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) > 421.146—Pretreatment standards for new sources.

421.146—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 antimony process wastewater introduced into a POTW shall not exceed the following values:
(a) Sodium Antimonate Autoclave Wastewater.
PSNS 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
(b) Fouled Anolyte.
PSNS 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
(c) Cathode Antimony Washwater.
PSNS 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