How about adding a vacuum degasser between the AO tanks?
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As mentioned in a post from a few days ago, the DO level in tank A of our company’s AO process is between 2-5 mg/L. I think that, apart from reducing the backflow of liquid and increasing the sludge volume, the most direct and effective approach is to degas the wastewater before it enters tank A. What do you all think?
That’s a good idea, but what about the cost?
Dissolved oxygen cannot be removed; is it possible to replace it with nitrogen? It’s not worth it.
If it cannot be removed, it is difficult to reduce the DO in pool A of AO below 0.5 mg/L.
First, reduce the internal recirculation flow rate, lower the dissolved oxygen level in the aerobic tank, and increase the retention time in the secondary sedimentation tank; if possible, add a carbon source at the anoxic inlet.