§ 421.295 — Pretreatment Standards For Existing Sources

Except as provided in 40 CFR 403.7 and 403.13, any existing 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 existing sources. The mass of wastewater pollutants in secondary tin process wastewater introduced into a POTW must not exceed the following values:

(a) Tin smelter SO2 scrubber.

PSES for the Secondary Tin Subcategory

(b) Dealuminizing rinse.

PSES for the Secondary Tin Subcategory

(c) Tin mud acid neutralization filtrate.

PSES for the Secondary Tin Subcategory

(d) Tin hydroxide wash.

PSES for the Secondary Tin Subcategory

(e) Spent electrowinning solution from new scrap.

PSES for the Secondary Tin Subcategory

(f) Spent electrowinning solution from municipal solid waste.

PSES for the Secondary Tin Subcategory

(g) Tin hydroxide supernatant from scrap.

PSES for the Secondary Tin Subcategory

(h) Tin hydroxide supernatant from plating solutions and sludges.

PSES for the Secondary Tin Subcategory

(i) Tin hydroxide filtrate.

PSES for the Secondary Tin Subcategory