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Environmental Sciences Europe
Fig. 10 | Environmental Sciences Europe

Fig. 10

From: Freshwater ecosystems profit from activated carbon-based wastewater treatment across various levels of biological organisation in a short timeframe

Fig. 10

Saprobic index at two sites in the Schussen River before and after the WWTP upgrade. Mean values and standard deviations are shown. Samples were taken two times per year in spring and autumn before (red; spring and autumn 2011, 2012, 2013) and after (blue; spring and autumn 2014, 2015, 2016) the WWTP upgrade. S0: reference site upstream of the effluent; S2: directly downstream of the effluent. Classification thresholds for “very good condition” (green line) and “good condition” (black line) according to the Water Framework Directive (stream type 3.2)

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