421.125—Pretreatment standards for existing sources.
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in secondary silver process wastewater introduced into a POTW must not exceed the following values.
(a)
Subpart L—Film Stripping.
PSES
|
mg/troy ounce of silver from film stripping |
| Copper |
64.450 |
30.720 |
| Zinc |
51.360 |
21.150 |
| Ammonia (as N) |
6,712.000 |
2,951.000 |
(b)
Subpart L—Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.
PSES
|
mg/troy ounce of silver from precipitation and filtration of film stripping solutions |
| Copper |
1.242 |
.592 |
| Zinc |
.990 |
.408 |
| Ammonia (as N) |
129.300 |
56.840 |
(c)
Subpart L—Precipitation and Filtration of Film Stripping Solutions.
PSES
|
mg/troy ounce of silver precipitated |
| Copper |
73.690 |
35.120 |
| Zinc |
58.720 |
24.180 |
| Ammonia (as N) |
7,674.000 |
3,374.000 |
(d)
Subpart L—Precipitation and Filtration of Photographic Solutions.
PSES
|
mg/troy ounce of silver precipitated |
| Copper |
34.048 |
16.226 |
| Zinc |
27.132 |
11.172 |
| Ammonia (as N) |
3,545.000 |
1,559.000 |
(e)
Subpart L—Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.
PSES
|
mg/troy ounce of silver from precipitation and filtration of photographic solutions |
| Copper |
15.540 |
7.406 |
| Zinc |
12.380 |
5.099 |
| Ammonia (as N) |
1,618.000 |
711.400 |
(f)
Subpart L—Electrolytic Refining.
PSES
|
mg/troy ounce of silver from electrolytic refining |
| Copper |
.973 |
.464 |
| Zinc |
.775 |
.319 |
| Ammonia (as N) |
101.300 |
44.540 |
(g)
Subpart L—Furnace Wet Air Pollution Control.
PSES
|
mg/troy ounce of silver roasted, smelted, or dried |
| Copper |
.000 |
.000 |
| Zinc |
.000 |
.000 |
| Ammonia (as N) |
.000 |
.000 |
PSES
|
mg/troy ounce of silver produced from leaching |
| Copper |
.110 |
.053 |
| Zinc |
.088 |
.036 |
| Ammonia (as N) |
11.470 |
5.040 |
(i)
Subpart L—Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.
PSES
|
mg/troy ounce of silver produced from leaching or silver precipitated |
| Copper |
5.671 |
2.703 |
| Zinc |
4.519 |
1.861 |
| Ammonia (as N) |
590.500 |
259.600 |
(j)
Subpart L—Precipitation and Filtration of Nonphotographic Solutions.
PSES
|
mg/troy ounce of silver precipitated |
| Copper |
3.930 |
1.873 |
| Zinc |
3.132 |
1.290 |
| Ammonia (as N) |
409.300 |
179.900 |
(k)
Subpart L—Floor and Equipment Washdown.
PSES
|
mg/troy ounce of silver production |
| Copper |
.000 |
.000 |
| Zinc |
.000 |
.000 |
| Ammonia (as N) |
.000 |
.000 |