40 CFR § 420.93 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

---
identifier: "/us/cfr/t40/s420.93"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 420.93 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT)."
title_number: 40
title_name: "Protection of Environment"
section_number: "420.93"
section_name: "Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT)."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "420"
part_name: "IRON AND STEEL 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: "33 U.S.C. 1311, 1314, 1316, 1317, 1318, 1342, and 1361."
regulatory_source: "47 FR 23284, May 27, 1982, unless otherwise noted."
cfr_part: "420"
---


# 420.93 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

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 available technology economically achievable.

(a) *Sulfuric acid pickling (spent acid solutions and rinse waters)*—(1) *Rod, wire and coil.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000526 | 0.000175 |
| Zinc | 0.000701 | 0.000234 |

(2) *Bar, billet and bloom.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000169 | 0.0000563 |
| Zinc | 0.000225 | 0.0000751 |

(3) *Strip, sheet and plate.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000338 | 0.000113 |
| Zinc | 0.000451 | 0.000150 |

(4) *Pipe, tube and other products.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000939 | 0.000313 |
| Zinc | 0.00125 | 0.000417 |

(5) *Fume scrubbers.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |

The above limitations shall be applicable to each fume scrubber associated with a sulfuric acid pickling operation.

(b) *Hydrochloric acid pickling (spent acid solutions and rinse waters)*—(1) *Rod, wire and coil.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000920 | 0.000307 |
| Zinc | 0.00123 | 0.000409 |

(2) *Strip, sheet and plate.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.000526 | 0.000175 |
| Zinc | 0.000701 | 0.000234 |

(3) *Pipe, tube and other products.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Lead | 0.00192 | 0.000638 |
| Zinc | 0.00255 | 0.000851 |

(4) *Fume scrubbers.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Lead | 0.0368 | 0.0123 |
| Zinc | 0.0491 | 0.0164 |

The above limitations shall be applicable to each fume scrubber associated with a hydrochloric acid pickling operation.

(5) *Acid regeneration (absorber vent scrubber).*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Lead | 0.245 | 0.0819 |
| Zinc | 0.327 | 0.109 |

The above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants.

(c) *Combination acid pickling (spent acid solution and rinse waters)*—(1) *Rod, wire, and coil.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00213 | 0.000852 |
| Nickel | 0.00192 | 0.000638 |

(2) *Bar, billet, and bloom.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.000960 | 0.000384 |
| Nickel | 0.000864 | 0.000288 |

(3) *Strip, sheet, and plate—continuous.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00626 | 0.00250 |
| Nickel | 0.00563 | 0.00188 |

(4) *Strip, sheet, and plate—batch.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00192 | 0.000768 |
| Nickel | 0.00173 | 0.000576 |

(5) *Pipe, tube, and other products.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kg/kkg (pounds per 1,000 lb) of product |  |
| Chromium | 0.00322 | 0.00129 |
| Nickel | 0.00289 | 0.000964 |

(6) *Fume scrubbers.*

Subpart I

|  |  |  |
| --- | --- | --- |
|  | Kilograms per day |  |
| Chromium | 0.0819 | 0.0327 |
| Nickel | 0.0735 | 0.0245 |

The above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation.

[47 FR 23284, May 27, 1982; 47 FR 41739, Sept. 22, 1982, as amended at 49 FR 21031, May 17, 1984; 49 FR 24726, June 15, 1984]