421.85—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 primary zinc process wastewater introduced into a POTW shall not exceed the following values:
(a)
Subpart H—Zinc Reduction Furnace Wet Air Pollution Control.
PSES
|
mg/kg (pounds per million pounds) of zinc reduced |
| Cadmium |
.334 |
.134 |
| Zinc |
1.702 |
.701 |
(b)
Subpart H—Preleach of Zinc Concentrates.
PSES
|
mg/kg (pounds per million pounds) of concentrate leached |
| Cadmium |
.180 |
.072 |
| Zinc |
.919 |
.378 |
(c)
Subpart H—Leaching Wet Air Pollution Control.
PSES
|
mg/kg (pounds per million pounds) of zinc processed through leaching |
| Cadmium |
.000 |
.000 |
| Zinc |
.000 |
.000 |
(d)
Subpart H—Electrolyte Bleed Wastewater.
PSES
|
mg/kg (pounds per million pounds) of cathode zinc produced |
| Cadmium |
.086 |
.035 |
| Zinc |
.441 |
.182 |
(e)
Subpart H—Cathode and Anode Wash Wastewater.
PSES
|
mg/kg (pounds per million pounds) of cathode zinc produced |
| Cadmium |
.150 |
.060 |
| Zinc |
.766 |
.315 |
(f)
Subpart H—Casting Wet Air Pollution Control.
PSES
|
mg/kg (pounds per million pounds) of zinc cast |
| Cadmium |
.051 |
.021 |
| Zinc |
.262 |
.108 |
(g)
Subpart H—Casting Contact Cooling.
PSES
|
mg/kg (pounds per million pounds) of zinc cast |
| Cadmium |
.036 |
.014 |
| Zinc |
.185 |
.076 |
(h)
Subpart H—Cadmium Plant Wastewater.
PSES
|
mg/kg (pounds per million pounds) of cadmium produced |
| Cadmium |
1.234 |
.494 |
| Zinc |
6.295 |
2.592 |