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Shifting the conventional benchmarks for sludge dewatering performance. Compared with previous generations of equipment, they provide 2–3% drier sludge cake or as much as 30% greater capacity – or any combination in between.

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Decanter centrifuges play a crucial role in removing the water content from sludge from waste water plants, as well as from industrial waste streams. The drier the sludge, the smaller its volume and the lower its weight, both of which significantly reduce disposal and transport costs. 

Compared with even high-performance conventional equipment, the innovative design of ALDEC G2 decanter centrifuges provide the driest possible sludge cake at the lowest possible cost. The many technical breakthroughs keep life cycle costs to the absolute minimum, while power savings of up to 40% keep CO2 emissions down.

Dewatering of large volumes of sludge effectively requires consistently high torque and effective control. ALDEC G2 decanter centrifuges are the only design currently available that provides both, right across the whole range of throughput.

The ALDEC G2 is also the only sludge decanter designed for effective protection against the effects of abrasion. Special wear-resistant materials are used for all critical parts, resulting in low maintenance costs. This helps make ALDEC G2 solutions a solid long-term investment.

The unique drive system in the ALDEC G2 range makes it possible to vary the speeds of the bowl and the conveyor independently of each other. This ensures a perfect match with operating requirements as these vary over time and for each waste stream.

How it works

Optimized sludge dewatering

In the ALDEC G2 design, the separation of the liquid components from a stream of sludge takes place in a horizontal cylindrical bowl equipped with a screw conveyor. The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by an inlet rotor. The resulting centrifugal forces make the solids collect on the wall of the bowl. The conveyor and the bowl rotate in the same direction, but at different speeds, which has the effect of moving the solids towards the conical end of the bowl for removal.

Separation takes place along the entire length of the cylindrical part of the bowl, with the clarified liquid leaving the bowl by flowing over adjustable plate dams into the casing. The ALDEC G2 uses the hydraulic pressure inside the bowl to make sure that only the very driest fraction of the sludge cake leaves the bowl through the solids discharge openings. This results in supremely effective dewatering, with the driest possible cake.

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