Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System
Chapter NR 245 - Grain Mills
Section NR 245.10 - Effluent limitations, best practicable treatment
Current through August 26, 2024
The following effluent limitations for all or specific subcategories establish, except as provided in subch. IV of ch. NR 220, the quantity or quality of pollutants or pollutant properties which may be discharged by a facility subject to the provisions of this chapter after application to process wastes of the best practicable control technology currently available.
(1) There shall be no discharge of process waste waters from the normal wheat flour milling, normal rice milling, animal feed, and hot cereal subcategories.
(2) The pH of all discharges shall be within the range of 6.0 to 9.0.
(3) The 30 day average and daily maximum limitations for BOD 5 and suspended solids are set forth in table 1.
(4) The effluent limitations for process subcategories in table 1 are in lbs/MsBu of corn or wheat processed and in lbs/1000lbs or kg/1000kg of rice processed. The limitations for corn and wheat may be converted to kg/1000kg by dividing the english unit limitation by 56 in the case of corn and 60 in the case of wheat.
(5) The effluent limitations for product subcategories in table 1 are in lbs/1000lbs or kg/1000kg of cereal product for the ready-to-eat subcategory and of wheat flour raw material for the wheat starch and gluten subcategory1.
Table 1
| BPT Effluent Limitation | ||||
| BOD5 | Suspended Solids | |||
| Process subcategory | Ave. | Max. | Ave. | Max. |
| corn dry milling | 4 | 12 | 3.5 | 10.5 |
| corn wet milling | 50 | 150 | 50 | 150 |
| bulgur wheat flour milling | .5 | 1.5 | .5 | 1.5 |
| parboiled rice milling | .14 | .4 | .08 | .24 |
| 2 | ||||
| Product subcategory | ||||
| ready-to-eat cereal | 0.40 | 1.2 | 0.4 | 1.2 |
| wheat starch and gluten | 2.0 | 6.0 | 2.0 | 6.0 |
