Hanshin Engineering has developed a ground-breaking underwater aerator and agitator known as the Aquarator®. Our so-called sister technology to the Aquarator® is Hanshin’s supernatant water discharger which is now even simpler and easier to use.
No Drive Power Required!! Saves on Maintenance Costs!!
Placed in a batch activated sludge process batch tank, this equipment discharges supernatant water (treated water) after the activated sludge has settled from the water surface. Since this equipment discharges supernatant water by gravity while floating on the water surface, it has the advantage of not requiring a drive unit for surface tracking.
The suction port (outlet) is lifted up above the water surface during the aeration process to prevent outflow of activated sludge mixture in the tank.
1.Easily adapts to fluctuating water levels due to its float-type mechanism
Always tracks the water surface even in changes to water level meaning no inadvertent discharge.
２.No need for drive power due to water surface tracking
By releasing the air lift valve into the atmosphere, it lowers down and discharges.
Discharge takes place when the device is lowered under its own weight. When stopping discharge, the device rises up due to its air lift mechanism and stops.
3.Simple structure for fewer failures
Since the discharger has no drive unit and few mechanical elements or sliding parts, it is unlikely to break down.
Batch Type Activated Sludge Process Flow
Shift away from traditional aerators
This equipment consists of the discharge unit and peripheral devices.
(2)S‐1 Air supply valve
(4)S-2 discharge valve
(5)Timer for control
(6)M‐1 Supernatant water discharge valve
(7)Supernatant water discharger
(9)S‐1 Air supply valve
(11)S-2 discharge valve
(12)Timer for control
(14)Supernatant water discharge valve
(15)Flow control valve
Operating flow example
Unit lifts up when air supply valve (S-1) is open at start of inflow. (Diagram D)
The unit is also in the lifted-up position in the aeration, agitation, and sedimentation process. (Diagram A)
Unit lowers down when discharge valve (S‐2) is open before sedimentation process is complete.
At this time, supernatant water flows into the discharge channel. (Diagram B)
Supernatant water is discharged when supernatant water discharge valve (M-1) is open during discharge process. (Diagram C)
(1)Aeration, agitation, and sedimentation process (lifted up)
(2)Sedimentation process (S‐1 closed, S‐2 open)
(4)Discharge complete / inflow process
The following peripherals are needed to operate the supernatant water discharger.
Products Used by
Local governments (local public organizations) and others