Photo: Agrogreen GmbH. All rights reserved.

Agrogreen’s technology produces a concentrate that requires about 70% less storage space than the original manure and digestate.

The concentrate saves money on storage, transportation and spreading.

The transparent liquid contains almost no phosphorus and is immediately and completely absorbed into the soil when applied.

No thermal hygienization is required for digestate due to a sterile filtration process.

And possibly most importantly, the concentrate emits no ammonia and no climate gases.

Photo: Agrogreen GmbH. All rights reserved.

better manure

Agrogreen’s proprietary technology stops climate gases and ammonia from the storage of manure and digestate, and it reduces climate gases from their application to fields.

By using the Agrogreen technology, more energy can be produced in existing biogas plants.

Agrogreen generates valuable new resources from manure and digestate. One of these resources is an ammonia fuel which is used directly as a carbon-free fuel or which can serve as a hydrogen source.

Agrogreen’s technology for processing manure and digestate is based on a pressureless osmosis that does not clog and only requires little energy. We have filed several patent applications.

  • Reliably stops methane, ammonia, and all other climate gases from the storage of manure and digestate.
  • Reduces methane emissions from the spreading of manure and digestate on fields.
  • Doubles the production of biogas from liquid manure.
  • Can remove nitrogen before the biogas process to prevent nitrogen inhibition in the main digester.
  • Generates valuable new resources.
  • Novel, previously untapped source of dischargeable water. The groundwater level will be thankful.
  • The system does not need to run 24/7 and can therefore be powered entirely by energy from photovoltaics.
  • Does not require polymers.


Agrogreen concentrate flows into soil

Ammonia gas

Unlike manure or fermentation residues, our transparent concentrate instantly and completely sinks into the soil, just like water. No ammonia emissions are produced.


Paragraph 6, sentence 1 of the German Fertiliser Ordinance (DüV) requires manure and digestate to be incorporated „without delay, but within four hours at the latest, and from 1 February 2025 within one hour of the start of application“ when spreading on fields. Working in manure and digestate takes time and requires expensive special machinery.


Sentence 3 allows for deviations: „The competent authority under Land law may, by way of derogation from sentences 1 and 2, authorise that the substances referred to in sentence 1 may be applied by means of other processes, provided that these other processes lead to comparably low ammonia emissions as the processes referred to in sentence 1“. Nothing should actually stand in the way of a permit not to have to incorporate the concentrate.

Biogas Plant with digestate strorage tanks


Our concentrate requires about 70% less storage space than the original manure or digestate. Farmers who use our system can save themselves money by not having to build additional manure and digestate storage facilities.


Paragraph 12 of the German manure ordinance DüV obliges farmers to store manure and digestate – due to water protection.


Sentence 2 requires farmers to „ensure that they can safely store at least the volume of manure or digestate produced in liquid form over a period of six months.“


Sentence 3 goes even further: from 1 January 2020, farmers who „do not have their own application areas must ensure that they can safely store at least the manure or digestate produced over a period of nine months if they use it on the farm or pass it on to others for fertilisation purposes.

Hygienisierungstank Agrogreen


Through the treatment with the Agrogreen system, the remaining concentrate is automatically sterile-filtered, which means that no additional hygienisation is necessary for this.


The German Biowaste Ordinance (BioAbfV) regulates how digestate must be treated before it can be spread on fields.


The hygienisation of the digestate can be carried out by means of various processes, for example pasteurisation or thermophilic fermentation or composting – all of which require high temperatures of 100 – 130 degrees Celsius. According to paragraph 3, sentence 6, number 4, other processes can in principle also be used for hygienisation: „in the case of other hygienising treatment via the process-specific parameters established in consultation with the competent authority.“ Paragraph 3, sentence 4 requires a process test on the effectiveness of the hygienisation procedure as well as „compliance with the maximum permissible limit values for pathogens, germinable seeds and plant parts capable of sprouting after the hygienising treatment on the material ready for delivery through tests of the hygienised biowaste.“ Only the separated solids may still have to be sterilised.

NRW Rote und gelbe Zonen


Due to treatment with the Agrogreen system, our concentrate contains almost no phosphorus, so in many cases it may even be applied in areas where water bodies are eutrophic.


The map above shows the red and yellow zones in North Rhine-Westphalia according to paragraph 13a of the German Manure Ordinance DüV and paragraph 38a of the Water Resources Act WHG. The red zones contain too much nitrate in the groundwater, which in principle allows 20% less liquid manure and digestate application.


In the yellow zones, there is too much phosphorus. If too much phosphorus is discharged into rivers and lakes, these ecosystems deteriorate and plants and fish are affected. Such waters are called „eutrophic“. In yellow zones, phosphorus may only be applied to a limited extent or not at all: Section 13a DüV, sentence 3, states that „only small amounts of phosphate may be used or the use of phosphate-based fertilisers should be prohibited“, which de facto amounts to a ban on the use of liquid manure and digestion residues, as phosphorus is one of its three main components.



So far, there is no legislation in the EU that addresses climate gases. This would change if the Green Deal is adopted.

The green transition is a top priority for Europe. EU member states want to reduce greenhouse gas emissions by 55% by 2030 compared to 1990 levels and become climate neutral by 2050. The staggered measures range from drastic emission reductions to investment in cutting-edge research and innovation, to preserving our natural environment. For the first time, the climate gases carbon dioxide, methane and nitrous oxide are to be severely restricted by law. For the time being, the Green Deal targets industry and large farms.

If the Green Deal is adopted, strong impacts are to be expected in agriculture, especially with regard to methane. Methane is 86x more harmful than carbon dioxide, and agriculture is considered the largest emitter of methane. The storage of manure and digestate alone is responsible for 15% of all methane emissions in Europe.


Our technology stops climate gases from manure and digestate already today. An investment in an Agrogreen system is therefore already prepared for future tightening of legislation.

„Cutting methane is the single most impactful way to prevent planetary warming in our lifetime.“


A Primer on Cutting Methane: The Best Strategy for Slowing Warming in the Decade to 2030; Institute for Governance & Sustainable Development (2023) 

Manure reduction of 70%

Agrogreen achieves a significant reduction in the volume of manure and digestate.. 

On average, 55% of the original volume of manure and digestate is converted into high-quality, dischargeable water.

Only about 30% of the original volume needs to be stored in the form of liquid manure concentrate. Storage and spreading of the manure concentrate is much simplified, as there is no release of greenhouse gases or ammonia after treatment by Agrogreen.

New resources from manure

dischargeable water

No competition to groundwater

Manure concentrate

No emissions of climate gases, only contains little phosphorus

Ammonia fuel

Further processing out of manure concentrate possible.

The Agrogreen advantages


Stops climate gases and ammonia from manure and digestate

Increasing biogas plant energy production

Generation of dischargeable water

Reduction of storage space requirements by 70 %

No civil engineering necessary

Production of an ammonia based fuel

Production of an NK fertiliser


Stops climate gases and ammonia from manure and digestate: YES

Increasing biogas plant energy production: YES

Generation of dischargeable water: YES

Reduction of storage space requirements by 85% : YES

No civil engineering necessary: YES

Production of an ammonia based fuel: YES

Production of an NK fertiliser: YES

Why the methane moment is now

Cutting methane emissions is the fastest opportunity we have to immediately slow the rate of global warming. It’s an opportunity we can’t afford to miss.

Methane has more than 80 times the warming power of carbon dioxide over the first 20 years after it reaches the atmosphere. Even though CO2 has a longer-lasting effect, methane sets the pace for warming in the near term. Methane concentrations in the atmosphere are currently rising faster than at any time since the 1980s.

For many years, methane was overlooked in the climate change conversation. But scientists and policymakers are increasingly recognizing that methane reductions are crucial.

Reducing methane emissions can help prevent potential climatic tipping points and reduce negative environmental impacts, especially in the Arctic.

Which means that now is the methane moment: Acting now to reduce methane emissions will have immediate benefits to the climate that reductions in carbon dioxide cannot provide on their own..


Source: Environmental Defense Fund

Agrogreen Manure Treatment

Video of our pilot plant

Duration: 1 Minute

Photo: Agrogreen GmbH. All rights reserved.


The effects of climate change, such as extreme weather conditions and temperature fluctuations, are causing soils to lose their water retention properties, resulting in increased water demand for agriculture. In addition, deteriorating soils also affect farmers‘ yields, which has a direct impact on our food security. The occurrence of more frequent and severe droughts can also significantly reduce groundwater reserves and impact crop yields.



Agrogreen’s technology, based on its Two-Stage Osmosis Treatment, is an ingenious solution to one of the biggest challenges facing agriculture in the coming years. The Two-Stage Osmosis Treatment process works by passing manure or digestate from biogas through a membrane that selectively allows only water molecules to pass – without any external pressure and therefore without clogging the filter. In this way, the clean water can be separated from the manure. This process not only provides a novel, previously untapped source of clean water, but also helps mitigate some of the environmental impacts associated with manure management and disposal.

This is because the process preserves the beneficial components of the manure, such as the nutrients, while allowing the capture of clean water that can be used for new purposes.



With the impact of climate change on agriculture, Agrogreen’s Two-Stage Osmosis Treatment offers an effective and efficient way to turn manure into clean water. It is also a cost-effective solution that can help farmers meet their increased water needs while reducing the environmental impact of manure disposal.

In times of systematic heat waves and water shortages, clean water is becoming increasingly precious not only for agriculture, but also for the groundwater and local natural ecosystems. Water produced from manure and digestate can be used for direct discharge into water bodies, for irrigation of fields, and even as drinking water for livestock. If grassland is also regularly irrigated and kept moist during the growing season, this has an additional positive effect on groundwater levels.


Two-Stage Osmosis Treatment

Photo: Agrogreen GmbH. All rights reserved.


A fouling-resistant, pressureless first osmosis reliably protects the subsequent reverse osmosis from fouling. This greatly reduces the need for cleaning and increases the service life of the membranes.


Agrogreen’s system cleans itself automatically and can be started and stopped at any time by simply switching it on and off. The system can be operated either continuously (24/7), or only during the day.


The energy requirement of our complete manure treatment, from the separator to the final polishing, is only approx. 15 – 20 kWh per ton of manure. If the plant is to run solely during the day, it can be operated entirely with solar energy.

How it works

The liquid manure, pretreated by means of a separator and fine filtration, flows through the first osmosis stage, where most of the water is removed from the manure by selectively passing only water molecules through a special membrane into a saline solution. The Agrogreen process ensures that the critical ingredients of the manure, i.e. nitrogen, phosphorus, potassium and the whole organics, cannot pass through the membrane and are gently discharged as a concentrate without the addition of any external pressure.

This reliably protects the downstream reverse osmosis unit from the organic matter contained in the manure and digestate, so that the reverse osmosis unit only has to perform the simple task of a desalination unit, which greatly increases its service life and durability. The optional following polisher step refines the effluent water to drinking water quality, which can be discharged or stored on site for further use.

The saline from the salt cycle is treated in the second osmosis stage to produce clean water and brine. The brine is continuously returned to the first osmosis stage, while water is continuously discharged from the second osmosis stage.

The complete nutrients of the manure and digestate are retained in the separated solids and in the concentrate. The entire process runs without the addition of polymers or flocculants. There is no thermal or chemical product change. The manure concentrate is a valuable fertilizer that continues to fall under any fertilizer laws and regulations and can be spread on arable land and grassland within such scope.


The concentrate has significantly improved storability compared to untreated manure, as the biodegradation of the single-phase, solids-free liquid is stopped thanks to the Agrogreen process.

 The stop of the biodegradation leads to a strongly reduced outgassing of the greenhouse gases methane and carbon dioxide, as well as of ammonia and hydrogen sulfide. Thus, the Agrogreen process can contribute to a sustainable reduction of CO2 emissions from agriculture.


The clear manure or digestate concentrate, which is easy to store and handle, can be applied to fields as a valuable liquid organic fertilizer in accordance with respective fertilization legislation.

Due to the strong reduction of liquid manure and fermentation residues in the form of the liquid manure concentrate, needs-based fertilization can be carried out much more easily and in a more targeted manner. For livestock-heavy and landless farms, the costs of disposal via commercial manure discharges are significantly reduced.


The high-quality effluent water from the Agrogreen manure treatment is no longer subject to regulations on manure, which means that no manure or digestate storage capacities are required for it. Only the concentrate is still subject to manure regulations and must be able to be stored. However, manure and digestate storage capacities are now only required for the much smaller amount of manure concentrate generated. In relation to the initial amount of manure arising, the amount of concentrate is reduced by approx. 70%.

Even with sharply increasing regulations for increased manure storage, the existing storage capacities on most farms should be sufficient to avoid the expensive construction of additional manure storage facilities when an Agrogreen plant is acquired.

For farmers and biogas plant operators who are confronted with the legally required increase of their storage capacities, the investment in a manure treatment plant from Agrogreen is doubly worthwhile, as they can save themselves the high costs of increasing the storage capacity.


In large, centralized manure processing plants, the concentrate can additionally be evaporated and dried as granules, creating a marketable organic fertilizer that is easy to store and transport. Large farms considering a possible thermal processing of their manure or digestate can save a lot of money and effort by installing an Agrogreen plant before the process.

Thanks to the pre-treatment of manure with the Agrogreen technology, the amount of manure to be evaporated is reduced by about 70 percent, since instead of all the manure, only the remaining concentrate needs to be evaporated and dried. Thermal processing of manure and digestate is such an energy-consuming process that pretreatment prior to thermal processing by means of an Agrogreen plant is worthwhile in any case.

While plants for manure and digestate evaporation have to be regularly cleaned, as the solids from the manure can cause blockages, manual cleaning of such thermal evaporators after pre-treatment by an Agrogreen plant is not necessary. In the concentrate from the Agrogreen process there are almost only dissolved solids, which are automatically removed by the addition of acid in the evaporation plants, which is a requirement anyway.

Our offer


Piloting and consulting

In-house testing, demonstrations, process design and engineering services.


Filtration technologies

Fine separator, microfiltration, Two-Stage Osmosis Treatment, nutrient concentration and clean water recovery.


Support and maintenance

Service plans for machines, inspection and maintenance, operator training

Dr. Dieter Mauer


PhD in astrophysics, founder and managing director of MionTec GmbH since 1998. MionTec is the European market leader for outsourced research and development with 25 employees. 10 patents in his name.

Customers (excerpt): Akzo Nobel, BASF, Bayer, BMW, Clariant, Daimler, E.ON, Evonik, Henkel, Hitachi Zosen, Linde, Merck, Remondis, Roche, RWE, Sanofi-Aventis, Solvey, Suez.

Peter Witt

Co-Founder / CEO

Practiced in tax consulting and auditing for 5 years. Subsequently founded WITT CONSULTING, which focuses on advising companies on adapting their business models from a sustainability perspective.

Advisor to medium-sized owner-managed companies, among others, for a Scandinavian recycler and a leading food manufacturer, which he supported in entering the Chinese market.

M. Eng. Sandra Lambertz


Apprenticeship at Siemens as an industrial mechanic. Subsequently studied mechanical engineering and completed a master’s degree in engineering sciences at the University of Applied Sciences Cologne. Since 2013 at MionTec first as engineer, since 2016 as co-managing director.

Specialist for water treatment with ion exchangers and adsorbers.

Joachim Alt

Dipl.-Ing. Process Engineering

Since 2004 at MionTec GmbH, initially focusing on ion exchange resins, since 2016 head of the membrane technology department. In charge of the development of the Agrogreen system.

Highly qualified process engineer specializing in environmental technology. Extensive experience in design and project management of ultrafiltration and membrane technologies for food, drinking water, foundry wastewater, drilling oil wastewater, natural gas condensate, municipal wastewater treatment plants, raw material recovery and substance purification.

Four years of Europe-wide construction supervision of ultrafiltration plants for the treatment of paint circuit water in a joint venture with Henkel AG.

Bastian Greisner

M. Sc. Process Engineering

Since 2020 process engineer at MionTec GmbH. Active participation in the development of the Agrogreen system.

Studied mechanical and process engineering at TH Köln, scholarship from DME Deutsche Meerwasserentsalzung e.V., winner of the AVEA Innovation Award 2017 for an outstanding thesis in the field of environmental protection. Currently doing his PhD at TU Dresden on the topic of simulation-based designs of osmosis processes. Also active as a guest lecturer for TH Köln and TU Dresden.

Selected research projects: Lithium extraction, seawater desalination, purification of sulfate contaminated groundwater, dewatering of liquid whey.

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We welcome the opportunity to hear from you.


Agrogreen GmbH
Kneinstraße 31
47807 Krefeld

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Monday to Friday: 09.00 – 17.00



+49 173 293 64 00

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    legal notice

    Agrogreen GmbH
    Kneinstrasse 31
    47807 Krefeld

    Phone: +49 173 293 64 00



    Represented by: Peter Witt, CEO

    Register office: Commercial Register B of the Krefeld District Court

    Registration number: HRB 19313

    VAT ID number: DE355965905

    Tax number: 117/5800/3402

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