Continuous Sand Filter for Efficient Effluent Cleaning | China Suppliers & 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 the water filtration process work in a continuous sand filter?
Raw wastewater enters the sand bed through the water inlet pipe via the water distributor. As the water flows upward through the sand bed, it is purified. The filtered clean water is then discharged from the water outlet into the clean pool.
How is the dirty sand moved and cleaned within the system?
While water flows upward, the sand bed moves downward. Compressed air drives the dirty sand from the bottom of the bed up through the sand lifting pipe to the sand washer. After being cleaned, the sand falls back onto the top of the sand bed.
What role does the compressed air system play in sand filtration?
The compressed air system introduces air into the bottom of the sand lifting pipe from the storage tank. This pushes the mixture of dirty sand and water upward. The resulting strong friction separates suspended solids from the sand, allowing the dirty water to be discharged at the top.
How does the sand washer clean the sand without external water?
The sand washer utilizes filtered clean water flowing in the opposite direction of the falling sand. This counter-current flow is driven naturally by the liquid level difference between the filtered clean water and the sand washing water.
What parameters are managed by the monitoring and control system?
The monitoring and control system primarily manages key operational parameters, including the compressed air pressure, the water inlet volume, and the sand circulation volume, to ensure stable and continuous operation.