Turn slurry and digestate into high-value fertiliser and reusable water
Advanced evaporators for slurry and digestate treatment
We help biogas plants and livestock farms turn slurry and digestate into reusable process water and a mineral fertiliser (ASL).
Feel free to reach out, we'd be glad to get to know you and your project.
What does MKR Cleanwater do?
We build evaporators for digestate and slurry, mainly for food waste and residue AD plants: thermal vacuum evaporators (DV) running on waste heat and electric MVR evaporators operating at atmospheric pressure. The evaporator takes water out of the liquid digestate, so there is less volume to store, haul and spread. It recovers the nitrogen as ammonium sulphate solution (ASL), a mineral fertiliser, and leaves a nutrient concentrate. The distillate can be reused on site as process water. Reduce. Recover. Reuse.
Where waste heat is available, the thermal DV series uses it several times over, so little heat goes a long way. Where there is none, the electric MVR series runs on power alone. Volume reduction is around two thirds with the DV series and up to 90 % with MVR on thin liquid fractions up to 2.2 % DS. Our evaporators are built in Bavaria and serviced worldwide.
Two technologies, one goal
For digestate from food waste fermentation with available waste heat. One line treats up to approx. 100 m³ of feed per day, several lines run in parallel for larger plants. Around two thirds volume reduction.
For sites without waste heat. Powered by electricity, up to 90 % volume reduction on thin liquid fractions up to 2.2 % DS, Zero Liquid Discharge possible.
Which evaporator is right for me?
With usable waste heat, the thermal DV series; without it, the electric MVR series, or the DV series with a heat pump for thicker media. Try our evaporator calculator for a first recommendation in seconds.
Since 2009
Experience with digestate, manure and food waste facilities
Europe-wide
delivered (global service available)
up to 90%
Volume reduction (MVR, thin liquid fractions)
22.5 l/kWh
Distillate efficiency (MVR)
Why MKR for your project?
Because we deliver more than a machine: decades of evaporator know-how, build quality and automation, energy efficiency, nutrient recovery, full project support and long-term service, proven before you invest.
Test before you invest: laboratory test, in-house trial or on-site operation with the MKR test unit
Engineering & quality
Built to last, down to the last detail.
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Stainless steel for all media-contacting parts
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Acid & ASL handling entirely in corrosion-resistant plastic
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Premium components from leading manufacturers
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Precise in-house manufacturing & pre-assembly
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Flexible, modular, expandable design with excellent accessibility
Automation & low-maintenance operation
Runs reliably, cleans itself, needs little attention.
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Automatic CIP cleaning with acid & alkaline cycles
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Automated sensor flushing during operation, even with challenging media
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Low maintenance: no moving parts such as brushes in the digestate
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Quick heat-up and fast response to temperature changes
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Complete control solution: cabinet design, build & control programming
Energy efficiency & economics
Top efficiency, low operating costs.
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Best thermal efficiency: design value 4.3 l distillate per kWh thermal (4-stage), adapts to available heat (65 to 85 °C)
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Around two thirds volume reduction (DV, thermal), up to 90 % on thin liquid fractions up to 2.2 % DS (MVR, electric)
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Low operating costs: from €5.50 per m³ feed (DV), from €8 per m³ feed (MVR)
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Scalable to over 150,000 m³ of feed per year: one DV4000 line up to approx. 100 m³ per day, one MVR module up to 4 m³ per hour, several lines or modules in parallel.
Nutrient recovery & water reuse
Three valuable products instead of disposal.
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Ammonium sulphate solution (ASL) in mineral-fertiliser quality, pH 5.5 to 6.5, no mixing of acid & digestate
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Low-ammonium distillate for reuse as process water or recirculate; discharge only after site-specific finishing
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Nutrient-rich concentrate returned to the plant
Service & project support
With you from first inquiry to long-term operation.
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Framework concept and budget offer first, then trial evaporation in our own laboratory before you invest
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Forward-thinking project planning incl. economic evaluation
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Expert-led implementation, including the documents you need as annexes for your permit application
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Fast, on-schedule on-site assembly (preassembled delivery)
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Service & maintenance contracts incl. spare-parts management