Continuous sand filter, Self-wash flushing sand filter, Continuous sand filter tank
Continuous deep bed backwash upflow volume sand filter
Continuous steel sand tank filter
active sand filter
Sandflo filter
Function:
Trap organics, suspended solid, colloidal solid in water.
Remove nitrogen and phosphorus
Reduce COD(Chemical Oxygen Demand) in water
The Continuous sand filter is an up-flow, moving bed filter that is constructed with various media depths for different applications and configurations.
How it Works:
Raw water enters near the bottom of the tank by means of a stainless steel water distributor. Suspended solids are filtered out as the raw water flows up through the media bed. As the filtrate reaches the top of the filter, it passes over the effluent weir and is discharged. A portion of the filtrate is diverted through the sand washer and used for cleaning and transferring the waste solids.
The Continuous sand filter employs a backwash rinse that is performed continually while the tank is processing water. An air lift pump, located at the center of the module, draws the media from the bottom of the filter up into the wash box. As the media is released into the wash box, it falls into the sand scrubber where the filtered solids are separated from the sand. From there, the filtrate carries the solids out as waste (backwash). The washed sand falls down onto the media bed for continued use.
Features
Automatically backwashes while filtering for continuous operation.
High filtrate rates in a small footprint.
Controls consist of a level transmitter, modulating effluent valve, air control panel and a filtrate weir.
Low space requirements and ease of installation.
No moving parts and simple, effective operation.
High efficient, 24 hours of continuous operation, no need stop to backwash.
Operation and maintenance cost is low.
The stainless steel internal equipment can be supplied for existing concrete cells.
Benefits
Effectively filters otherwise hard-to-filter solids.
Saves energy and maintenance costs.
Produces an uninterrupted treated water stream, with a minimal resultant waste stream for disposal or further treatment.
Applications
Continuous sand filter is widely used in many fields,especially for municipal wastewater, industrial process water, sewage and industrial waste water purification. It is a kind of continuous filter, combined flocculent, settling, filtering together. For tertiary filtration of reclaimed water, the gravity sand filter offers advanced treatment: efficiently remove organics, suspended solid, colloidal solid, nitrogen and phosphorus, COD(Chemical Oxygen Demand) in water.
The Continuous sand filter share a common sand bed. A plant can be designed for a virtually unlimited filter area, enabling the sand filter to be applied to small and large treatment plants with capacities ranging from 0.05 MGD to flow rates in excess of 100 MGD.
Automatic control manner: include electric control and Air control.
Electrical control cabinet:start up, operation,alarm and other functions.During normal operation, the electrical
control cabinet make it continuous flushing; when running abnormal, the warning signal will be transmitted to the control box, then the program will be issued a directive to stop filtering.
Air control cabinet: control the compressed air passing through the solenoid valve and feed into the air flow
meter. The pressure switch is set to detect the inlet pressure of the solenoid valve, so that when the compressed air pressure is lower than the set value, the pressure switch and the alarm starts, while stopping the supply of compressed air. Further, when the pressure control valve or solenoid valve fails, itwill alarm and stop the supply of compressed air.
