for Your Water Treatment Needs. Get in Touch with Us Today!
FAQs
1. What is a dual media filter and how does it work?
A dual media filter is a water filtration system that uses two different types of media—typically coarse gravel or anthracite and fine sand—to remove suspended particles and impurities from water. The layered media allows for more efficient filtration and longer operational cycles.
2. What are the main benefits of using a dual media filter?
Dual media filters offer higher filtration efficiency, longer filter runs, reduced backwashing frequency, and improved water quality. They are ideal for both industrial and municipal water treatment applications.
3. How is a dual media filter different from a single media filter?
Unlike single media filters that use only one type of filtration media, dual media filters use two layers, which enables better particle separation and improved filtration depth, leading to more effective removal of contaminants.
4. In which industries are dual media filters commonly used?
Dual media filters are widely used in industries like power generation, chemical processing, pharmaceuticals, food and beverage, and municipal water treatment facilities.
5. Can dual media filters be used for drinking water treatment?
Yes, dual media filters are suitable for drinking water treatment. They effectively remove turbidity and suspended solids, making the water clearer and safer for consumption.
6. How often should a dual media filter be backwashed?
The frequency of backwashing a dual media filter depends on the water quality and system load. Typically, it ranges from every few days to once a week to maintain optimal performance.
7. What is the typical lifespan of a dual media filter system?
With proper maintenance, the media in a dual media filter can last 3 to 5 years, and the system itself can function efficiently for over a decade, making it a cost-effective water filtration solution.
8. How do I choose the right dual media filter for my application?
Selecting the right dual media filter involves considering factors such as flow rate, inlet water quality, required output quality, and available space. Consulting a water treatment expert ensures the best fit for your specific needs.
Upgrade Your Water Treatment System Today!
Cleantech Water is a leading manufacturer of wastewater treatment plants in India. We supply domestic and industrial water treatment plants as per client requirements. We also provide underground sewage treatment plants to facilitate the safe disposal of water.
For more information about our wide range of products, please call us on +91-9099915539.