Regulations last checked for updates: Nov 23, 2024
Title 40 - Protection of Environment last revised: Nov 21, 2024
§ 421.90 - Applicability: Description of the metallurgical acid plants subcategory.
The provisions of this subpart apply to process wastewater discharges resulting from or associated with the manufacture of by-product sulfuric acid at primary copper smelters, primary zinc facilities, primary lead facilities, and primary molybdenum facilities, including any associated air pollution control or gas-conditioning systems for sulfur dioxide off-gases from pyrometallurgical operations.
[49 FR 8811, Mar. 8, 1984, as amended at 50 FR 38342, Sept. 20, 1985]
§ 421.91 - Specialized definitions.
(a) Except as provided below, the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 apply to this subpart.
(b) The term product means 100 percent equivalent sulfuric acid, H2 SO4 capacity.
[50 FR 38342, Sept. 20, 1985]
§ 421.92 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
Subpart I—Metallurgical Acid Plant
| Pollutant or pollutant property
| BPT effluent limitations
|
|---|
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds of 100% sulfuric acid capacity
|
| Cadmium | 0.180 | 0.090
|
| Copper | 5.000 | 2.000
|
| Lead | 1.800 | 0.790
|
| Zinc | 3.600 | 0.900
|
| Fluoride
1 | 212.800 | 121.000
|
| Molybdenum
1 | 40.180 | 20.790
|
| Total suspended solids | 304.000 | 152.000
|
| pH |
2 |
2
|
§ 421.93 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable:
Subpart I—Metallurgical Acid Plant—BAT Effluent Limitations
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per/million pounds) of 100 pct sulfuric acid capacity
|
| Arsenic | 3.550 | 1.584
|
| Cadmium | 0.511 | 0.204
|
| Copper | 3.269 | 1.558
|
| Lead | 0.715 | 0.332
|
| Zinc | 2.605 | 1.073
|
| Fluoride
1 | 89.390 | 50.820
|
| Molybdenum
1 | [Reserved] | [Reserved].
|
§ 421.94 - Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
Subpart I—Metallurgical Acid Plant—NSPS
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per/million pounds) of 100 pct sulfuric acid capacity
|
| Arsenic | 3.550 | 1.584
|
| Cadmium | 0.511 | 0.204
|
| Copper | 3.269 | 1.558
|
| Lead | 0.715 | 0.332
|
| Zinc | 2.605 | 1.073
|
| Fluoride
1 | 89.390 | 50.820
|
| Molybdenum
1 | [Reserved] | [Reserved].
|
| Total suspended solids | 38.310 | 30.650
|
| pH | (
2) | (
2)
|
§ 421.95 - 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 metallurgical acid plant blowdown introduced into a POTW shall not exceed the following values:
Subpart I—Metallurgical Acid Plant—PSES
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pound per/million pounds) of 100 pct sulfuric acid capacity
|
| Cadmium | 0.511 | 0.204
|
| Zinc | 2.605 | 1.073 |
§ 421.96 - Pretreatment standards for new sources.
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 metallurgical acid plant blowdown introduced into a POTW shall not exceed the following values:
Subpart I—Metallurgical Acid Plant—PSNS
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of 100 pct sulfuric acid capacity
|
| Arsenic | 3.550 | 1.584
|
| Cadmium | 0.511 | 0.204
|
| Copper | 3.269 | 1.558
|
| Lead | 0.715 | 0.332
|
| Zinc | 2.605 | 1.073
|
| Fluoride
1 | 89.390 | 50.820
|
| Molybdenum
1 | [Reserved] | [Reserved].
|
§ 421.97 - [Reserved]
authority: 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,
c,
e,
and, 1316 (b) and
c, 1317 (b) and
c,
1318; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4
source: 49 FR 8790, Mar. 8, 1984, unless otherwise noted.
cite as: 40 CFR 421.91