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| Subpart Y | Primary Rare Earth Metals Subcategory | 421.270 – 421.277 | |||||||||||||||||||||
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Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4.
49 FR 8790, Mar. 8, 1984, unless otherwise noted.
50 FR 38371, Sept. 20, 1985, unless otherwise noted.
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50 FR 38371, Sept. 20, 1985, unless otherwise noted.
The provisions of this subpart are applicable to discharges resulting from the production of rare earth metals and mischmetal by primary rare earth metals facilities processing rare earth metal oxides, chlorides, and fluorides.
In addition to what is provided below:
(a) The general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.
(b) The term rare earth metals refers to the elements scandium, yttrium, and lanthanum to lutetium, inclusive.
(c) The term mischmetal refers to a rare earth metal alloy comprised of the natural mixture of rare earths to about 94-99 percent. The balance of tha alloy includes traces of other elements and one to two percent iron.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Dryer Vent Water Quench and Scrubber.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.042 | 0.042 |
| Chromium (total) | 1.544 | 0.626 |
| Lead | 1.168 | 0.542 |
| Nickel | 2.295 | 1.544 |
| Total suspended solids | 62.600 | 50.080 |
| pH | (1) | (1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(b) Dryer vent caustic wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.007 | 0.007 |
| Chromium (total) | 0.272 | 0.110 |
| Lead | 0.206 | 0.095 |
| Nickel | 0.404 | 0.272 |
| Total suspended solids | 11.010 | 8.808 |
| pH | (1) | (1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(c) Electrolytic cell water quench and scrubber.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.094 | 0.094 |
| Chromium (total) | 3.474 | 1.409 |
| Lead | 2.629 | 1.221 |
| Nickel | 5.165 | 3.474 |
| Total suspended solids | 140.900 | 112.700 |
| pH | (1) | (1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(d) Electrolytic cell caustic wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.000 | 0.000 |
| Chromium (total) | 0.000 | 0.000 |
| Lead | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
| Total suspended solids | 0.000 | 0.000 |
| pH | (1) | (1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
(e) Sodium hypochlorite filter backwash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.004 | 0.004 |
| Chromium (total) | 0.134 | 0.054 |
| Lead | 0.101 | 0.047 |
| Nickel | 0.199 | 0.134 |
| Total suspended solids | 5.430 | 4.334 |
| pH | (1) | (1) |
| 1 Within the range of 7.5 to 10.0 at all times. | ||
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 rare earth metals process wastewater introduced into a POTW must not exceed the following values:
(a) Dryer vent water quench scrubber.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.042 | 0.042 |
| Chromium (total) | 1.544 | 0.626 |
| Lead | 1.168 | 0.542 |
| Nickel | 2.295 | 1.544 |
(b) Dryer vent caustic wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.007 | 0.007 |
| Chromium (total) | 0.272 | 0.110 |
| Lead | 0.206 | 0.095 |
| Nickel | 0.404 | 0.272 |
(c) Electrolytic cell water quench and scrubber.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.094 | 0.094 |
| Chromium (total) | 3.474 | 1.409 |
| Lead | 2.629 | 1.221 |
| Nickel | 5.165 | 3.474 |
(d) Electrolytic cell caustic wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.000 | 0.000 |
| Chromium (total) | 0.000 | 0.000 |
| Lead | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
(e) Sodium hypochlorite filter backwash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.004 | 0.004 |
| Chromium (total) | 0.134 | 0.054 |
| Lead | 0.101 | 0.047 |
| Nickel | 0.199 | 0.134 |
Except as provided in 40 CFR 403.7, any new 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 new sources. The mass of wastewater pollutants in primary rare earth metals process wastewater introduced into a POTW shall not exceed the following values:
(a) Dryer vent water quench and scrubber.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.042 | 0.042 |
| Chromium (total) | 1.544 | 0.626 |
| Lead | 1.168 | 0.542 |
| Nickel | 2.295 | 1.544 |
(b) Dryer vent caustic wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of mischmetal produced from wet rare earth chlorides | ||
| Hexachlorobenzene | 0.007 | 0.007 |
| Chromium (total) | 0.272 | 0.110 |
| Lead | 0.206 | 0.095 |
| Nickel | 0.404 | 0.272 |
(c) Electrolytic cell water quench and scrubber.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.094 | 0.094 |
| Chromium (total) | 3.474 | 1.409 |
| Lead | 2.629 | 1.221 |
| Nickel | 5.165 | 3.474 |
(d) Electrolytic cell caustic wet air pollution control.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.000 | 0.000 |
| Chromium (total) | 0.000 | 0.000 |
| Lead | 0.000 | 0.000 |
| Nickel | 0.000 | 0.000 |
(e) Sodium hypochlorite filter backwash.
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of total mischmetal produced | ||
| Hexachlorobenzene | 0.004 | 0.004 |
| Chromium (total) | 0.134 | 0.054 |
| Lead | 0.101 | 0.047 |
| Nickel | 0.199 | 0.134 |