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Title 40: Protection of Environment
CHAPTER I: ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
SUBCHAPTER N: EFFLUENT GUIDELINES AND STANDARDS
PART 421: NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY
Subpart Q: Secondary Indium Subcategory
421.194 - Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Displacement Supernatant.
| 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 |
| Total suspended solids | 253.800 | 120.700 |
| pH | (1) | (1) |
(b) Spent Electrolyte.
| 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 |
| Total suspended solids | 1,468.000 | 698.100 |
| pH | (1) | (1) |
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