CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY > SUBPART N—Primary Antimony Subcategory (§421.140 to §421.147) > 421.144—Standards of performance for new sources.

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
Antimony 30.150 13.440
Arsenic 21.720 9.687
Mercury 2.344 0.937
Total suspended solids 234.400 187.500
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
Antimony 30.150 13.440
Arsenic 21.720 9.687
Mercury 2.344 0.937
Total suspended solids 234.400 187.500
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
Antimony 60.310 26.870
Arsenic 43.430 19.370
Mercury 4.687 1.875
Total suspended solids 468.700 375.000
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.