Approval procedure sewage sludge drying

The market for sewage sludge disposal is still undergoing legal changes. Possible disposal routes are becoming shorter, and rising acceptance prices provide the economic basis for alternative concepts. The idea of a sewage sludge recycling system that will be more environmentally friendly in the future was taken by the client as an opportunity to further develop initial project approaches on the site of a former porcelain factory into a rounded concept. In addition to the development of the concept, such plants also require the implementation of an immission control approval procedure.

Key data on the project

Bioenergy companie in the district of Wunsiedel

Company for drying sewage sludge with low-temperature heat from four wood gasification CHPs and a wood chip boiler

Industry sector

Energy production and waste recycling

Project location

District of Wunsiedel

Target group

Local authorities (waste management, waste recycling)


Biomass, pellets, sewage sludge drying, combined heat and power generation, process heat from bioenergy, wood chips, permit application, expert opinions

Customer benefits

Full support by eta Energieberatung within the scope of the immission control permit application as well as coordination of the required environmental expertises and the parallel building application. This allowed the client and his partners to concentrate on the core competences of project implementation.


Technische Daten

  • Sludge drying: up to 50 t/day
  • Wood gasification CHP: 4 x 180 kWel
  • Biomass boiler: 900 kWth
  • Heating network
  • Moving floor as day bunker

Terms of reference

The basic concept, which will be implemented by the client in cooperation with renowned companies from the biomass, CHP and drying technology sectors, includes heat generation from wood pellets and forest chips as well as low-temperature sewage sludge drying.
The project required a permit in accordance with immission control law.

Scope of services

The services provided by eta Energieberatung comprised those planning services which result from the requirements for the application to the competent licensing authority for the construction and operation of a sewage sludge drying plant with bioenergy production.

Let us help you to realize your concepts

We would be happy to help you solving your questions on the use of biomass and on the planning and optimization of heating plants.


We will find the tailor-made solution for you too.


Call me without obligation or write me an e-mail.

Andreas Reichel

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