I would be concerned on ...

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I would be concerned on thickness of the sludge. Above about 2.2% the O2 transfer is very poor. A hyperbolic mixer(Invent) should fit lower in the tank and they are low HP. Aeration would help keep odor away. Over aeration can break apart the floc and make dewatering more expensive.

 

I think Patrick R. is on the right track. What kind of sludge and what do you want to do with the sludge.