Hydro launches Rotating Sludge Scraper

Feb 22, 2025

More in

Launched in the UK by Hydro International, the Zickert Rotating Sludge Scraper builds on the success of proven technology for rectangular tanks.

With 90% of sludge settlement tanks estimated to be circular in the UK, the innovative Zickert 3700 promises a widespread retrofitting opportunity for new installations. It achieves the same lower-energy and high-sludge performance of rectangular Zickert scrapers and is suitable for primary, humus and final settlement tanks.

The Zickert 3700 features an peripheral drive and rotating scraper design. The electrical drive is located on the perimeter tank wall with a static electrical connection point meaning no sliprings are needed. The bottom scraper blades of the new Zickert 3700 are rotated via a circular ladder rail inside the tank wall, moving settled sludge to the collection point.

Where surface scum has to be skimmed off, the scraper frame is equipped with an additional top blade which directs scum to a scum beach and trough on the tank perimeter. With few moving parts, the complete Zickert 3700 installation is easy and inexpensive to maintain.

By removing the need for a bridge, a lower profile design is achieved which reduces the space under odour control covers, so there is less air to be purified.

The scraper section is supported by its own wheels, therefore allowing the drive ring and central support to hold the scraper in position without additional stresses. There is no fixed rail above the tank rim making concrete construction easier and only the motor/gearbox protruding above the tank wall so that low profile covers can be easily deployed.