Limits of Toxic Substances in Sewage
| ||
---|---|---|
Substance
|
Limit
(parts per million)
| |
Cadmium, as CD
|
0.3
| |
Chlorine requirement
|
15.0
| |
Chromium, as Cr (hexavalent)
|
3.0
| |
Copper, as Cu
|
0.2
| |
Cyanide, as CN
|
0.1
| |
Iron, as Fe
|
5.0
| |
Nickel, as Ni
|
2.0
| |
Phenol
|
10.0
| |
Zinc, as ZN
|
0.3
|
Constituents
|
Normal Range
(parts per million)
| |
---|---|---|
BOD
|
140 to 300
| |
Chlorine demand
|
15 to 15
| |
Suspended solids
|
80 to 350
|