An innovative circular agricultural project took place in Baden Baden, Austria. The tanks for growing fish use water captured from the greenhouse roofs. The water used by the fish farm is recycled after advanced filtering and post-treatment with UV sterilisation. Separated waste water is used to irrigate the tomato greenhouses. The surplus electricity by the CHP plant is used for the tomato greenhouses to run the pumps, aerators, lighting and other electrical equipment. The surplus heat is used to keep the temperature in the fish tanks at 27° Celsius. Research on composting of organic substrate, plant residues and tomato waste is ongoing.

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