# On the whole a WWTP is

Considering the single WWTP, its inlet pollution load (in terms of BOD5, COD, TSS, Ntot and Ptot) as well as its treatment scheme, Fig. 4a shows the mechanism for verifying the biodegradability of the inlet wastewater. Instead, Fig. 4b and c shows the mechanism for testing the WWTP nitrogen and phosphorous removal capabilities, respectively,

Fig. 5. Mass balances for the assessment of N and P outlet concentrations (and ERs) as Calcium chloride function of the WWTP treatment scheme and the inlet load: (a) A = oxidation process for BOD removal; (b) mass balance for N-removal; (c) mass balance for P-removal; (d) B = oxidation process for BOD removal and chemical P-removal; (e) mass balance for N-removal; (f) mass balance for P-removal; (g) C = denitrification/nitrification/oxidation processes; (h) mass balance for N-removal; (i) mass balance for P-removal; (l) D = BPR (biological P-removal) and denitrification/nitrification/oxidation processes (A2O™); (m) mass balance for N-removal; (n) mass balance for P-removal. The inlet wastewater (for the adaptation treatment schemes A, B, C and D) comes from primary sedimentation with removals efficiencies of 25% and 60% for BOD5 and TSS, respectively (Metcalf and Eddy, 2003).Figure optionsDownload full-size imageDownload as PowerPoint slide