|Mechanical Biological waste treatment plant (MBA)
|Niederlehme, Brandenburg, Germany
|South Brandenburg Waste Association (SBAZV) and the Oder-Spree district (LOS)
|540 t/d household waste and 60 t/d household-type commercial waste
(1 line – 9 drying boxes)
|Production of secondary fuel (SBS)
The Südbrandenburgischer Abfallzweckverband and the Landkreis Oder-Spree decided to cooperate in the field of residual waste disposal due to innovations in the recycling laws. The Zweckverband Abfallbehandlung Nuthe-Spree (ZAB) was founded to implement the upcoming tasks.
The task of the ZAB was the construction and operation of a mechanical-biological waste treatment plant (MBT) for the treatment of household and bulky waste at the Niederlehme site in the district of Dahme-Spreewald in Brandenburg. A daily waste volume of approx. 600 tons was sheduled to be processed in the plant.
The plant should enable the production of a secondary fuel for subsequent energetic utilisation, the discharge of a inert fraction dumped to landfill as well as the discharge of metal fractions for reutilisation.
Within the invitation of a European public tender, the contract for the construction of the mechanical-biological treatment plant was awarded to a general contractor.
After the approval procedure has been carried out in the year 2004, the general contractor was able to begin construction of the MBT.
After a construction period of only 9 months, insolvency proceedings had to be initiated against the general contractor. After a prolonged interruption of construction work, a large part of the planning and supply services still outstanding was awarded to Waste Tec GmbH. The plant was then completed in between one year.
600 t/d of household and bulky waste is fed after recieving in a deep bunker to the waste treatment process by a fully automatic delivery crane. Bulky and commercial waste is unloaded into a flat bunker and, after pre-treatment, mixed with the remaining waste.
The waste treatment starts with a coarse pre-shredding of the household waste which will then be fed to a buffer bunker. The process crane, which is also fully automatic, feeds the pre-shredded waste into one of the nine drying boxes.
Biological drying reduces the input mass by approx. 30 %. In addition to moisture removal, biological mass is also degraded. Drying is essential for the subsequent efficient mechanical sorting and separation of the waste into mentoined fractions.
After the drying process, the waste is fed to the mechanical separation via process crane.
In the first step, the waste is separated into a “coarse” and a “fine” fraction and in further steps into a heavy fraction and a light fraction.
The metals separated in the mechanical treatment process will be recycled and inert materials needs to be deposited.
Combustible materials such as plastics, wood, paper, dried organic materials, etc., which account for approx. 50 percent by weight of the raw waste, are processed into soft and hard pellets. The substitute fuel will be loaded onto trucks via a loading press and fed to plants for energy recovery.
Secondary Fuel (SRF)