3.2. COD removal
The effect of batch and continuous flow on the removal of COD,
ammonium (NH4-N), nitrate (NO3-N) and total phosphorus (TP)
were evaluated. Table 2 shows the overall average effluent
concentration and removal of the water quality parameter.
Fig. 2 presents the comparison of COD effluent concentrations
between batch and continuous flow at 4-day retention time. For the
test series of 4-day retention time, there were no significant
differences (p > 0.05) for COD removal between batch and
continuous flow modes for either the planted or unplanted treatments.
The statistical results were the same for the 2-day HRT:
therewas no significant difference when the results for batch mode
were compared to that for continuous flow (Table 2).