Tiếng Việt
AAO (Anaerobic – Anoxic – Oxic). AAO technology is a biological treatment process that continuously applies many different microorganisms: Anaerobic, Anaerobic, and Aerobic microorganisms to treat waste. Under the effect of decomposing pollutants by microorganisms, the pollutants are treated before being discharged into the environment.
1. Operating principle
- Wastewater treatment by microorganisms stick on suspended solids like CAS. However AAO or AO process is more comprehensive and improve many shortcomings of CAS process
- Process reaction is aerobic microorganisms (tank aeroten)
- Key bio reaction processes include: anaerobic, annoxi and aerobic
2. Advantages
- Cheap investment cost because the system’s cost mainly include construction cost, some key equipment such as aeration, pump, mixer. No advanced technology is applied.
- Produce less surplus sludge compared to CAS because anaerobic and anoxic microorganisms help to treat BOD more comprehensively
- Outlet water quality can meet B or A standard, depend on the size of tanks
- Consume less power compared to CAS
3. Disadvantages
- Outlet water quality depends on sedimentation ability of activated sludge and size of tanks. If want good outlet water quality and less fluctuation of quality, will require huge land/ space to build up system
- Concentration of activated sludge in CAS system normally remains in the range from 3-5g/L, so that sludge can settle down, If Concentration is higher, sludge can over flow or turbility of outlet water may increase
- Outlet water quality maybe not stable, because sedimentation of sludge depends on many factors such as temperature, MLSS concentration, organic load and hydraulic load of inlet waste water, etc
- Footprint required is still large
- Require disinfection chemicals
4. Common design
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