Index

BOD

(biochemistry)

Ammonia nitrogen

Petroleum category

Total nitrogen

Total phosphorus

COD

I Class

≤3

≤0.015

≤0.05

≤0.2

≤0.01

≤15

II Class

3

0.5

0.05

0.5

0.025

15

III Class

4

1.0

0.05

1.0

0.05

20

IV Class

6

1.5

0.5

1.5

0.1

30

V Class

10

2.0

1.0

2.0

0.2

40