The favorable amino acid and fatty acid composition, the high protein content and the good digestibility make fish meal a high-quality feed (ingredient) for many animals. In the fish meals offered, fish species are used that are of little relevance for human consumption, e.g. fish rich in bones such as anchovies. During production and loading, impurities such as foil residues, metals and large bone fragments can hardly be avoided. To clean the product from these, J. Müller has relied for years on a VDK4 hammer mill with upstream cleaning system from Tietjen.
Due to its high protein content, fishmeal is used as a feed in fish feed and pet food production. The goal in fish meal cleaning and grinding is therefore to achieve an absolutely clean end product without disposing of the high-quality base product. In order to clean fish meal from sometimes occurring impurities, such as foil residues, metals and larger bone residues, J. Müller has been relying on a VDK4 hammer mill from Tietjen for years.
The seaport of Bremen is a recognized EU import port for maritime proteins. The terminal specializes in handling fish and krill meal and is the largest of its kind in Europe.
To ensure optimal fishmeal processing at the Bremen seaport, J. Müller Aktiengesellschaft approached Tietjen in June 2014 to provide a fishmeal cleaning and grinding plant for the Bremen port terminal.
Fishmeal from overseas has to be cleaned and re-milled before being added to feed due to contamination and clumping. Due to its special design, the Tietjen hammer mill VDK 4 is particularly suitable for grinding the fish meal. This was integrated into a complete cleaning and grinding plant for J. Müller. It extends over a total of two floors.
High-speed mill VDK – TIETJEN Verfahrenstechnik – Das Original (tietjen-original.com)
The special feature of this plant is the degree of purity of around 95% achieved. This is achieved by cleaning the fish meal via a drum screen and an air classifier. The drum screen used is particularly well suited for the continuous separation of foreign particles. The downstream air classifier separates the fish meal by means of an ascending air stream, which entrains the light foils and BigBag fibers as suspended particles. Fish meal sinks as “good product” and is fed to the hammer mill together with the “good product” of the trommel screen.
Fish meal has an explosive characteristic, which is why attention must also be paid to dust explosion protection. Tietjen solutions strictly follow the ATEX guidelines for dust explosion protection. The machines are explosion pressure shock resistant and flameproof up to an explosion overpressure of at least 0.4 bar. The machines, as well as the safety technology used, meet all the necessary national and international specifications. Thus, the explosion protection is complied with and the exhaust emission values are not exceeded. Our aim with this plant was also to implement an economical and at the same time very safe plant, which was specially tailored to the requirements of J. Müller.
Dust Explosion Protection
Since its start-up in 2015, the plant has delivered a throughput of 5 t/h and continuously ensures pure fish meal for the end customers.
Together with a partner from the dosing and washing machine technology industry, Tietjen has
created one of the ‘best’ processing plants for commercial biowaste in Berne – and the depackaging machine DRM 800 double-rotor separation mill is its centrepiece.
Wood pellets are a climate-neutral fuel derived from biomass. Ideally, pellets do not contain chemical binders and have a high energy density. Two kilograms of wood pellets are roughly equivalent to the efficiency of one litre of heating oil. Pellets are a good way to move away from dependence on fossil fuels. Tietjen’s hammer mills optimally crush wood for the pellet mill.
Along with solar, hydro and wind energy, biogas is a regenerative energy source that helps to save fossil fuels. It is obtained in biogas plants from organic material through microbial degradation. With IMPRASYN, Tietjen offers a process that breaks down fresh material down to the cell structure and thus significantly increases the yield of the raw material. A biogas plant in Lower Saxony has already been using a Tietjen mill for years to produce biogas and thus supply public and private buildings with heat.