Theoretical COD consumptions for AB, DB, SRB and MPB in W1 and W2 wetland microcosms are shown in Fig. 3a.
COD consumptions for total microbes decreased from 281.3 mg L1 to 74.7 mg L1, and from 352.6 mg L1 to 100.9 mg L1 in the W1 and W2 microcosms, respectively.