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40 C.F.R. § 421.112

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

§ 421.112 Effluent limitations guidelines 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 shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

(a) Subpart K—Concentrate Digestion Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate digested
Lead2.6121.244
Zinc9.0803.794
Ammonia (as N)829.000364.500
Fluoride217.700124.400
Total suspended solids255.000121.300
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(b) Subpart K—Solvent Extraction Raffinate.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/kg (pounds per million pounds) of concentrate digested
Lead3.8881.851
Zinc13.5205.647
Ammonia (as N)1,233.000542.500
Fluoride324.000185.100
Total Suspended Solids379.500189.500
pH( 1)( 1)
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