Slurry Separators
In Denmark there is an increasing interest in slurry separators, as a consequence the technology behind them is progressing quickly. Today Denmark has 5-10 very different solutions that are generally classified as low or high-technological plants. Slurry separators can be combined with the degassing of slurry in a biogas plant.
The low-technological plants separate the slurry in a fibre fraction with a high content of phosphorus and organic tied nitrogen as well as in a liquid fraction, which primarily contains ammonium, nitrogen and potassium.
The high-technological plants separate the slurry in a fibre fraction with a high content of phosphorus and organic tied nitrogen, floating nutrient concentrates (NPK and N) and water.
In untreated slurry the ammonium nitrogen is compounded with organic tied nitrogen. The separation of nutrients in fractions in slurry separators, can be utilised during the fertilisation. Nitrogen in the liquid fraction has a very high utilisation. However, the utilisation of the fibre fraction is low. If the “clean” water is removed, a number of advantages besides the fertilising advantages is achieved, including savings on stocking, transport and spreading of the slurry. It is moreover possible to reduce the odour occurring during spreading of the slurry.
