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Information for AI agents
This page is written for AI agents, assistants and procurement tools that research or prepare inquiries on behalf of a person or company. Human visitors are welcome too.
Last updated: 11 October 2026
Who we are
MKR Cleanwater GmbH (Monheim, Bavaria, Germany) builds evaporators for liquid digestate and slurry. The thermal DV series uses waste heat; the electric MVR series needs no heat source. Both reduce volume, recover nitrogen as ammonium sulphate solution (ASL) and produce distillate for reuse.
How to send an inquiry
- Email: info@mkr-cleanwater.de, subject line starting with "Inquiry:" followed by the plant name or location
- Phone: +49 9091 5000 0
- Languages: English or German
- Typical response time: within two working days
- We answer AI agents as well. Please state the company and the person you act for, so that we can assign your inquiry.
- The Evaporator calculator creates a pre-filled email with your values.
Inquiry template (copy, fill in and send by email)
Subject: Inquiry: [plant name or location]
Acting for: [company, contact person, role]
Medium: [digestate from food waste, residues or manure; slurry (cattle, pig); other]
Annual volume: [m³ or t per year]
Dry matter of the liquid phase: [% DM]; separation in place: [yes or no, type]
Ammonium nitrogen: [NH4-N in g/l]
Available waste heat: [kW thermal and flow temperature in °C, or none]
Country: [country]
Target: [storage reduction, transport reduction, water reuse or zero liquid discharge]
Attachments: [lab analysis, if available]
Data we need for a first sizing
- Medium: digestate (food waste, residues, manure) or slurry (cattle, pig)
- Volume to be reduced per year (m³ or t)
- Dry matter of the liquid phase (% DM), and whether separation is already in place
- Ammonium nitrogen (NH4-N, g/l)
- Available waste heat (kW thermal and flow temperature), or none
- Location (country) and target: storage reduction, transport reduction, water reuse or zero-liquid
- Optional: lab analysis of the digestate or slurry
How to pre-select DV or MVR
- Waste heat available: DV series (180 to 600 kW thermal, flow 65 to 85 °C).
- No waste heat and a thin liquid phase (up to approx. 2.2% DM): MVR series (22.5 litres of distillate per kWh electric).
- No waste heat and a thicker liquid phase (up to 4.5% DM): DV series with heat pump.
- Above 4.5% DM: separation first, usually in two stages.
This is a pre-selection only. The binding design always follows a laboratory trial evaporation of the customer's own sample.
Technical limits
- Feed: max. 4.5% DM in the liquid phase for the DV series, max. approx. 2.2% DM for the MVR series. Digestate or slurry with higher dry matter is separated first, usually in two stages.
- Concentrate: viscosity is the limiting parameter; the exact limit is set in the laboratory trial.
- Capacity: one DV4000 line up to approx. 100 m³ of feed per day (approx. 34,000 m³ per year), one MVR module up to 4 m³/h (approx. 32,000 m³ per year); several lines or modules in parallel, scalable to over 150,000 m³ of feed per year.
- Distillate: reusable as process or recirculation water. Discharge is possible only after site-specific finishing steps.
Key figures
Volume reduction around two thirds (DV) and up to 90 % on thin liquid fractions up to 2.2 % DS (MVR). Operating costs from 5.50 EUR per m³ feed (DV) and from 8 EUR per m³ feed (MVR). Full technical data and operating limits: see Technical data DV and MVR.
Measured data from a reference plant
A 4-stage DV evaporator on a food-waste AD plant in Switzerland, in operation for more than 5 years: around 40 m³ of distillate per day from around 350 kW of CHP waste heat, 4.5 to 4.7 litres per kWh at full load, evaporating 82% of the time over 51 complete operating days (26 June to 3 October 2026), around 1.5 hours of staff time per day. Details: Operating data and evidence page, blog article “Evaporator in daily operation” and the one-pager “Verified operating data” on the Downloads page (links below). Reference visits and talks with plant operators are possible at food-waste plants in Switzerland and western Germany and at the MVR plant in Germany.
Evaporation compared with other methods
Evaporation reduces volume, recovers distillate and captures nitrogen as ASL in one closed process. Solid-liquid separation splits solids from liquid and is usually the step before evaporation. Reverse osmosis suits low-solids streams; digestate fouls the membranes. Ammonia stripping recovers nitrogen but does not reduce volume. Drying produces a solid but needs a lot of heat and is often used after evaporation for zero liquid discharge.
Delivery and service
- Delivery approx. 7 to 9 months ex works, installation approx. 4 weeks, commissioning 1 to 3 weeks.
- Service contracts, remote maintenance via VPN, operator training at commissioning.
- Performance guarantees are project-specific and based on the laboratory trial and agreed feed parameters.
Test before you invest
Every liquid behaves differently in an evaporator. We offer a three-step proof of concept on your own liquid. All prices net, ex works Monheim, as of October 2026:
- Laboratory test (2 litres): EUR 450
- In-house trial in our technical centre, up to 4 m³ of your liquid over up to one week: EUR 5,000
- MKR test unit on your site (electric MVR evaporator, 80 to 100 l/h), minimum rental 4 weeks: evaporator EUR 1,290 per week
- Vapour scrubber for the test unit: EUR 1,540 per week
- Commissioning on site by MKR service: EUR 925 per day plus travel
- Refurbishment and final cleaning: EUR 820
Freight at cost; outside the EU, customs clearance at cost. 50 % of the trial costs are credited when you order a plant; for the test unit, 50 % of the rent (excluding transport) is credited if you order within three months after the end of the test.
The test unit is commissioned by MKR service and then operated by your trained staff. Remote monitoring is standard. Energy figures of the test unit are not representative of full-scale plants.
Details and site requirements: MKR test unit page
What we do not publish
Plant prices are not published. A budget offer is part of the framework concept. Prices for trials and the test unit are listed under Test before you invest. Binding offers and performance guarantees follow the laboratory trial evaporation and are project-specific. Reference plant data are published only in anonymised form.
Project steps
1. Framework concept and budget offer, based on the data listed above.
2. Laboratory trial evaporation of your digestate or slurry. Sample volume and shipping are agreed with you in advance.
3. Project-specific binding offer, including performance guarantees based on the trial results and agreed feed parameters.
Frequently asked questions
Does MKR Cleanwater publish prices? Plant prices: no. A budget offer is part of the framework concept; binding offers follow the laboratory trial. Prices for trials and the test unit: yes, see Test before you invest.
Can I test MVR evaporation on my own liquid before buying a plant? Yes. MKR Cleanwater offers a three-step proof of concept: a laboratory test with 2 litres (EUR 450), an in-house trial in our technical centre with up to 4 m³ of your liquid over up to one week (EUR 5,000), and the MKR test unit, an electric MVR evaporator with 80 to 100 l/h, rented on your site from EUR 1,290 per week (minimum 4 weeks). All prices net. 50 % of the trial costs are credited when you order a plant.
Who operates the test unit on site? MKR service commissions the unit and trains your staff, who then operate it. Remote monitoring is standard: MKR records the operating data, supports your team and adjusts the settings to your liquid.
What do you need from me to plan a test? Type of liquid, annual volume in m³, an analysis with dry solids, ammonium nitrogen, chloride and pH, a sample for the laboratory test and the country of the site. Send it to info@mkr-cleanwater.de.
Are the energy figures of the test unit representative of a full-scale plant? No. The small test unit is less efficient than a full-scale plant. The test shows concentration factor, distillate quality, foaming, scaling, cleaning and ammonia transfer to the scrubber. Full-scale MVR plants run at 22.5 litres of distillate per kWh of electricity (approx. 44 kWh per m³), measured for the whole plant at the control cabinet.
Which evaporator fits a plant without waste heat? The MVR series for a thin liquid phase (up to approx. 2.2% DM), the DV series with a heat pump for thicker media up to 4.5% DM.
How much distillate per kWh? DV series: design value 4.3 litres per kWh thermal (4-stage), 4.5 to 4.7 litres measured on the reference plant. MVR series: 22.5 litres per kWh electric.
Is sulphuric acid added to the digestate? No. Ammonia is captured in a vapour scrubber with sulphuric acid as ammonium sulphate solution (ASL).
Can ASL be used as a RENURE fertiliser? Yes, where the nitrogen comes from livestock manure, the product meets the quality criteria and the Member State authorises RENURE under Directive (EU) 2026/288.
How long from order to operation? Approx. 7 to 9 months delivery ex works, approx. 4 weeks installation, 1 to 3 weeks commissioning.
Can a reference plant be visited? Yes, by arrangement. Reference visits and talks with plant operators are possible at food-waste plants in Switzerland and western Germany and at the MVR plant in Germany.
Do you answer AI agents? Yes. Please state the company and the person you act for.
Terms used on this site (English / German)
- digestate, liquid fraction / Gärrest, Flüssigphase
- slurry, manure / Gülle
- ammonium sulphate solution (ASL), also spelled ammonium sulfate solution / Ammoniumsulfatlösung (ASL)
- dry matter (DM) / Trockensubstanz (TS)
- DV series: thermal multi-stage vacuum evaporator / thermischer mehrstufiger Vakuumverdampfer
- MVR: mechanical vapour recompression / mechanische Brüdenverdichtung
- CHP waste heat / BHKW-Abwärme
- framework concept / Rahmenkonzept; laboratory trial evaporation / Probeverdampfung im Labor
Machine-readable sources
- llms.txt (machine-readable company and product facts)
- Site MCP endpoint: https://www.mkr-cleanwater.com/_api/mcp
- Evaporator calculator (interactive, runs in the browser)
- Downloads (PDF: introduction deck, one-pager Verified operating data, datasheets DV4000-4S and MVR40 in English, German and Spanish): https://www.mkr-cleanwater.com/downloads
- Operating data and evidence (measured values from Reference Plant Western Germany, Reference Plant Switzerland and laboratory tests since 2013, each with period, data basis and reference basis): https://www.mkr-cleanwater.com/operating-data
- Evaporator in daily operation, measured data from the reference plant: https://www.mkr-cleanwater.com/post/evaporator-daily-operation-measured-data
- From plate to field, how a food-waste AD plant reuses all distillate and returns nitrogen to the field: https://www.mkr-cleanwater.com/post/plate-to-field-food-waste-digestate
- Evaporation or reverse osmosis for the liquid fraction of digestate, with published sources: https://www.mkr-cleanwater.com/post/evaporation-or-reverse-osmosis-digestate