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25.11.2019 Granulated fertiliser from sewage sludge ash

Glatt Ingenieurtechnik, Weimar, Germany, and Haldensleben-based Seraplant have jointly developed innovative technology to recover phosphorus from sewage sludge ashes and its residue-free conversion into standard phosphate fertilisers in accordance with the Fertiliser Ordinance. Glatt has been responsible for planning and implementation, from raw material supply — via suspension processing and subsequent fluidised bed granulation — to the finished fertiliser product.

Seraplant is investing €20 million in this innovative production facility at Haldensleben, the first of its type in Germany, with financial support from the state of Saxony-Anhalt and will create more than 20 new jobs. The plant is scheduled to come on stream in the fourth quarter of 2020. It is designed for an annual production of 60,000t of phosphate fertiliser, with end users expected to be conventional and organic agricultural businesses, agricultural and horticultural wholesalers as well as the fertiliser industry.

The entire process is completely waste-free. No potentially hazardous intermediate products, residues or exhaust gases are produced during the process. The project thus makes a significant contribution to the sustainable use of the vital resource: phosphorus. Although Germany has no natural phosphorus deposits, this process is now making indigenous resources available again, avoiding the need to import this coveted nutrient. Legislation will make the recovery of phosphorus from sewage sludge mandatory in the near future. As such, operators of large sewage treatment plants are looking for alternatives that enable these requirements to be met today.


Glatt’s 3D plan of Seraplant’s facility in Haldensleben which employs innovative phosphor recycling technology to produce phosphate fertilisers from sewage sludge ash

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