CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY > SUBPART K—Alkaline Cleaning Subcategory (§420.110 to §420.117) > 420.112—Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

420.112—Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).

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) Batch.
Subpart K
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of product
TSS 0.0730 0.0313
O&G 0.0313 0.0104
pH (1) (1)
1 Within the range of 6.0 to 9.0.
(b) Continuous.
Subpart K
Pollutant or pollutant property BPT effluent limitations
Maximum for any 1 day Average of daily values for 30 consecutive days
Kg/kkg (pounds per 1,000 lb) of products
TSS 0.102 0.0438
O&G 0.0438 0.0146
pH (1) (1)
1 Within the range of 6.0 to 9.0.