40 CFR 405.52: 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 plants processing more than 25,000 lb/day of milk equivalent (more than 2,600 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 6.70 2.680

TSS 10.050 4.020

pH (1) (1)

English units (pounds per 100 lb of BOD5 input)

BOD5 0.670 0.268

TSS 1.005 .402

pH (1) (1)

1 Within the range 6.0 to 9.0.

(b) For plants processing 25,000 lb/day or less of milk equivalent (less than 2,600 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 8.926 4.463

TSS 13.388 6.694

pH (1) (1)

English units (pounds per 100 lb of BOD5 input)

BOD5 0.893 0.446

TSS 1.339 .669

pH (1) (1)

1 Within the range 6.0 to 9.0.