Did you know that your livestock represents a considerable energetic potential that's just waiting there to be capitalized on? A potential, existing of electricity and heat, representing such an economic value that you should not ignore it? Our SLURRYTOENERGY bio-digesting solution, developed by our tech partner Bert Energie, will unlock this potential for you. Although this patented and meanwhile worldwide proven technology is well capable of converting all kinds of bio waste into considerable amounts of green energy without the use of energy crops (silage, root crops), it’s especially suited to process any livestock slurry.

Bert's anaerobic (absence of free oxygen) digesters apply the patented 'Power of Nature' (PON) mixing technology, which is based on the principle of communicating vessels. The left schematic shows that the downforce created by the expanding biogas (B) volume in compartment V2 pushes the digestate high up in V1 due to the open valve in V1. By closing the valve in V1 and releasing the biogas in V2 the digestate will flow back into V2, thus restoring the balance (center schematic). The principle is then applied in a reversed order (right schematic), and so on. No other biogas system is using this continuous natural process as consequently as does Bert!

The Bert technology is designed to have minimal moving parts and to require minimal operations (15-30 minutes per day depending on number of digesters) and maintenance. All components are standardized. Consequently structural service and maintenance are straightforward and easy to learn.

Integration of Bert technology in the farm slurry management allows additional savings: fresh slurry is fed continuously from the barn into the pre-pit. From the pre-pit the slurry is automatically and regularly fed into the biodigester. After the digesting took place the digestate is either poured automatically into the storage lagoon or fed into the our optional digestate treatment system.


The Bert product range not only offers conventional concrete build digesters coming in standardized tank sizes from 200-1500 m³ and equipped with the unique Bert technology. As of now we are proud to offer you as well the Bert Mobile series; same unique technology but as of now containerized for small scale farmers. A Bert Mobile becomes profitable as of 3 metric tons of slurry processed per day, whilst as of 9 tons of substrate per day conventional concrete build digesters can be more economic. Both products come with a CHP (Combined Heat and Power) unit, housed in a standard 20 feet container, that converses the biogas into free electricity and heat. The Bert kW/h output can be modified as per your requirements. This results in a winsome expenditure and attractive ROI. And with the optional DIGESTATE TREATMENT SYSTEM you get even more out of your slurry!


We offer a range of  different sized digesters in combination with a corresponding  CHP (Combined Heat and Power) unit. The typical combinations are: 300 m³ /30 kW, 400 m³/40 kW, 500 m³/50 kW and 600 m³/75 kW. Other combinations are conceivable, depending on your substrate. The combinations marked with an X are the most frequently sold in Europe. In case of larger substrate volumes, e.g. 30.000 m³ of substrate per year, 2 concrete build digesters can be combined.
By now over 100 Bert concrete build digesters, equipped with the unique Bert technology, have been commissioned. If you would like to know how this technology will be beneficiary to your farm too please read the following reference projects: PIG SLURRY and COW MANURE. Or visit our PROJECTS page for an overview of plants commissioned.


Bert Mobile is an industrial manufactured product using a limited number of standard parts only, resulting in savings on production costs. As a result of that there's already a Bert Mobile available for the price of a brand new tractor! But due to its simplicity there are more advantages; like ease of operation and maintenance, low maintenance costs and a quick and worry free installation and up-powering.

A major advantage of the Bert Mobile system is the ability to operate off grid, self sustainable generating sufficient electricity to run your farm and heat your barn or farm house.

This stand alone operation will result also in improved hygiene conditions and an effective disease control. And the odor free process leaves the environment unaffected.


• Configurations existing of 4 or more containers are available upon request.

• All pre-pit technology and post-digester units can come containerized.

• The CHP/kW per hour output of all Bert conventional and mobile systems depends on the substrate processed.

• The CHP also produces an equal amount of heat. Depending on the local climate a small part of this free heat will be used to ensure a constant and optimal digesting temperature inside the bio-digester.

• Final design/finish and technical specifications are subject to local conditions like climate zone, type of slurry and availability of materials.


1 Compartment 1

2 Agitator

3 Substrate flow throughput

4 Dividing wall

5 Compartment 2

6 Digestate outlet

7 Biogas storage baloon

8 Gas outlet pipe and valves (2x)

9 Manhole / hatch

10 Slurry inlet

11 Combined Heat and Power unit

12 Pre-pit/feeding pump (optional)


What is a Bert Mobile (BM)?

Bert Mobile is an industrially manufactured biogas plant consisting of a 40 feet bio-digester (BD) and a 20 feet technical container (TC). It’s a biogas plant that will be delivered by truck and is ready for biogas production within 4-6 days.

What is a containerized biogas plant?

Containerized means that the BD as well as TC are standard size containers. All parts of the biogas plant come prefabricated and delivered in a container, so that on site installation is limited.

What are the advantages of a BM?
  • industrial manufacturing offers reduced prices
  • using standard components assures quality
  • the mobility of BM allows relocation if needed
  • a BM is a modular system and can be expanded or down sized if required
  • DB is heated and can operate also at -30°C
  • starting from 3 tons of biomass per day
  • all kinds of biomass can be used
  • choices of CHP are available
  • various solutions for the use of biogas: electricity, heating, enclosed area cooling, refrigeration, CNG, deep freezing, burning, etc.
  • production of the fertilizer as output
  • no smell
  • easy to operate and low operation and maintenance cost
  • large variety of additional options like: heat pump, H2S sensors, web-control, flair, etc.
What substrates can be processed with a BM?

All animal (cattle, pigs, chicken, etc.) slurry/manure, as well as slaughterhouse waste, water treatment plant sludge, all food waste from food factories. In fact nearly all biomass.

How many (BD) containers do I need?

The number of containers depends on the daily biomass available. With 3 tons of biomass  per day or 10 cows you can start with the smallest system and upscale later on if required.

How much power does my biomass contain?

The power that the biomass is containing varies a lot. Compare it with the food you eat. Eating a steak and spaghetti will fill up your stomach (digester) and gives you energy for a long duration. Eating a watery soup with just 1 carrot in it won’t give you much energy. Usually dry matter content (DM) and organic dry matter content (ODM) are the key analytical data we need in order to define the biogas producing capacity of a substrate. Fats and sugars are excellent for biogas production.

How do I feed the biomass into the digester?

Depending on the biomass we offer various methods to feed the biomass into the digester (BD) on an hourly basis. For successful biogas production it is important that the biomass is presented to the bacteria in very small (digestible) portions. Therefore, shredders or other devices will be used to prepare the biomass.

What comes out of the digester?

The output of the digester is a wonderful bio fertilizer that can replace commercial fertilizer. This product is not smelling and has proven it’s effectivity many times all over the world.

Does it smell?

The biogas process is an anaerobic one. That means there is no smell from the process. The output of the digester does not smell either. If there is smell, it comes from the biomass which is waiting to be processed. That part needs to be managed properly.

What size of CHP do I need?

The required CHP’s (Combined Heat and Power) capacity depends on the power of your biomass. Please inform us regarding the amount of biomass you have available per day and we can calculate for you the capacity needed.

How often do I feed the digester?

The digester ideally should be fed on an hourly and timely basis: that means 24 times per day x 365 days.

What makes BM special, compared to competitors?

Bert systems are always working with heated digesters and a substrate temperature of around 40°C. In consequence a BM produces more biogas than other systems and at a constant rate. The heat comes from the CHP engine or from a heat pump.