40 CFR 467.25: 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 aluminum forming process wastewater introduced into a POTW shall not exceed the following values:

Subpart B

Core

Pollutant or pollutant property PSES

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum rolled with emulsions

Chromium 0.057 0.024

Cyanide 0.038 0.016

Zinc 0.190 0.079

TTO 0.090

Oil and grease (alternate monitoring parameter) 6.8 3.4

Subpart B

Direct Chill Casting Contact Cooling Water

Pollutant or pollutant property PSES

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cast by semi-continuous methods

Chromium 0.59 0.24

Cyanide 0.39 0.16

Zinc 1.94 0.81

TTO 0.92

Oil and grease (alternate monitoring parameter) 69 35

Subpart B

Solution Heat Treatment Contact Cooling Water

Pollutant or pollutant property PSES

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum quenched

Chromium 0.90 0.37

Cyanide 0.59 0.25

Zinc 2.98 1.25

TTO 1.41

Oil and grease (alternate monitoring parameter) 110 53

Subpart B

Cleaning or Etching Bath

Pollutant or pollutant property PSES

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium 0.079 0.032

Cyanide 0.052 0.022

Zinc 0.262 0.109

TTO 0.124

Oil and grease (alternate monitoring parameter) 9.3 4.7

Subpart B

Cleaning or Etching Rinse

Pollutant or pollutant property PSES

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium 0.61 0.25

Cyanide 0.41 0.17

Zinc 2.03 0.85

TTO 0.96

Oil and grease (alternate monitoring parameter) 73 36

Subpart B

Cleaning or Etching Scrubber Liquor

Pollutant or pollutant property PSES

Maximum for any 1 day Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium 0.85 0.35

Cyanide 0.56 0.23

Zinc 2.83 1.18

TTO 1.34

Oil and grease (alternate monitoring parameter) 100 50