Regulations last checked for updates: May 19, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
§ 421.144 - Standards of performance for new sources.

Any new source subject to this subpart shall achieve the following new source performance standards:

(a) Sodium Antimonate Autoclave Wastewater.

NSPS for the Primary Antimony Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of antimony contained in sodium antimonate product
Antimony30.15013.440
Arsenic21.7209.687
Mercury2.3440.937
Total suspended solids234.400187.500
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(b) Fouled Anolyte.

NSPS for the Primary Antimony Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of antimony metal produced by electrowinning
Antimony30.15013.440
Arsenic21.7209.687
Mercury2.3440.937
Total suspended solids234.400187.500
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(c) Cathode Antimony Wash Water.

NSPS for the Primary Antimony Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of antimony metal produced by electrowinning
Antimony60.31026.870
Arsenic43.43019.370
Mercury4.6871.875
Total suspended solids468.700375.000
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

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) andc, 1317 (b) andc,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 421.144