Supernatant Water Discharger

Batch treatment of sludge is widely used in small- and medium-sized treatment plants. Two key pieces of equipment used for this treatment are aerators and supernatant water dischargers.Batch treatment of sludge is widely used in small- and medium-sized treatment plants. Two key pieces of equipment used for this treatment are aerators and supernatant water dischargers.

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!!

Supernatant Water Discharger

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.

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Features

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

Batch Type Activated Sludge Process Flow

Shift away from traditional aerators

This equipment consists of the discharge unit and peripheral devices.

Shift away from traditional aerators

(1)Air hose

(2)S‐1 Air supply valve

(3)Lift-up compressor

(4)S-2 discharge valve

(5)Timer for control

(6)M‐1 Supernatant water discharge valve

(7)Supernatant water discharger

(8)Air hose

(9)S‐1 Air supply valve

(10)Lift-up compressor

(11)S-2 discharge valve

(12)Timer for control

(13)Orifice

(14)Supernatant water discharge valve

(15)Flow control valve


Operating guidelines

Operating flow example

Equipment/Process Inflow Aeration and Agitation Sedimentation Discharge
Air supply valve
S‐1
Open Closed Closed Closed Closed
Discharge valve
S‐2
Closed Closed Closed Open Open
Supernatant water discharge valve
M‐1
Closed Closed Closed Open Closed
Operation diagram D A A B C

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)

Operation diagram

Shift away from traditional aerators

(1)Aeration, agitation, and sedimentation process (lifted up)

(2)Sedimentation process (S‐1 closed, S‐2 open)

(3)Discharge process

(4)Discharge complete / inflow process

Required peripherals

The following peripherals are needed to operate the supernatant water discharger.

Equipment Name Specification Example
Lift-up compressor Oilless compressor with pressure switch
(discharge pressure: 7kg/cm3, 0.4?0.75kW)
Air supply valve and discharge valve One each for air supply and discharge / air solenoid valve, aperture 20A
Supernatant water discharge valve Electric butterfly valve and electric ball valve
Air supply valve and discharge valve control timer 24 hour timer
Flow control valve (KF-100H and KF-200H models only) With indicator Partition valves, etc.

Products Used by

Local governments (local public organizations) and others

Product inquiries

HANSHIN ENGINEERING Co., Ltd.

2-26-7 Shikanjima, Konohana-ku, Osaka 554-0014, Japan
TEL:+81-6-6461-6551 FAX:+81-6-6461-6555
(Open weekdays 8:30 a.m. to 5:00 p.m. Closed weekends, national holidays, and company designated holidays)