CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 466—PORCELAIN ENAMELING POINT SOURCE CATEGORY > SUBPART B—Cast Iron Basis Material Subcategory (§466.20 to §466.25) > 466.21—Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

466.21—Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
(a) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(b) The discharge of process wasterwater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
Subpart B—BPT Effluent Limitations
Pollutant or pollutant Property Maximum for any 1 day Maximum for monthly average
Mg/m2 (pounds per/1million ft 2) of Area Coated
Chromium 0.29 (0.06) 0.12 (0.024)
Lead 0.11 (0.02) 0.09 (0.02)
Nickle 0.98 (0.02) 0.7 (0.15)
Zinc 0.93 (0.19) 0.39 (0.08)
Aluminum 3.16 (0.65) 1.29 (0.27)
Iron 0.86 (0.18) 0.44 (0.09)
Oil and grease 13.86 (2.84) 8.32 (1.71)
TSS 28.42 (5.82) 13.86 (2.84)
pH (1) (1) (1) (1)
1 Within the range 7.5 to 10.0 at all times.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
(a) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(b) The discharge of process wasterwater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
Subpart B—BPT Effluent Limitations
Pollutant or pollutant Property Maximum for any 1 day Maximum for monthly average
Mg/m2 (pounds per/1million ft 2) of Area Coated
Chromium 0.29 (0.06) 0.12 (0.024)
Lead 0.11 (0.02) 0.09 (0.02)
Nickle 0.98 (0.02) 0.7 (0.15)
Zinc 0.93 (0.19) 0.39 (0.08)
Aluminum 3.16 (0.65) 1.29 (0.27)
Iron 0.86 (0.18) 0.44 (0.09)
Oil and grease 13.86 (2.84) 8.32 (1.71)
TSS 28.42 (5.82) 13.86 (2.84)
pH (1) (1) (1) (1)
1 Within the range 7.5 to 10.0 at all times.