Continuous Sand Filter: Efficient Effluent Cleaning from China Suppliers and Factory
Product Description
The continuous sand filter is mainly composed of five parts: water filtration system, sand circulation system, compressed air system, sand washer, and monitoring and control system:
Water filtration system
Raw wastewater enters the sand bed from the water distributor through the water inlet pipe. The water is purified as it passes upward through the sand bed. After filtering, the clean water is discharged from the water outlet and enters the clean pool.
Sand circulation system
While the water flows upward, the sand bed continuously moves downward. Driven by compressed air, the dirty sand is lifted from the bottom of the sand bed through the sand lifting pipe to the sand washer and cleaned. of sand falls back to the top of the sand bed.
Compressed air system
Pass the air into the storage tank through the air compressor, and then pass it into the bottom of the sand lifting pipe. The mixture of dirty sand and water is pushed upward through the sand lifting pipe. Strong friction will push the dirty suspended solids upward. separated from the sand. Released at the top of the riser pipe, the dirty water is discharged.
Sand washer
At the top of the sand lifting pipe, the sand falls through the annular space of the sand washer and is cleaned by filtered water in the opposite direction to the falling direction of the sand. The flow of filtered water is driven by the liquid level difference between filtered clean water and sand washing water.
Monitoring and control system
The main control points are compressed air pressure, water inlet volume, sand circulation volume, etc. By equipping an online monitoring system, stable process operation goals can be achieved.
Frequently Asked Questions (FAQ)
How does a continuous sand filter purify wastewater?
Wastewater enters from the bottom distributor and flows upward through a moving sand bed. The sand retains suspended solids, allowing clean, filtered water to exit from the top outlet.
Why is the sand filtration process described as "continuous"?
It is continuous because filtration and sand washing occur simultaneously. The system does not need to be shut down for backwashing, as dirty sand is constantly removed, washed, and recycled back to the filter bed.
What role does compressed air play in the system?
Compressed air drives the sand circulation. It pushes the mixture of dirty sand and water upward through the sand lifting pipe, using friction to separate impurities from the sand grains before they reach the sand washer.
How is the dirty sand cleaned inside the sand washer?
Dirty sand falls through the sand washer's annular space and meets an upward flow of filtered clean water. This counter-current washing action, driven by liquid level differences, separates the dirt and discharges it as wash water.
What parameters does the monitoring and control system manage?
The monitoring and control system tracks crucial metrics including compressed air pressure, wastewater inlet volume, and sand circulation speed to guarantee stable, efficient, and long-term operation.