40 CFR § 421.195
Pretreatment standards for existing sources
June 9, 2020
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 indium process wastewater introduced into a POTW must not exceed the following values:
(a) Displacement Supernatant.
PSES for the Secondary Indium Subcategory
Open Table
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of indium metal produced | ||
| Cadmium | 2.105 | 0.929 |
| Lead | 2.600 | 1.238 |
| Zinc | 9.037 | 3.776 |
| Indium | 2.724 | 1.114 |
(b) Spent Electrolyte.
PSES for the Secondary Indium Subcategory
Open Table
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of cathode indium produced | ||
| Cadmium | 12.170 | 5.370 |
| Lead | 15.040 | 7.160 |
| Zinc | 52.270 | 21.840 |
| Indium | 15.750 | 6.444 |
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