The AquaDecanter-R rotary decanter is one of the most successful and reliable products in the range of wastewater treatment equipment available from Aquatec Maxcon Pty Ltd.
During the settlement period of an intermittent aeration wastewater treatment process, activated sludge settles to the tank bottom, leaving clear treated supernatant on the top. The treated supernatant can be removed effectively with minimal carry-over of solids by the decanter without disturbing the sludge blanket at the bottom of the tank. The rotary decanter consists of a decant trough, weir, floating scum buffer, carrier pipes, rotary collection pipe, submersible support bearings and a drive mechanism.
In operation, the drive mechanism extends and retracts a drive shaft which actuates an eccentric link arm that rotates the trough up or down in an arc into the supernatant. The trough, carrier and collection pipes are supported at both ends by submersible bearings. The bearings are secured inside bearing housings which are bolted to concrete plinths. The supernatant discharge rate can be controlled over the weir by variable speed control to maintain optimum flow. The floating scum baffles prevents scum from approaching the weir.
The decanter drive mechanism consists of an electric motor, gearbox, jack mechanism and screwed drive shaft. The drive is typically fitted with internally actuated position indicators that allow drive limits to be set for BWL, top park position and over limit safety stops. Optionally positioned transponders can also be fitted. The drive mechanism is normally installed at the end of the tank.
Structure and Operating Priciple
The rotary decanter consists of a decant trough, weir, floating scum buffer, carrier pipes, rotary collection pipe, submersible support bearings, drive and transmission mechanism.
The rotary collection pipe receives the supernant from the decant trough and is supported at both ends by submersible bearings. The bearings are secured inside bearing housings which are bolted to concrete plinths. The decant trough is connected to the rotary collection pipe by the carrier pipes and is raised and lowered by turning the rotary collection pipe.
The drive and transmission mechanism consist of an electric motor, gearbox and screwed drive shaft. The drive mechanism is normally installed at the end of the tank with the drive shaft connected to an eccentric link arm on the rotary collection pipe.
In operation, the drive mechanism extends and retracts the drive shaft and rotates the rotary collection pipe. The decant trough consequently moves up or down and supernant is collected for discharge from the tank.
The geared motor can be controlled by a variable frequency drive and hence vary the decanting the rate. Level switches are used to control the high water level, lower water level and decanter park position.
In addition to the level switches, a mechanical lock is also provided to prevent an overrun and mechanical damage to the decanter mechanism.
The AquaDecanter-R rotary decanter is particularly suitable for use in intermittent aeration processes such as:
Aquatec Maxcon has over 46 years’ experience in treating water and wastewater for both municipal and industrial applications. A leader of the water industry, Aquatec Maxcon has introduced a range of innovative process technologies to Australia including the first UASB, IC Reactor, Membrane Bioreactor and Circox Reactor. We have a successful track record in introducing new technologies, and have diligently supported their implementation within Australian conditions.
Aquatec Maxcon Pty Ltd is part of the Aquatec Maxcon Group which provides a complete vertically integrated range of in-house services including:
Aquatec Maxcon Pty Ltd can also provide different kinds of decanter to suit customers’ requirements.They are:
Aquatec Maxcon has established and maintains a dedicated service department for scheduled maintainence and breakdown services.