Case Studies

A waste water treatment plant was having serious problems with the build-up of clumps in their sludge. The choppers installed were not able to cut up the voluminous clumps in a passable size. This caused constant blockages in the rotary pumps which were supposed to keep the contents of the digestion tower circulating. The operator of the plant decided to try out a Boerger Rotorrake. The Rotorrake is a robust chopper. Blades and counter blades are mounted one after the other on the carrier shaft.

The Rotorrake was tested intensively for a long period of time. During that time, no problems occurred with the Rotorrake and no signs of wear could be detected on the blades or counter blades after the test phase.

Technical data

A contractor was looking for a pump and chopper for a new liquid manure tanker vehicle. The contractor wanted to use the tanker for collecting liquid manure at his customers to then spread on crops or deliver to biogas plants. The pump was needed for filling the tanker and for the subsequent spreading with a distribution system. To prevent any blockages from large solids in the distribution system, the contractor also wanted to install a solids chopper in front of the pump.

He opted for a Boerger EL 1550 and a Boerger Rotorrake 9000.  The compact, space-saving design of the Boerger machines stood out for the customer as well as the high quality and subsequent long service life of Boerger products. The contractor's main priority was to reduce the downtime of the tanker vehicle.

The customer is now extremely satisfied with the Boerger pump and Rotorrake combination. Thanks to the outstanding output of the Boerger pump, the long service life and the ease of maintenance due to the Boerger design, the productivity of the liquid manure tanker vehicle has significantly increased compared to the previous pump and chopping technology supplied by another manufacturer.

Technical data

A liquid manure organization was searching for a mobile vat filling station. Their priority was to have a mobile pump with chopper unit, as the medium often contained solids which could lead to blockages in the spreading device at a later stage when spraying the liquid manure. They also wanted to have a compact model.

The organization decided on a vat filling station from Börger. Besides the high performance rotary lobe pump and the efficient Börger Rotorrake, the customer was also extremely impressed with the service Börger offered. The customized unit was completely supplied by Börger GmbH according to all th erequirements of the customer.

The pump is operated via the PTO of a tractor. A low maintenance chain drive operates the Rotorrake via the second shaft of the rotary lobe pump. A slip clutch ensures maximum safety. The boom system installed above for filling the vats can be adjusted using the tractor hydraulics. This boom can be rotated manually up to 360°. The liquid manure organization is now highly satisfied with their customized filling station.

Technical data

At a two-stage biogas plant, staff were having increasing problems with blockages in an eccentric screw pump due to solids. The pump was installed between the main and secondary fermenter. Various silages are used within the plant (corn, millet, grass, rye) as well as dried chicken manure. 

The customer chose a Börger Rotorrake to reduce the solids. The Rotorrake was fitted on the suction side directly in front of the eccentric screw pump.  

The operator of the biogas plant is extremely pleased with the chopping yield. No more pump blockages occurred. The Börger Rotorrake's long service life and ease of maintenance continue to impress the customer. He is now considering using additional Börger products for the biogas plant.

Technical data