A Borger Separator (strictly a Börger Separator in the German language) is a type of screw press separator, specifically the Börger Bioselect, which is used for the mechanical solid/liquid separation of materials like manure and digestate in agricultural and biogas applications.
This machine is in high demand for the separation process it provides, producing a stackable solid phase (used for bedding material or fertiliser) and a liquid phase (used for fertilisation). It does this in a simple, low-maintenance machine, reliably raising the value of the output from anaerobic digesters.
Press Release 4 Februry 2026:
Biogas Plant benefits from new Borger Separator
A new Separator made by Borger has helped provide a pig farmer with a more consistent feed for his biogas plant, as well as creating extra storage space, and a much easier to spread liquid.
When the pig manure enters the Borger Bioselect RC40 separator, it has a dry solids (DS) content of approximately 5%.
The farmer separates with a DS content of 22%, so that the stackable solid phase (which has a very high concentration of nutrients) is transferred to the biogas plant in large liquid quantities. The separated liquid phase spreads with ease, quickly penetrating the soil.
The Bioselect RC40 Separator (up to 40 m3/h) also ensures that there is far less contamination of sward.
Also available as a 25 m3/h, 75m3/h, 150 m3/h and now 250 m3/h, this small footprint Borger Separator can be utilised as either a stationary unit or for mobile use.
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Even if Borger (Börger) the specialist pump manufacturer wasn't one of our sponsors we still would continue to publish the following press release in this update as we think it is of interest to our readers to know when a company like Future Biogas (one of the largest biogas companies in the UK, which every year produces over 400GWh of biogas, and enough energy for over 40,000 homes) praises a supplier. That's exactly what the following press release is all about:
Press Release July 2020:
Twenty 20 for Borger’s pumps and separators with Future Biogas
A new order from Future Biogas is set to bring the total number of Borger pumps and separators at its AD/Biogas plants to over 20.
At the forefront of the anaerobic digestion industry, acclaimed AD developer and operator Future Biogas invested in its first Borger pump back in 2015 for its site near Swaffham – seeking an alternative solution to its existing pumps that were proving time-consuming and costly to maintain. Since then, the full-service company, which additionally provide construction, compliance and asset management, has also begun introducing Borger’s Bioselect RC Separators.
The latest Borger Separator, the sixth for Future Biogas, is heading for Doncaster. Designed with its drainage and press channels positioned one after the other in order to preserve the filter, the Separator’s rotating clearing auger does not come into contact with the screen. Abrasive parts cannot cause any damage to the surface area here, thus greatly increasing the service life of all components.
Neil Bushell, Head of Engineering at Future Biogas commented:
“The Borger Separators are excellent. We very much like the plug-sealing system, which takes away the risk of any liquid escaping. Since we bought our first unit in 2016, the reliability and superior performance have given us every confidence to order more”.
Converting a wide range of feedstocks into clean, renewable energy at 13 highly efficient AD plants, Future Biogas has gradually replaced pumps that caused issues with a large range from Borger, including the small AL-series (1.5 kW), right up to the 15 kW FL-series.
Neil Bushell added:
“Unlike the pumps we’ve been phasing out, we don’t have to spend anywhere near as much time or money on the Borger pumps. Just like the separators, they are reliable and very easy to work on with just basic tools. The mechanical seals never seem to fail. Spares are always readily available – and unlike before – at a sensible cost. And as a company, Borger are always there for us when we need help and advice”.
Borger UK: 01902 798977
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Frequently Asked Questions: Börger Bioselect
What is a Börger Separator?
The Börger Bioselect is a high-efficiency screw press separator designed for the mechanical solid/liquid separation of materials like manure and digestate. It is a key tool for agricultural and biogas applications to raise the value of anaerobic digester output.
How does the separation process benefit the farmer?
It creates two distinct, high-value phases:
- Solid Phase: Reaches approximately 22% dry solids (DS), making it stackable and easy to use for bedding or nutrient-rich fertiliser.
- Liquid Phase: Has a lower DS content (down from ~5%), making it easy to pump and spread while penetrating soil quickly to reduce sward contamination.
What sizes are available?
The Bioselect features a small footprint and is available in various capacities to fit stationary or mobile needs:
| Model | Throughput Capacity |
|---|---|
| Bioselect Small | 25 m³/h |
| Bioselect RC40 | 40 m³/h |
| Mid-Range | 75 m³/h – 150 m³/h |
| High-Capacity | 250 m³/h |
Is the machine difficult to maintain?
No. One of the primary reasons companies like Future Biogas utilize Börger is the ease of maintenance. The machines can be serviced with basic tools, the mechanical seals are highly reliable, and the auger does not contact the screen, which prevents damage to abrasive parts and extends the life of the filter.
“The reliability and superior performance have given us every confidence to order more… they are reliable and very easy to work on with just basic tools.”
— Neil Bushell, Head of Engineering at Future Biogas
[Published August 2020. Updated February 2026 with FAQs added.]
