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The waste disposal company Entsorgungsbetriebe Lübeck has been operating a mechanical biological waste treatment plant since 2005. In this so called MBA, household waste is pretreated in such a way that the substances contained therein do not affect the environment, or at least as little as possible. Due to the separation of the recyclable raw materials, the collection of sand and the biological and mechanical preparation of the residual waste, the waste is reduced to such a degree that only a fifth of the original quantity must be disposed of. At the MBA Lübeck, 350 tonnes of household waste is treated in this way daily.
MBA Lübeck operates a wet fermentation process, where the waste separated from the metals, non-ferrous metals and sand is wet fermented in the fermenters. The advantage: Biogas is formed through the fermentation process, which provides electricity for the operation of the systems, via a combined heat and power station. The fermentation mixture is also called fine fraction. In spite of the name, it still contains all kinds of fractions such as rags, shards and plastics, as well as a high level of dry substances. In the past, this extremely abrasive medium with its many grinding contents continually led to problems with the pumps used. Plant foreman Matthias Benthien remembers: “The pumps were frequently clogged, theimpellers wore out quickly. The service life was only two to three months. In addition, the spare parts were very expensive.“
After a first contact, Herborner Pumpenfabrik provided the MBA Lübeck with a test pump from the UNIVERS-A series free of charge for six months, with special pump hydraulics for this pumping media. “In the case of special or even new applications for us, we provide a test pump from time to time,” said the responsible sales employee Henrik Schmeling. “After the test period the customers can decide whether they want to buy the pump or not. I have never experienced the latter.“ Benthien and his colleagues were also impressed by the pump, without reservations, which recommended itself for use due to the following characteristics:
- Due to its large grain sizes it is also reliable in operation with entwined contents in the medium
- Its large dimensioned wall thicknesses are resistant to abrasion for longer
- The abrasion resistance is further increased in the variant with the rubberised design
- A variable choice of impellers enables a medium-related selection of pump hydraulics
- The block construction makes the UNIVERS-A compact and low-maintenance
- Furthermore, the moderate spare parts prices guarantee low life cycle costs
Compared to previous pumps, the life span was multiplied. At the same time, the spare parts costs have been reduced by an unbeliev- able 80 %. Together, this has a very positive effect on the life cycle costs of the pump. The customer was so impressed with the pump that he now has eleven UNIVERS-A pumps in use. Furthermore, he also changed to Herborner Pumpen for another area of use: At the MBA Lübeck, five submersible pumps from the series UNIVERS-T have been installed, whose role is to pump water back into the system.
“The pumps facilitate our processes here a great deal,“ says Matthias Benthien. “They are low-maintenance and service-friendly. We can disassemble and assemble them ourselves without a great deal of ef- fort. In addition, the spare parts can be delivered quickly and have a good price-performance ratio. Personally, I also like it that the pumps can be set up vertically and horizontally.”