How to choose an aerator for an AAO tank?

AAOThe pool process system consists of water distribution, anaerobic tank, anoxic tank, aerobic tank, secondary sedimentation tank (digestion liquid) internal reflux, (sludge) external reflux, venting, aeration system, dosing (optional) effluent, and residual sludge discharge. Below, the Nanjing Feili Environmental Protection editor will briefly explain the process of the aeration system:

AAOThe selection of pool aerators, which have a longer aerobic section in the process, can be supported by aerators or aerators. From an energy-saving perspective, micro porous aeration can be used. However, if there are several situations, then aerators with greater flushing force should be chosen for better results!

1. Water contains pollutants such as fibers, pulp, oil, tar, and solid powder that can easily clog micro porous aerators.

2. Wastewater is corrosive or has a temperature higher than 30 ℃;

3. Using contact oxidation process makes it inconvenient to enter below the packing layer for aerator maintenance;

4. The contact oxidation process is adopted, and fillers are added to the aerobic tank. The surface of the fillers is covered with a high concentration of microbial film, which requires sufficient aeration bubbles or hydraulic flushing force to remove the inactive biofilm and facilitate the growth of new biofilm. Micro porous aerators cannot meet the requirements of flushing organisms.

Taking the commonly used aerator in the treatment of papermaking wastewater as an example, due to the presence of fibers in the water, it is not suitable to use ordinary microporous aeration. Instead, a low-pressure jet aerator can be used to avoid clogging of the aerator. Its working principle is to use a centrifugal pump to circulate a large proportion of water in the aerobic tank, while introducing low-pressure air and high-speed water flow to cut the air and generate high-speed vortex filling.