Fig. 5. Distribution of a) Heterotrophic (XH), b) Fermenting (XFB) and c) all bacteria groups together (XH, XA, XFB, XAMB, XASRB and XSOB) after 10 days of operation. The key at
the right indicates bacteria concentration in mgCOD L−1. Note that the images are longitudinal cross sections of the wetland (as in Fig. 1) which have been deformed to fit a reasonable
size. The x-axis of each image represents the longitudinal direction of the wetland (from 0 to 10.3 m) and the y-axis the depth of the wetland (from 0 to 0.7 m). Also note
that the coloured areas of each image correspond to wetted areas, while the white areas correspond to areas without water. Note that water level decreases from inlet to outlet.