High requirements despite slow movement

Special environmental conditions for energy chain
The movable scraper at the primary clarifier, which travels on a gantry above the primary clarifier, takes several minutes each time to convey oils, fats and the settled sludge to the end of the basin, where all of it is pumped off and fed to the treatment plant. This means that the axes do not run every second. Despite the low speed, this is not a "low end" application for moving pipework, however. On the contrary: The energy supply system has to function all year round outdoors in 24/7 operation - in frost, strong sunlight, in corrosive, sometimes aggressive environments and with minimal maintenance.

Installation on the inside of the basin - trouble-free operation
This, as well as the price-performance ratio, convinced the operator of the sewage treatment plant in Plauen, so that nothing stood in the way of the installation. A number of special features were taken into account in the offer. For example, the primary clarifier at the Plauen plant is relatively long at almost 60m, and the movable energy supply system had to be installed on the inside of the basin. Corrosion resistance is therefore extremely important here, as is operation that is as free from maintenance and wear as possible: the basic flizz is not accessible without draining the basin.

The new system was installed in summer 2013 and has been running smoothly ever since. Says Schubert: "No problems have occurred. With the motorised cable reel, we would certainly have had at least one more accident."