Table 4.
Factor coordinates of the variables analyzed by PCA for the three factors with eigenvalues >1
| Variable | Factor 1 (37.2%) | Factor 2 (26.0%) | Factor 3 (15.7%) |
|---|---|---|---|
| T | 0.465 | −0.785 | 0.137 |
| pH | −0.023 | −0.590 | 0.750 |
| MLSS | −0.297 | 0.644 | 0.428 |
| SVI | −0.888 | −0.024 | −0.087 |
| N-NO3 | 0.376 | 0.616 | 0.523 |
| O2 | −0.882 | −0.151 | 0.012 |
| N-NH4 | −0.769 | −0.205 | 0.237 |
T, temperature; MLSS, mixed liquor suspended solids; SVI, Sludge Volume Index.
The percentage of variation explained is given in parentheses. Parameters most affecting each factor are bolded.