Fig. 10. Distribution of a) heterotrophic (XH), b) nitrifiying (XA), c) sulphide oxidizing (XSOB), d) fermenting (XFB), e) sulphate reducing (XASRB) and f)methanogenic (XAMB) bacteria after
580 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 towetted areas,while thewhite areas correspond to areas withoutwater.Note thatwater level decreases from inlet to outlet.