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Environmental Sciences Europe
Fig. 1 | Environmental Sciences Europe

Fig. 1

From: Post-ozonation in a municipal wastewater treatment plant improves water quality in the receiving stream

Fig. 1

Relative abundance of vulnerable taxa. SPEAR indicates the fraction of vulnerable species in the stream with and without ozonation followed by sand filtration (circles macroinvertebrate surveys, dotted line mean, blue bars 95 % confidence intervals). Ozonation increases the abundance of vulnerable species from 18 to 30 %. This increase of 12 % (CI 8–16 %) indicates improved ecological quality of the stream and shifts classification according to the WFD from poor to moderate [12]

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