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 indium process wastewater introduced into a POTW must not exceed the following values: (a) Displacement Supernatant. PSES for the Secondary Indium Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of indium metal produced Cadmium 2.105 0.929 Lead 2.600 1.238 Zinc 9.037 3.776 Indium 2.724 1.114 (b) Spent Electrolyte. PSES for the Secondary Indium Subcategory Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/kg (pounds per million pounds) of cathode indium produced Cadmium 12.170 5.370 Lead 15.040 7.160 Zinc 52.270 21.840 Indium 15.750 6.444