CENTRIFUGAL PRESS ALDEC

Applications:
The ALDEC range of decanter centrifuges was developed with a focus on cost-efficiency, reliability and easy operation. The ALDEC design is used for sludge dewatering in a wide range
of industrial wastewater treatment applications, as well as municipal wastewater treatment plants.
 

Ideal for both small and medium-capacity installations:
ALDEC decanter centrifuges are designed to be efficient, simple to install, easy to maintain and straightforward to operate. Installation, operating and service life costs are minimal.

The ALDEC range features
• fully enclosed process sections
• critical parts made of wear-resistant material
• high performance combined with low energy consumption.
 

Benefits:
The ALDEC decanter centrifuge design provides a series of concrete benefits
• reduces sludge volume, which cuts down on transport and disposal costs
• continuous operation
• compact, modular design saves space
• low installed power reduces electricity consumption.
 

Working principle:
Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor (see drawing on page two). The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by an inlet distributor. The centrifugal force that results from the rotation then causes sedimentation
of the solids on the wall of the bowl.

The conveyor rotates in the same direction as the bowl, but slightly slower, thus moving the solids towards the conical end of the bowl. The cake leaves the bowl through the solids discharge
openings into the casing. Separation takes place throughout the entire length of the cylindrical part of the bowl, and the clarified liquid leaves the bowl by flowing over adjustable plate dams into the casing.

Design:
The rotating part of these decanter centrifuges is mounted on a compact, in-line frame, with main bearings at both ends. Vibration dampers are placed under the frame. The rotating part is enclosed in a casing with a cover and a bottom section with integrated outlets for both solids and the liquid being removed.
 

Drive system:
In all ALDEC decanter centrifuges, the bowl is driven by an electric motor and a V-belt transmission drive. Power is transferred to the conveyor via a planetary gearbox.

Operation can either be pre-set to a suitable set of parameters, or the difference between the speeds of the bowl and the conveyor can be controlled automatically, with no need for changing belts or pulleys.

Materials:
The bowl, conveyor, inlet tube, outlets, cover and other parts in direct contact with process media are all made of stainless steel. The discharge ports, conveyor flights and feed zone are protected with materials that are highly resistant to erosion. The frame is made of mild steel with an epoxy enamel finish.

Process optimization:
ALDEC decanter centrifuges can be adjusted to suit specific requirements by varying
• the bowl speed to obtain the G-force required for the most
  efficient separation
• the conveying speed for the most efficient balance
  between liquid clarity and solids dryness
• the pond depth in the bowl for the most efficient balance
  between liquid clarity and solids dryness
• the feed rate – ALDEC decanter centrifuges are designed
  to handle a wide range of different flow rates.

The Basic Core Controller:
Each decanter centrifuge in the ALDEC range equipped with
a variable frequency drive (VFD) as standard is delivered with the Basic Core Controller (BCC). This control package is capable of fully controlling the decanter operation, ensuring the most efficient performance and keeping costs for installation, commissioning, operation and maintenance to a minimum. The controller is also designed to measure the temperature of the bearings, and to monitor vibration levels.