分类 | DO | CODMn | BOD5 | NH3-N | TP | TN |
I类 | 7.5 | 2 | 3 | 0.15 | 0.02 | 0.2 |
II类 | 6 | 4 | 3 | 0.5 | 0.1 | 0.5 |
III类 | 5 | 6 | 4 | 1.0 | 0.2 | 1.0 |
IV类 | 3 | 10 | 6 | 1.5 | 0.3 | 1.5 |
V类 | 2 | 15 | 10 | 2.0 | 0.4 | 2.0 |
劣V类 | <2 | >15 | >10 | >2.0 | >0.4 | >2.0 |