40 CFR 405.12: 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 §§ 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 control technology currently available (BPT):

(a) For receiving stations receiving more than 150,000 lb/day of milk equivalent (15,600 lb/day or more of BOD5 input).

Effluent characteristic Effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days shall not exceed—

Metric units (kilograms per 1,000 kg of BOD5 input)

BOD5 0.475 0.190

TSS 0.713 .285

pH (1) (1)

English units (pounds per 100 lb of BOD5 input)

BOD5 0.048 0.019

TSS 0.071 .029

pH (1) (1)

1 Within the range 6.0 to 9.0.

(b) For receiving stations receiving 150,000 lb/day or less of milk equivalent (under 15,600 lb/day of BOD5 input).

Effluent characteristic Effluent limitations

Maximum for any 1 day Average of daily values for 30 consecutive days shall not exceed—

Metric units (kilograms per 1,000 kg of BOD5 input)

BOD5 0.625 0.313

TSS 0.938 .469

pH (1) (1)

English units (pounds per 100 lb of BOD5 input)

BOD5 0.063 0.031

TSS 0.094 .047

pH (1) (1)

1 Within the range 6.0 to 9.0.