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Experiences of running a hydroponic system in a pilot scale for resource-efficient water reuse

: Bliedung, Alexa; Dockhorn, Thomas; Germer, Jörn; Mayer, Claudia; Mohr, Marius

Volltext ()

Journal of water reuse and desalination. Online journal 10 (2020), Nr.4, S.347-362
ISSN: 2220-1319
ISSN: 2408-9370
ISSN: 2709-6092
ISSN: 2709-6106
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IGB ()
heavy metals; hydroponic system; lettuce; macronutrients and micronutrients; mass balance; Water reuse

Within the research project HypoWave, a hydroponic system for plant production was investigated. The hydroponic system was fed with wastewater that had undergone specially adapted treatment. The principal aim was to develop a combined system for water treatment and hydroponic plant production, where water and nutrients were reused efficiently to produce marketable food products. Another goal was to find out whether the reuse of pre-treated wastewater for plant growth in a hydroponic system could also present an additional alternative wastewater treatment step for enhanced nutrient removal. A pilot plant, consisting of various treatment steps such as activated sludge process, ozonation and biological activated carbon filtration, was used to produce lettuce with irrigation water of different qualities. The hydroponic pilot plant was operated in two different modes - flow-through and feed & deplete. This paper focuses on the influence of the various modes of operation and accordingly varying nutrient concentrations (N, P, K) on plant growth. Furthermore, heavy metal content in the various types of treated wastewater and in the produced plants was investigated. In addition, the results of the different modes of operation were verified by mass balances for N, P and K.