40 CFR 418.33: Effluent limitations and guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

The following limitations establish the quantity or quality of pollutants or pollutant properties, controlled by this section, which may be discharged by a point source subject to the provisions of this subpart after application of the best available technology economically achievable:

(a) The following limitations constitute the maximum permissible discharge for urea manufacturing operations in which urea is produced as a solution product:

Effluent characteristics Effluent limitations (mg/l)

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

Ammonia (as N) 0.53 0.27

Organic nitrogen (as N) 0.45 0.24

Note: Metric units: Kilogram/1,000 kg of product; English units: Pound/1,000 lb of product.

(b) The following limitations constitute the maximum permissible discharge for urea manufacturing operations in which urea is prilled or granulated:

Effluent characteristics Effluent limitations (mg/l)

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

Ammonia (as N) 0.53 0.27

Organic nitrogen (as N) .86 .46

Note: Metric units: Kilogram/1,000 kg of product; English units: Pound/1,000 lb of product.