Biological water purification processes
Biological processes make use of the self-cleaning properties of the ecosystems in which organisms prevail that can break down the existing substrates most efficiently. The precondition for this is that the substrates are, as a matter of principle, biodegradable. By using technical processes for biomass retention, these natural processes can take place highly intensively and in a very small space.
The Fraunhofer IGB has developed various bioreactors for wastewater treatment, for example anaerobic and aerobic loop reactors (gaslift / airlift reactors), membrane bioreactors or a fixed-bed circulation reactor in which the particle bed is periodically recirculated. Fixed-bed reactors are used in anaerobic technology to retain and thus enrich the active biomass that can become immobilized on and between the particles. On the Fraunhofer IGB fixed-bed circulation reactor the fixed bed is partially recirculated at certain times, thus permitting trouble-free operation on a sustained basis.
We select suitable bioreactors and the corresponding process concepts on the basis of the specific wastewater requirements and the intended reutilization, and we adapt them to regional, climatic and cultural conditions.