Biological treatment: Anaerobic – Anoxic – Oxic (A2O)/ AO/ O

Biological treatment: Anaerobic - Anoxic - Oxic (A2O)/ AO/ O

Technology AAO.

Technology AO.

Technology features: Using microorganisms’ metabolism to biodegrade and transform biodegradable pollutants.
Treatment process: anaerobic (A) treats high-load BOD, COD, phosphorus, anoxic (A) treats Nitrogen and small amount of BOD, COD, Oxic (O) treats the remaining BOD and transform nitrogen.
Depends on waste water characteristics, 1, 2 or 3 treatment steps can be used.
Advantages:
– Little amount of sludge generated.
– Is a conventional and popular treatment methods, easy operation, can be programmed to automation.
– Effectively treat BOD, COD, Nitrogen, Phosphorus.
– Able to treat waste water of high organic load.
Disadvantages:
– Sensitive to temperature, pH, SS, heavy metals and other toxic components in influent waste water.
– Occupy average and above-average area.
Application:
AAO: waste water of food, husbandry and slaughtering, textile and dyeing industries… with high load of organic pollutants (high BOD, COD, phosphorus).
AO: waste water with high load of N, average BOD, COD (domestic waste water in general, industrial zone waste water, husbandry and slaughterhouse waste water…).
O: waste water contains average BOD, COD, little Nitrogen.

Small to large capacity



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