Tannery – Leather Factory

Wastewater Treatment

Year of Construction

05/2025

Project-Nb.

2025-10484

Country

Lower Saxony, Germany

Wastewater Volume

50,000 m³ per year

Organic Load

COD 4,000 mg/l

Energy Production

400 MWh per year

Solution

Anaerobic Wastewater Treatment

Scope of Supply

Planning, permitting, manufacturing/delivery, commissioning

Modules

Anaerobic Wastewater Treatment: AF-100.HC

Gas Storage 70 m³

Gas Treatment approx. 20 m³/h

CHP Unit

Heller-Leder GmbH & Co. KG in Hehlen is one of the few tanneries in Germany internationally renowned for its high-quality and sustainably produced leather. This family-owned company places great emphasis on craftsmanship, ecological responsibility, and innovative processes, making it a recognized specialist in the leather industry.

Since the existing in-house wastewater treatment plant was heavily overloaded and caused high operating costs, urgent action was required. In the first expansion stage, a module for anaerobic wastewater treatment was installed, supplemented by gas cleaning, gas storage, and the energetic utilization of the generated biogas in a combined heat and power (CHP) unit.

With this solution, Heller-Leder was able to significantly reduce its wastewater load, improve its cost structure, and at the same time generate renewable energy for its own needs – an important step in further strengthening its sustainability strategy.

Our Impact in Numbers

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Delivered Projects

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Ongoing Projects

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Energy Generated (TWh)

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CO₂ Reduction (tons)

Feedback

Urs Imlig

Appenzeller Milchspezialitäten AG

“The wastewater volumes kept increasing. FlexBio was able to provide us with a mobile pilot plant. After successful testing, the plant was quickly installed thanks to its modular design. And everything has been working very well and smoothly together.”

Alfred Oberlindober

CEO & Owner of the Private Brewery Schönram

“We are direct dischargers and, due to growth and the resulting increase in wastewater volumes, we reached the capacity limits of our existing treatment plant. In our search for a solution, we found FlexBio Technologie GmbH to be a competent partner. The cooperation has proven to be highly profitable. We particularly value the modular and flexible design, which can be expanded at any time.”

Josef Blüml

Halsbacher Qualitätsfleisch GmbH

“The compact container solution with drum screen, anaerobic stage, and MBR provides complete wastewater treatment. We are particularly pleased that we can reuse the treated water – this saves operating costs and is a real advantage for our environmental and sustainability goals.”

Ludger Seggering

Popp Feinkost GmbH

“Wastewater is full of energy. We were looking for a solution and found it with FlexBio – generating biogas from wastewater. We are satisfied with the installation of the plant. We are satisfied with the service. And we are satisfied with the results.”

Andreas Mehli

GRegio Energie AG

“FlexBio makes slurry valuable again! With the new farm biogas plant, FlexBio transforms slurry and organic waste into clean energy and high-quality natural fertilizer. In this way, sustainability becomes a real opportunity for agriculture – and the vision of paying for the tractor with slurry comes within reach.”

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