Limits of Toxic Substances in Sewage
| |||
---|---|---|---|
At Point of Entry into Municipal Systems
Parameter
|
Effluent Concentration Limits (mg/l) 30-Day
Average
|
24-Hour Average
| |
Cadmium
|
0.4
|
0.8
| |
Hexavalent chromium
|
0.2
|
0.4
| |
Total chromium
|
4.0
|
8.0
| |
Copper
|
0.8
|
1.6
| |
Lead
|
0.2
|
0.4
| |
Mercury
|
0.2
|
0.4
| |
Nickel
|
0.4
|
8.0
| |
Zinc
|
1.2
|
2.4
| |
Arsenic
|
0.2
|
0.4
| |
Available chlorine
|
50.0
|
50.0
| |
Cyanide-free
|
0.4
|
0.8
| |
Cyanide-complex
|
1.6
|
3.2
| |
Selenium
|
0.2
|
0.4
| |
Sulfide
|
6.0
|
12.0
| |
Barium
|
4.0
|
8.0
| |
Manganese
|
4.0
|
8.0
| |
Gold
|
0.2
|
0.4
| |
Silver
|
0.2
|
0.4
| |
Fluorides To fresh water
|
4.0*
|
8.0*
| |
To saline water
|
36.0
|
72.0
| |
Phenol
|
4.0
|
8.0*
|
NOTES:
| |
---|---|
*May be multiplied by a factor of 1.5 if the
municipal water supply is not fluoridated.
|
Constituents
|
Normal Range
(parts per million)
| |
---|---|---|
Suspended solids
|
180 to 350
| |
BOD
|
140 to 300
| |
Chlorine demand
|
5 to 15
|