LIMITS OF TOXIC SUBSTANCES IN SEWAGE
AT POINT OF ENTRY INTO MUNICIPAL SYSTEMS
| ||||
---|---|---|---|---|
Effluent Concentration Limits
| ||||
Parameter
|
30-DayAverage
(milligrams per liter)
|
24-Hour Average
(milligrams per liter)
| ||
Cadmium
|
0.4
|
0.8
| ||
Hex. 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
|
4.0
|
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
|
*NOTE:
|
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
|