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

§ 471.51 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 for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):

(a) Rolling spent neat oils and graphite based lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(b) Rolling spent emulsions.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals rolled with emulsions
Copper0.8150.429
Nickel0.8240.545
Fluoride25.511.3
Molybdenum2.841.47
Oil and grease8.585.15
TSS17.68.37
pH( 1)( 1)

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

(c) Drawing spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(d) Extrusion spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(e) Extrusion press hydraulic fluid leakage.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals extruded
Copper2.261.19
Nickel2.291.51
Fluoride70.831.4
Molybdenum7.874.07
Oil and grease23.814.3
TSS48.823.2
pH( 1)( 1)

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

(f) Forging spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(g) Forging contact cooling water.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of forged refractory metals cooled with water
Copper0.6140.323
Nickel0.6200.410
Fluoride19.28.53
Molybdenum2.141.11
Oil and grease6.463.88
TSS13.36.30
pH( 1)( 1)
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