§ 471.21 — 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 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 emulsions.

Subpart B—BPT

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

(c) Forging contact cooling water.

Subpart B—BPT

(d) Forging equipment cleaning wastewater.

Subpart B—BPT

(e) Direct chill casting contact cooling water.

Subpart B—BPT

(f) Surface treatment spent baths.

Subpart B—BPT

(g) Surface treatment rinse.

Subpart B—BPT

(h) Sawing or grinding spent emulsions.

Subpart B—BPT

(i) Degreasing spent solvents—subpart B—BPT. There shall be no discharge of process wastewater pollutants.

(j) Wet air pollution control scrubber blowdown.

Subpart B—BPT