Fig. 2.
Main interactions between bacteria groups (coloured boxes) and substrates (circles) in the a) carbon, b) nitrogen and c) sulphur cycles. The substrates at the top of the image enter the wetland with the influent wastewater. Inert particulate COD (XIm and XIf) and soluble intert COD (SI) are not included in the Figure since they are neither degraded nor transformed within the wetland. Note, though, that the decay of all bacteria groups and hydrolysis produce inert particulate COD. Dissolved oxygen (SO) enters the system by passive diffusion from the atmosphere and is also released by plant roots. The components marked with a (*) are not considered in BIO_PORE. Refer to Table 2 for a description of every component.