Belgian NPG Energy has requested German Weltec Biopower GmbH to set up a 2.4 MW biogas plant in the district of Limburg, that will generate 19 GWh of power and heat annually. The energy will be consumed by the Spin-group BV in its production facilities where special carpet yarns are manufactured in an energy intensive polymerisation process.
The heat generated will be utilised directly on site: The digestate will be extracted directly from the 2,000 m3 second-stage-digester in order to be dried with the entire heat produced by the plant. The dry fertiliser will then be sold to fruit and winegrowers across the border.
The use of the 50,000 t of substrate every year will also be efficient. Initially, most of the employed substances will consist of maize silage (about 20,000 t). However, the operator will gradually replace the maize with other renewable substrates and agricultural leftovers.
A highly efficient mix from grease separators and a pre-mixed, ready-to-use substrate will account for another major portion of the input. Apart from plant residue, this mix will also contain fats and vegetable waste. Additionally, the two bioreactors of a capacity of 4,700m3 each will be fed with soap water from biodiesel production and cereals prune.