Pre-thickening Function Improves Sludge Treatment Performance

This model has two thickening functions in the filter element and flocculation tank.

By separating water from sludge and thickening it before dewatering in the filter element, the treatment capacity of the dewatering section is increased.

Clog-free Self-cleaning Mechanism

The equipment has a filter element that consists of alternating layers of fixed rings and vertically moving rings maintaining a gap between them, and two screws are threaded through the filter element to transfer and compact the sludge.
A clog-free self-cleaning mechanism is achieved in which the moving ring is driven by the external rod to clean the filter element gap.
The amount of cleaning water for preventing clogging is very small compared to other types of dewatering machines.

Applicable to a Wide Range of Sludge Types without Blockage in the Cylinder

Each of the two screws rotates inward within the filter element to transfer sludge while the screw flights break up materials that easily cause clogging.
The machine is hard to be clogged even with sludge containing highly fibrous or inorganic materials, thereby providing a stable dewatering performance.

Long-life Design Significantly Reduces Replacement Parts Cost

The ring is driven by the external rod to prevent contact between consumable parts such as Moving Rings and Screws.
The life of consumable parts has been dramatically extended, resulting in a significant reduction in consumables costs compared to our previous models.
VOLUTE DUO™ can also maintain high dewatering performance for a long time.

Also Suitable for Sludge Dewatering in Chemical Precipitation Processes

Sludge generated through chemical precipitation processes tends to contain a high proportion of inorganic matter. Conventionally, filter press dewatering equipment has often been used because it provides high dewatering pressure.
With VOLUTE DUO™, filter washing and filter replacement are not required. Its energy-saving operation and water-saving design also help reduce running costs. While reducing the maintenance work and costs often associated with filter presses, VOLUTE DUO™ delivers stable dewatering performance.

Power and Water Saving

Power-saving Operation

The screw that rotates inside the filtration unit of VOLUTE DUO™ operates at an extremely low speed of approximately 2 to 4 rpm, resulting in very low power consumption and economical operation.
Under the same treatment capacity conditions, power consumption can be reduced by approximately 87% compared with a centrifuge and by approximately 70% compared with a filter press.

Water-saving Design

VOLUTE DUO™ employs a unique self-cleaning mechanism to prevent clogging in the filter element, thereby eliminating the use of large amounts of cleaning water for clogging prevention.
Compared to a belt press dewatering machine and a screw press dewatering machine, both with the same throughput, the amount of cleaning water is about 1/38 and about 1/4, respectively.

No Pre-thickening Required

This machine has an integrated structure in which two processes, thickening and dewatering, are handled by a single filter element, thus allowing the user to directly charge low-concentration sludge having a TS of about 0.5% without any pre-thickening stage.
This not only reduces the construction and operating costs for the thickening and storage systems but also reduces odor because fresh aerobic sludge is dewatered.
The machine can also efficiently capture phosphorus in waste activated sludge to the dewatered cake side, reducing the load caused by phosphorus returning to wastewater treatment.

Conventional Sludge Treatment Process

Aeration Tank Direct Dewatering

Easy Operation & Maintenance

24-hour fully automatic unmanned operation is possible with an automatic operation control using various sensors. There is no need for manual startups or shutdowns whilst operating the machine.
Additionally, there aren’t many daily maintenance items, and on top of that, there are no complicated operations required.
Furthermore, it does not require any special knowledge or skills, making it an easy-to-use product.

Process Flow