Digestate as Fertilizer

Reference plants
Total digestate treatment plant in lnwil
Presented technology:
Total digestate treatment plant
Manufacturer of the upgrading unit:
A3 Water Solutions GmbH
Manufacturer of the biogas plant:
CTU Clean Technology
Universe AG
Commissioning year:
2007
SWITZERLAND
Installad capacity: 1,350 Nm 3 /h
The Total digestate treatment plant has been running successfully since 2008
Amount of produced digestate: 45,500 t/a
Planning, construction, and delivery of a system for the treatment
of digestate from biogas plants. The digestate is highly loaded with
CSB, nitrogen and phosphorus. After a solids-liquids separation,
the fluid phase is treated with ultra-filtration and multi-stage reverse
osmosis. In addition to dischargeable water, the final product
consists of concentrated nitrogen, phosphorus and potassium.
For over ten years, A3 Water Solutions convinces with innovative
technologies for digestate treatment using the MPS method (Multi-
Phase-Separation).
The reference plant Inwil in Switzerland has been running continuously
since 2008. The digestate is treated in the cleaning process
in a way that the run-off water can directly be discharged in the
sewage system. If required, an extension can be added to achieve
direct discharge quality for discharging into the receiving water.
The different stages of the treatment process separate nitrogen
and phosphorus into individual fractions. They can be used separately
as plant fertilizer – depending on the regional conditions.
In the course of a 4-year-project funded by the DBU (Deutsche
Bundesstiftung Umwelt), the performance of the entire system was
increased further this year.
The optimised operating method of the ultrafiltration method at
high operating temperatures has been implemented in France for
the first time.
In this case, the application of the Hot Ultrafiltration method reduces
the demand for energy for the treatment by up to 50 percent.
With this, the waste heat from the CHPs is used which is partially
eligible for the KWK bonus.
Operator
Total-Gärproduktaufbereitungsanlage
Inwil
Im Feld
6034 Inwil
Schweiz
Contact person: Ulrich Brüß
Telephon: +49 2574 8875 820-0
Fax: +49 2574 8875 820-1
Mail: info@a3-gmbh.com
Website: www.a3-gmbh.com
Generated products: Liquid digestate, solid digestate,
dischargeable water, concentrated nutrient solution
Use of the digestate: Spreading as fertilizer
Marketing the digestate: Horticulture, landscaping, gardening
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