The volume of water or wastewater and the amount of N, P and
Chemical Oxygen Demand (COD) that each plant received during
the three-year experimental period are presented inTable 2. The
planning of fertilization was mainly to achieve equal amount of
nitrogen added between effluent and freshwater pots.
Samples of water and wastewater effluent were collected on
a monthly basis and transferred to the laboratory where the following parameters were measured: pH, EC, TKN, TP and COD.
Table 3presents the average values of the water and wastewater
samples during the experiments. Preparation and analyses of the
samples were performed according to Standard Methods for the
Examination of Water and Wastewater[9].