1. (a) Liquid or solid phase sludge stabilization in accordance with this part shall be required prior to the beneficial use of sludge and scum in accordance with Env-Wq 800 and 40 CFR Part 503.

2. (b) Acceptable solid phase sludge stabilization processes after dewatering shall be based on the types and quantities of wastewater, septage, and other waste streams to be accepted, as applicable, and may include one or more of the following:

   1. (1) Composting;
   2. (2) Heat drying;
   3. (3) Pasteurization;
   4. (4) Air-drying; and
   5. (5) Lime stabilization.

3. (c) Acceptable liquid phase sludge stabilization processes shall be as follows:

   1. (1) Anaerobic digestion, including mesophilic and thermophilic processes;
   2. (2) Aerobic digestion;
   3. (3) Liquid lime stabilization; and
   4. (4) Other processes approved under Env-Wq 800 and 40 CFR Part 503.

Source. (See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06; ss by #10693, eff 10-15-14; ss by #14258, eff 7-1-25, EXPIRES: 7-1-35