Section NR 811.857 - Backwash wastewater from lime softening water treatment plants Filter backwash wastewater from lime softening water treatment plants shall be disposed of by any of the following methods:
(1) RECYCLE. Returned to the inlet end of the plant in accordance with the requirements of s. NR 811.862.(2) DISCHARGE TO A SANITARY SEWER. Lime softening backwash water may be discharged to a sanitary sewer system subject to the requirements under s. NR 811.85 (1) (a).(3) DISCHARGE TO A WATER OF THE STATE. Backwash wastewater from lime softening treatment plants may be discharged to a water of the state subject to the requirements under s. NR 811.85 (1) (b). Suspended solids shall be removed from the filter backwash wastewater prior to discharge by means of settling, and possibly coagulation. The pH shall be adjusted to within the range of 6.0 and 9.0 prior to surface water discharge.Wis. Admin. Code Department of Natural Resources NR 811.857
CR 09-073: cr. Register November 2010 No. 659, eff. 12-1-10.Amended by, CR 22-074: cr. (1) (title), am. (2), (3) Register January 2024 No. 817, eff. 2/1/2024