40 CFR § 421.282 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
---
identifier: "/us/cfr/t40/s421.282"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 421.282 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available."
title_number: 40
title_name: "Protection of Environment"
section_number: "421.282"
section_name: "Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "421"
part_name: "NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
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 (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."
regulatory_source: "49 FR 8790, Mar. 8, 1984, unless otherwise noted."
cfr_part: "421"
---
# 421.282 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) Tantalum alloy leach and rinse.
BPT Limitations for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of tantalum powder produced | |
| Copper | 438.100 | 230.600 |
| Lead | 96.850 | 46.120 |
| Nickel | 442.800 | 292.900 |
| Zinc | 336.700 | 140.700 |
| Tantalum | 103.800 | |
| Total suspended solids | 9,455.000 | 4,497.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(b) Capacitor leach and rinse.
BPT Limitations for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of tantalum powder produced from leaching | |
| Copper | 38.380 | 20.200 |
| Lead | 8.484 | 4.040 |
| Nickel | 38.780 | 25.650 |
| Zinc | 29.490 | 12.320 |
| Tantalum | 9.090 | |
| Total suspended solids | 828.200 | 393.900 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(c) Tantalum sludge leach and rinse.
BPT Limitations for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced | |
| Copper | 390.100 | 205.300 |
| Lead | 86.230 | 41.060 |
| Nickel | 394.200 | 260.700 |
| Zinc | 299.700 | 125.200 |
| Tantalum | 92.390 | |
| Total suspended solids | 8,417.000 | 4,003.000 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(d) Tantalum powder acid wash and rinse.
BPT Limitations for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of tantalum powder produced | |
| Copper | 0.665 | 0.350 |
| Lead | 0.147 | 0.070 |
| Nickel | 0.672 | 0.445 |
| Zinc | 0.511 | 0.214 |
| Tantalum | 0.158 | |
| Total suspended solids | 14.350 | 6.825 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |
(e) Leaching wet air pollution control.
BPT Limitations for the Secondary Tantalum Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
| --- | --- | --- |
| | mg/kg (pounds per million pounds) of equivalent pure tantalum powder produced | |
| Copper | 9.272 | 4.880 |
| Lead | 2.050 | 0.976 |
| Nickel | 9.370 | 6.198 |
| Zinc | 7.125 | 2.977 |
| Tantalum | 2.196 | |
| Total suspended solids | 200.100 | 95.160 |
| pH | () | () |
| Within the range of 7.5 to 10.0 at all times. | | |