We operate several systems ...
Published by Richard Hill, President , Water Services, Inc.
We operate several systems that at times exceed design capacity. Some techniques we have used to treat the sewage and not change the physical plant, dealing with increase flow rates:
1. Bio-augmentation
We have achieved ~ over a 25% efficiency increase on biological reduction of BOD. A huge benefit when you consider the extremely low cost of the bacteria.
2. Addition of microbubble surface aerators
These are “Concentrated Oxygen Generators” that float on the surface. They can be installed in lift stations, channels, lagoons, any open area. Each COG-600 will infuse ~275 kg of O2 per day into .25 mm bubbles that collapse even smaller. Bubbles stay in suspension far longer than bottom diffusers. COGs can be moved, changed as needed. We have achieved an ~ 50% efficiency compared to bottom aeration.
3. In one situation we added submerged membrane filters
Submerged membrane filters (used in MBR) can increase efficiency by a factor of five.
You would end up with a hybrid system using one or more of these techniques.