- (a) Aeration or mechanical mixing equipment shall be provided to maintain adequate mixing, using corner fillets and hopper bottoms with draw-offs to alleviate the accumulation of sludge and grit.
- (b) Aeration equipment shall be provided to maintain a minimum of 0.5 mg/L of dissolved oxygen in the mixed basin contents at all times, with an air supply that is isolated from other WWTP aeration requirements to facilitate process aeration control.
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