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TU Berlin

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Dr.-Ing. Maximilian Fechter



Einführung in die Verfahrenstechnik anhand grundlegender Experimente (lab course)

Development of an economical ammonia stripping plant for fermentation residues in biogas plants for nutrient depletion and substrate flexibilisation (FNR project)

Bachelor's / Master's Theses

Current offers for theses can be found here.

The aim of the research project is to develop an economical ammonia stripping process for biogas plants. The particular focus is on regional nutrient removal, especially nitrogen. Further advantages result from the flexibilisation of the choice of substrate and the use of maize substitutes with a high ammonia formation potential. At the same time, the use of sulphuric acid in stripping gas regeneration is to be greatly reduced. To achieve this goal, a demonstration plant will be built in a two-phase research project on the basis of basic calculation parameters from laboratory tests, which will prove its feasibility in large-scale application. The two project phases are therefore divided into phase I: laboratory tests and project phase II: demonstration of the StripCompact concept in real operation, which follows a successful first project phase respectively builds on it.

The special feature of the StripCompact process is the use of flue gas from the CHP as stripping gas. This gas is first used to dry the solid fermentation residues and then to remove ammonia from the liquid phase of the fermentation residue at temperatures around 80 °C. (Fig 1 shows the general mass transfer from a liquid phase to a surrounding gas phase.)  The fermentation residue is then dried in the StripCompact process. The high CO2 loading of the stripping gas in the subsequent condensation is intended to improve the retention of ammonia gas in the scrubbing water by lowering the pH value and forming carbonates.

Fig. 1: General mass transfer from a liquid phase to a gas phase

In the first project phase, the important process engineering design parameters are to be determined in laboratory tests on a laboratory plant. These include mass transfer parameters, flow behaviour, stripping behaviour, condensation behaviour, purification of the stripping gas and sulphuric acid demand. Based on the data obtained, plant concepts for biogas plants of different sizes will be developed, calculated, designed and planned. On this basis, the application for the second phase and the associated design of the demonstration plant will be submitted.


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