Project meeting of STEP at the site of the company ATS - Agro Trading & Solutions in Hardegsen (Photo: DBFZ)

Heat Power Biogas

Project ID 03KB147

SepaFlex - Co-Fermentation of Separated Biowaste Press Water in Sewage Treatment Plants for Flexible Energy Generation

Project SepaFlex - Icon to illustrate the project aim. Biogenic residues, wastewater treatment plant, compost, electricity, germling (source: DBFZ)


  • 01.09.2018 – 31.08.2021


University of Stuttgart
Institute for Sanitary Engineering, Water Quality and Solid Waste Management ISWS
Bandtäle 2
70569 Stuttgart

M.Sc. Claudia Maurer – project leader
Telephone: +49-(0)711 685-65407

Dipl.-Ing. Jingjing Huang – project coordination
Telepone: +49-(0)711 685-65477

Dipl.-Ing. Anna Fritzsche – further colleague
Telephone: +49-(0)711 685-65456

Universität Stuttgart
Institute of Energy Economics and Rational Energy Use
Heßbrühlstraße 49a
70565 Stuttgart Ludger Eltrop – project coordination
Telephone: +49-(0)711 685-87816

Dipl. Wirt.-Ing. Silvio Nagel – former colleague


03KB147B - Hauke-Erden GmbH (01.09.2018–01.07.2019)
03KB147C - BEM Umweltservice GmbH
  • Address:
  • BEM Umweltservice GmbH
    Teinacher Str. 34
    71634 Ludwigsburg
  • Contact:
  • Ralf Müller – project coordinator

Associated partners

Cooperation partners



Innovative process concept for efficient, demand-oriented production of biogas from organic waste by separate recovery of the separated liquid components from household biowaste in fermentation tanks of municipal sewage treatment plants


The aim of the project is to demonstrate a cost-effective process concept for the flexible energetic use of domestic biowaste together with sewage sludge. Biowaste press water (PW) is to be used in digestion towers of municipal sewage treatment plants for demand-oriented biogas production. At the same time the efficient use of the solid components of the biowaste (aBA) is to be maintained. The pilot project is intended to demonstrate the flexible adaption of biogas production to the company's own energy requirements and, possibly, to the electricity market.

Measures & Focus

University Stuttgart (ISWS)

Project coordination, project management, modeling and simulation, pilot operation, economic and ecological assessment

University Stuttgart (IER)

Assessment of the concept in the context of a sustainable energy supply by the analysis and evaluation of the effect, scenario calculations with sensitivities

Hauke Erden

Concept development, pilot operation, economic and ecological evaluation of the concept


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