40 CFR 420.25: Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart that introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and must achieve the following pretreatment standards for existing sources (PSES):

(a) Sintering operations with wet air pollution control system. The following table presents PSES for sintering operations with wet air pollution control systems:

Subpart B—Pretreatment Standards for Existing Sources (PSES)

Regulated parameter Maximum daily 1 Maximum monthly avg. 1

Ammonia-N 2 3 0.0150 0.00501

Cyanide 2 0.00300 0.00150

Phenols (4AAP) 2 0.000100 0.0000501

Lead 0.000451 0.000150

Zinc 0.000676 0.000225

2,3,7,8-TCDF <ML

1 Pounds per thousand lb of product.

2 The pretreatment standards for these parameters apply only when sintering wastewater is co-treated with ironmaking wastewater.

3 The pretreatment standards for ammonia are not applicable to sources that discharge to a POTW with nitrification capability (defined at § 420.02(s)).

(b) Sintering operations with dry air pollution control system. There shall be no discharge of process wastewater pollutants to POTWs.