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).

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Title 40: Protection of Environment

CHAPTER I: ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

SUBCHAPTER N: EFFLUENT GUIDELINES AND STANDARDS

PART 425: LEATHER TANNING AND FINISHING POINT SOURCE CATEGORY

Subpart B: Hair Save, Chrome Tan, Retan-Wet Finish Subcategory

425.21 - 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 (BPT):

1 Within the range 6.0 to 9.0.

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)

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