1. LawStack
  2. Title 40 - Protection of Environment
  3. Chapter I - ENVIRONMENTAL PROTECTION AGENCY
  4. Subchapter N - EFFLUENT GUIDELINES AND STANDARDS
  5. Part 425 - LEATHER TANNING AND FINISHING POINT SOURCE CATEGORY
  6. Subpart B - Hair Save, Chrome Tan, Retan-Wet Finish Subcategory
  7. 40 CFR § 425.21
40 CFR § 425.21
Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT)
June 9, 2020
CFR

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 (BPT):

Open Table
Pollutant or pollutant property BPT limitations
Maximum for any 1 day Maximum for monthly average
    Kg/kkg (or pound per 1,000 lb) of raw material
BOD5 8.2 3.7
TSS 11.8 5.4
Oil and grease 3.4 1.5
Total chromium 0.21 0.08
pH (1) (1)

1Within the range 6.0 to 9.0.

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§ 425.20 Applicability; description of the hair save, chrome tan, retan-wet finish subcategory
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§ 425.22 Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology (BCT)

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