2. Hydrolysis and acidification should be carried out in front of aerobic tank to improve biodegradability.
3. Sludge backflow should not be too large, and the surface load of the secondary sedimentation tank should be less than 0.75, which completely solves the problem of incomplete sludge discharge at the bottom of the secondary sedimentation tank.
4. Before the sludge sedimentation ratio reaches 10%, the aeration rate should be carefully increased, and the sludge floc state and sedimentation density should be carefully observed.
5. If the effluent is qualified, the system must regularly discharge mud, but it is still far away.
The question you asked is very specific, it is difficult to say clearly here, and it is directly related to the design. According to your description, the current unsatisfactory sludge state is not entirely related to aeration, and it also has a lot to do with water quality.