Regulations last checked for updates: May 01, 2025
Title 40 - Protection of Environment last revised: Nov 01, 2025
§ 421.110 - Applicability: Description of the primary columbium-tantalum subcategory.
The provisions of this subpart are applicable to discharges resulting from the production of columbium or tantalum by primary columbium-tantalum facilities.
[49 FR 8817, Mar. 8, 1984]
§ 421.111 - Specialized definitions.
For the purpose of this subpart the general definitions, abbreviations, and methods of analysis set forth in 40 CFR part 401 shall apply to this subpart.
[49 FR 8817, Mar. 8, 1984]
§ 421.112 - 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 shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:
(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 2.612 | 1.244
|
| Zinc | 9.080 | 3.794
|
| Ammonia (as N) | 829.000 | 364.500
|
| Fluoride | 217.700 | 124.400
|
| Total suspended solids | 255.000 | 121.300
|
| pH | (
1) | (
1)
|
(b) Subpart K—Solvent Extraction Raffinate.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 3.888 | 1.851
|
| Zinc | 13.520 | 5.647
|
| Ammonia (as N) | 1,233.000 | 542.500
|
| Fluoride | 324.000 | 185.100
|
| Total Suspended Solids | 379.500 | 189.500
|
| pH | (
1) | (
1)
|
(c) Subpart K—Solvent Extraction Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 1.032 | .491
|
| Zinc | 3.586 | 1.498
|
| Ammonia (as N) | 327.400 | 143.900
|
| Fluoride | 85.960 | 49.120
|
| Total suspended solids | 100.700 | 47.890
|
| pH | (
1) | (
1)
|
(d) Subpart K—Precipitation and Filtration.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 5.750 | 2.738
|
| Zinc | 19.990 | 8.350
|
| Ammonia (as N) | 1,825.000 | 802.200
|
| Fluoride | 479.100 | 273.800
|
| Total suspended solids | 561.300 | 267.000
|
| pH | (
1) | (
1)
|
(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 26.680 | 12.700
|
| Zinc | 92.730 | 38.740
|
| Ammonia (as N) | 8,466.000 | 3,722.000
|
| Fluoride | 2,223.000 | 1,270.000
|
| Total suspended solids | 2,604.000 | 1,239.000
|
| pH | (
1) | (
1)
|
(f) Subpart K—Tantalum Salt Drying.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt dried
|
| Lead | 25.430 | 12.110
|
| Zinc | 88.390 | 36.930
|
| Ammonia (as N) | 8,070.000 | 3,548.000
|
| Fluoride | 2,119.000 | 1,211.000
|
| Total suspended solids | 2,482.000 | 1,181.000
|
| pH | (
1) | (
1)
|
(g) Subpart K—Oxides Calcining Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium-tantalum oxide dried
|
| Lead | 16.140 | 7.685
|
| Zinc | 56.100 | 23.440
|
| Ammonia (as N) | 5,122.000 | 2,252.000
|
| Fluoride | 1,345.000 | 768.500
|
| Total suspended solids | 1,576.000 | 749.200
|
| pH | (
1) | (
1)
|
(h) Subpart K—Reduction of Tantalum Salt to Metal.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | 69.750 | 33.220
|
| Zinc | 242.500 | 101.300
|
| Ammonia (as N) | 22,140.000 | 9,732.000
|
| Fluoride | 5,813.000 | 3,322.000
|
| Total suspended solids | 6,809.000 | 3,239.000
|
| pH | (
1) | (
1)
|
(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | .858 | .409
|
| Zinc | 2.983 | 1.246
|
| Ammonia (as N) | 272.400 | 119.700
|
| Fluoride | 71.510 | 40.860
|
| Total suspended solids | 83.770 | 39.840
|
| pH | (
1) | (
1)
|
(j) Subpart K—Tantalum Powder Wash.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum power washed
|
| Lead | 8.582 | 4.087
|
| Zinc | 29.830 | 12.470
|
| Ammonia (as N) | 2,724.000 | 1,198.000
|
| Fluoride | 715.200 | 408.700
|
| Total suspended solids | 837.800 | 398.500
|
| pH | (
1) | (
1)
|
(k) Subpart K—Consolidation and Casting Contact Cooling.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated
|
| Lead | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Fluoride | .000 | .000
|
| Total suspended solids | .000 | .000
|
| pH | (
1) | (
1)
|
§ 421.113 - 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:
(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .174 | .081
|
| Zinc | .635 | .261
|
| Ammonia (as N) | 82.910 | 36.450
|
| Fluoride | 21.770 | 12.440 |
(b) Subpart K—Solvent Extraction Raffinate.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/Kg (pounds per million pounds) of concentrate digested
|
| Lead | 2.592 | 1.203
|
| Zinc | 9.442 | 3.888
|
| Ammonia (as N) | 1,233.000 | 542.5000
|
| Fluoride | 324.000 | 185.100 |
(c) Subpart K—Solvent Extraction Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .069 | .032
|
| Zinc | .251 | .103
|
| Ammonia (as N) | 32.790 | 14.420
|
| Fluoride | 8.610 | 4.920 |
(d) Subpart K—Precipitation and Filtration.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 3.833 | 1.780
|
| Zinc | 13.960 | 5.750
|
| Ammonia (as N) | 1,825.000 | 802.200
|
| Fluoride | 479.100 | 273.800 |
(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 1.778 | .826
|
| Zinc | 6.478 | 2.668
|
| Ammonia (as N) | 846.600 | 372.200
|
| Fluoride | 222.300 | 127.000 |
(f) Subpart K—Tantalum Salt Drying.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt dried
|
| Lead | 16.950 | 7.871
|
| Zinc | 61.750 | 25.430
|
| Ammonia (as N) | 8,070.000 | 3,548.000
|
| Fluoride | 2,119.000 | 1,211.000 |
(g) Subpart K—Oxides Calcining Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium-tantalum oxide
|
| Lead | 1.076 | .500
|
| Zinc | 3.919 | 1.614
|
| Ammonia (as N) | 512.200 | 225.200
|
| Fluoride | 134.500 | 76.840 |
(h) Subpart K—Reduction of Tantalum Salt to Metal.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | 46.500 | 21.590
|
| Zinc | 169.400 | 69.750
|
| Ammonia (as N) | 22,140.000 | 9,732.000
|
| Fluoride | 5,813.000 | 3,322.000 |
(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | .572 | .266
|
| Zinc | 2.084 | .858
|
| Fluoride | 71.510 | 40.860 |
(j) Subpart K—Tantalum Powder Wash.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum powder washed
|
| Lead | 5.721 | 2.656
|
| Zinc | 20.840 | 8.582
|
| Ammonia (as N) | 2,724.000 | 1,198.000
|
| Fluoride | 715.200 | 408.700 |
(k) Subpart K—Consolidation and Casting Contact Cooling.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated
|
| Lead | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Fluoride | .000 | .000 |
§ 421.114 - Standards of performance for new sources.
Any new source subject to this subpart shall achieve the following new source performance standards:
(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .174 | .081
|
| Zinc | .635 | .261
|
| Ammonia (as N) | 82.910 | 36.450
|
| Fluoride | 21.770 | 12.440
|
| Total suspended solids | 9.330 | 7.464
|
| pH | (
1) | (
1)
|
(b) Subpart K—Solvent Extraction Raffinate.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 2.592 | 1.203
|
| Zinc | 9.442 | 3.888
|
| Ammonia (as N) | 1,233.000 | 542.5000
|
| Fluoride | 324.000 | 185.100
|
| Total Suspended Solids | 138.900 | 111.100
|
| pH | (
1) | (
1)
|
(c) Subpart K—Solvent Extraction Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .069 | .032
|
| Zinc | .251 | .103
|
| Ammonia (as N) | 32.790 | 14.420
|
| Fluoride | 8.610 | 4.920
|
| Total suspended solids | 3.690 | 2.952
|
| pH | (
1) | (
1)
|
(d) Subpart K—Precipitation and Filtration.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 3.833 | 1.780
|
| Zinc | 13.960 | 5.750
|
| Ammonia (as N) | 1,825.000 | 802.200
|
| Fluoride | 479.100 | 273.800
|
| Total suspended solids | 205.400 | 164.300
|
| pH | (
1) | (
1)
|
(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 1.778 | .826
|
| Zinc | 6.478 | 2.668
|
| Ammonia (as N) | 846.600 | 372.200
|
| Fluoride | 222.300 | 127.000
|
| Total suspended solids | 95.270 | 76.210
|
| pH | (
1) | (
1)
|
(f) Subpart K—Tantalum Salt Drying.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt dried
|
| Lead | 16.950 | 7.871
|
| Zinc | 61.750 | 25.430
|
| Ammonia (as N) | 8,070.000 | 3,548.000
|
| Fluoride | 2,119.000 | 1,211.000
|
| Total suspended solids | 908.200 | 726.500
|
| pH | (
1) | (
1)
|
(g) Subpart K—Oxides Calcining Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium-tantalum oxide dried
|
| Lead | 1.076 | .500
|
| Zinc | 3.919 | 1.614
|
| Ammonia (as N) | 512.200 | 225.200
|
| Fluoride | 134.500 | 76.840
|
| Total suspended solids | 57.630 | 46.110
|
| pH | (
1) | (
1)
|
(h) Subpart K—Reduction of Tantalum Salt to Metal.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | 46.500 | 21.590
|
| Zinc | 169.400 | 69.750
|
| Ammonia (as N) | 22,140.000 | 9,732.000
|
| Fluoride | 5,813.000 | 3,322.000
|
| Total suspended solids | 2,491.000 | 1,993.000
|
| pH | (
1) | (
1)
|
(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | .572 | .266
|
| Zinc | 2.084 | .858
|
| Ammonia (as N) | 272.400 | 119.700
|
| Fluoride | 71.510 | 40.860
|
| Total suspended solids | 30.650 | 24.520
|
| pH | (
1) | (
1)
|
(j) Subpart K—Tantalum Powder Wash.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum powder washed
|
| Lead | 5.721 | 2.656
|
| Zinc | 20.840 | 8.582
|
| Ammonia (as N) | 2,724.000 | 1,198.000
|
| Fluoride | 715.200 | 408.700
|
| Total suspended solids | 306.500 | 245.200
|
| pH | (
1) | (
1)
|
(k) Subpart K—Consolidation and Casting Contact Cooling.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated
|
| Lead | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Fluoride | .000 | .000
|
| Total suspended solids | .000 | .000
|
| pH | (
1) | (
1)
|
§ 421.115 - 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 columbium-tantalum process wastewater introduced into a POTW shall not exceed the following values:
(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .174 | .081
|
| Zinc | .635 | .261
|
| Ammonia (as N) | 82.910 | 36.450
|
| Fluoride | 21.770 | 12.440 |
(b) Subpart K—Solvent Extraction Raffinate.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 2.592 | 1.203
|
| Zinc | 9.442 | 3.888
|
| Ammonia (as N) | 1,233.000 | 542.5000
|
| Fluoride | 324.000 | 185.100 |
(c) Subpart K—Solvent Extraction Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .069 | .032
|
| Zinc | .251 | .103
|
| Ammonia (as N) | 32.790 | 14.420
|
| Fluoride | 8.610 | 4.920 |
(d) Subpart K—Precipitation and Filtration.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 3.833 | 1.780
|
| Zinc | 13.960 | 5.750
|
| Ammonia (as N) | 1,825.000 | 802.200
|
| Fluoride | 479.100 | 273.800 |
(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 1.778 | .826
|
| Zinc | 6.478 | 2.668
|
| Ammonia (as N) | 846.600 | 372.200
|
| Fluoride | 222.300 | 127.000 |
(f) Subpart K—Tantalum Salt Drying.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt dried
|
| Lead | 16.950 | 7.871
|
| Zinc | 61.750 | 25.430
|
| Ammonia (as N) | 8,070.000 | 3,548.000
|
| Fluoride | 2,119.000 | 1,211.000 |
(g) Subpart K—Oxides Calcining Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium-tantalum oxide dried
|
| Lead | 1.076 | .500
|
| Zinc | 3.919 | 1.614
|
| Ammonia (as N) | 512.200 | 225.200
|
| Fluoride | 134.500 | 76.840 |
(h) Subpart K—Reduction of Tantalum Salt to Metal.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | 46.500 | 21.590
|
| Zinc | 169.400 | 69.750
|
| Ammonia (as N) | 22,140.000 | 9,732.000
|
| Fluoride | 5,813.000 | 3,322.000 |
(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | .572 | .266
|
| Zinc | 2.084 | .858
|
| Ammonia (as N) | 272.400 | 119.700
|
| Fluoride | 71.510 | 40.860 |
(j) Subpart K—Tantalum Powder Wash.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum powder washed
|
| Lead | 5.721 | 2.656
|
| Zinc | 20.840 | 8.582
|
| Ammonia (as N) | 2,724.000 | 1,198.000
|
| Fluoride | 715.200 | 408.700 |
(k) Subpart K—Consolidation and Casting Contact Cooling.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated
|
| Lead | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Fluoride | .000 | .000 |
§ 421.116 - 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 primary columbium-tantalum process wastewater introduced into a POTW shall not exceed the following values:
(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .174 | .081
|
| Zinc | .635 | .261
|
| Ammonia (as N) | 82.910 | 36.450
|
| Fluoride | 21.770 | 12.440 |
(b) Subpart K—Solvent Extraction Raffinate.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 2.592 | 1.203
|
| Zinc | 9.442 | 3.888
|
| Ammonia (as N) | 1,233.000 | 542.5000
|
| Fluoride | 324.000 | 185.100 |
(c) Subpart K—Solvent Extraction Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | .069 | .032
|
| Zinc | .251 | .103
|
| Ammonia (as N) | 32.790 | 14.420
|
| Fluoride | 8.610 | 4.920 |
(d) Subpart K—Precipitation and Filtration.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 3.833 | 1.780
|
| Zinc | 13.960 | 5.750
|
| Ammonia (as N) | 1,825.000 | 802.200
|
| Fluoride | 479.100 | 273.800 |
(e) Subpart K—Precipitation and Filtration Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of concentrate digested
|
| Lead | 1.778 | .826
|
| Zinc | 6.478 | 2.668
|
| Ammonia (as N) | 846.600 | 372.200
|
| Fluoride | 222.300 | 127.000 |
(f) Subpart K—Tantalum Salt Drying.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt dried
|
| Lead | 16.950 | 7.871
|
| Zinc | 61.750 | 25.430
|
| Ammonia (as N) | 8,070.000 | 3,548.000
|
| Fluoride | 2,119.000 | 1,211.000 |
(g) Subpart K—Oxides Calcining Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium-tantalum oxide dried
|
| Lead | 1.076 | .500
|
| Zinc | 3.919 | 1.614
|
| Ammonia (as N) | 512.200 | 225.200
|
| Fluoride | 134.500 | 76.840 |
(h) Subpart K—Reduction of Tantalum Salt to Metal.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | 46.500 | 21.590
|
| Zinc | 169.400 | 69.750
|
| Ammonia (as N) | 22,140.000 | 9,732.000
|
| Fluoride | 5,813.000 | 3,322.000 |
(i) Subpart K—Reduction of Tantalum Salt to Metal Wet Air Pollution Control.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum salt reduced
|
| Lead | .572 | .266
|
| Zinc | 2.084 | .858
|
| Ammonia (as N) | 272.400 | 119.700
|
| Fluoride | 71.510 | 40.860 |
(j) Subpart K—Tantalum Powder Wash.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of tantalum powder washed
|
| Lead | 5.721 | 2.656
|
| Zinc | 20.840 | 8.582
|
| Ammonia (as N) | 2,724.000 | 1,198.000
|
| Fluoride | 715.200 | 408.700 |
(k) Subpart K—Consolidation and Casting Contact Cooling.
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| mg/kg (pounds per million pounds) of columbium or tantalum cast or consolidated
|
| Lead | .000 | .000
|
| Zinc | .000 | .000
|
| Ammonia (as N) | .000 | .000
|
| Fluoride | .000 | .000 |
§ 421.117 - [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 421.115