The integrated wastewater treatment system combines the removal of organic pollutants and ammonia nitrogen into one unit, primarily relying on the AO biological treatment process within the equipment.

In the A-grade process, due to the high concentration of organic matter in the wastewater, the microorganisms are in an anaerobic state. At this point, the microorganisms are facultative, converting organic nitrogen during their siesta into NH-N, while utilizing organic matter as an electron donor to transform NO-.

The N.NO-N is converted to N. Additionally, it utilizes some organic carbon sources and NH-N to synthesize new cellular substances. Therefore, the A-grade pond not only possesses certain organic matter removal capabilities, reducing the organic load of the subsequent aerobic pond, which is conducive to the digestion process, but also relies on the raw water

Organic substances with high concentrations in the water are processed through a reverse digestion process, ultimately eliminating the eutrophication pollution caused by excessive nitrogen.

Due to the significantly reduced organic concentration at the O stage, there is still a certain amount of organic matter and a high NH-N content. In order to further oxidize and decompose the organic matter, and ensure the digestion process proceeds smoothly with the completion of carbonization, the O stage is set up to...

Low organic loading biological contact oxidation ponds, mainly consist of aerobic microorganisms and autotrophic bacteria (digestive bacteria) in the O-stage pond, where aerobic microorganisms decompose organic matter into CO2 and H2O, and autotrophic bacteria (digestive bacteria) utilize the inorganic by-products generated from the decomposition of organic matter.

Carbon from organic matter or CO2 from the air serves as a nutrient source, converting NH-N in wastewater into NO-N. The effluent from the O-Level pool is recycled back to the A-Level pool, providing it with an electron acceptor. This facilitates the ultimate elimination of nitrogen pollution through denitrification.