What is the importance of sand filtration in STP?
Dissolved matter, floating, and sinkable particles are all removed via sand filtration. The effluent is vertically pumped via a fine layer of sand or gravel. By encapsulation or absorption, particles are removed from sewage treatment system. The filter needs to be rinsed if it is losing too much pressure.
Following that, filtered water travels in the other way through the filter bed. Together with the rinse water, the contaminated material is discharged and flows away. After that, filtration can start again.
Let’s understand the importance of sand filtration in sewage treatment plants or STPs!
The main purpose of sand filtration is to remove suspended particles. Depending on whether support aids are provided, the yield in this situation ranges from 50 to 99.99%.
The wastewater is additionally cleaned of suspended particles, COD, BOD, biologically bound nitrogen and phosphate, and undissolved metals.
The fundamental advantage of a sand filter is its straightforward design, which is frequently employed to produce significant yields. A sand filter can be used as a pre-treatment, side-stream filtration, and polishing filter at different stages of wastewater management. An effluent with the possibility for reuse is frequently produced by a sand filter.
Yet occasionally, it's necessary to add chemicals to increase the sand filter's output. For strongly laden wastewaters, a preliminary sedimentation stage is used to reduce the load on the filter. This aids in preventing frequent filter re-rinsing.
Functions of Sand Filter
Sand filter functions, namely surface filtration and depth filtration, determine the yield of a sand filter. The process of collecting the particles above the filter bed is known as surface filtering.
Together, these particles create a macro-porous lump that is highly effective, at attracting new particles. Smaller, harder-to-collect particles that are adsorbed to the sand particles are typically the focus of depth filtering. In contrast to dirt from depth filtration, dirt from surface filtration is simpler to get rid of during reverse rinsing.
Applications of Sand Filtration
When comprehensive removal of suspended debris from water or wastewater is necessary, sand filters are employed in a variety of industries and processes.
Sand filtration is used in the production of drinking water as well as in swimming pools, vehicle washes, groundwater treatment, slaughterhouses, the processing of fruits and vegetables, beverages, the food sector, metal surface treatment, producing chilled water, preparing drinking water, pre-filtering using membrane and active carbon systems, etc.
Advantages of sand filtration in STPs
1. Extremely efficient removal of turbidity from contaminated water.
2. High self-help compatibility and simplicity of design: minimal effort and basic knowledge are needed for construction, operation, and maintenance.
3. If built using simply gravity flow, no (electrical) pumps are necessary.
4. Construction can be done with local resources.
5. High dependability and resistance to changes in water quality.
6. There is no requirement for applying chemicals.
7. It is simple to design and operate, and it is simple to install in rural, semi-urban, and distant places.
8. Long life (expected to be >10 years).
Conclusion
With the information provided above, you might have understood the importance of sand filtration in sewage treatment plants. As a result, you may get in touch with Netsol Water for an effective sewage treatment plant, along with effective treatment methods.
The services we provide and how they can help you and your municipality can be explained by our experts. For further information, contact us at +91 9650608473 or enquiry@netsolwater.com