Continuous Sand Filter for Efficient Effluent Cleaning - Quality China Suppliers & Factory Solutions
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
How does the continuous sand filter purify wastewater?
Raw wastewater enters the filter through the inlet pipe and moves upward through the sand bed. The sand bed acts as a filter medium, trapping impurities, and the purified clean water is then discharged from the top outlet.
How is the dirty filter sand cleaned and recycled?
The sand bed continuously moves downward. Compressed air pushes the dirty sand from the bottom up through the sand lifting pipe to the sand washer. The sand is washed by counter-current filtered water, and the clean sand falls back to the top of the sand bed.
What is the role of compressed air in the system?
Compressed air is introduced into the bottom of the sand lifting pipe. It creates the upward driving force that transports the mixture of dirty sand and water. The friction during this upward lift separates suspended solids from the sand particles.
Does the filtration process need to be stopped for backwashing?
No. Because the sand circulation and cleaning processes occur continuously and simultaneously with the filtration, there is no need to shut down or pause the system for backwashing.
What key parameters are managed by the monitoring and control system?
The monitoring system tracks critical parameters including compressed air pressure, water inlet volume, and sand circulation volume to ensure a stable, automated, and efficient process operation.