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Sewage treatment equipment removal of organic pollutants and ammonia nitrogen AO biological treatment process depends on the device. Which works in class a, due to the high concentration of organic substance in sewage, microorganisms in the gas State, organisms and micro-organisms, their organic wastewater ammonia conversion into NH3-N, and organic carbon as an electron donor, NO ¯t 2-N, NO ¯t 3-N into N2, and using some of the organic carbon and NH3-N synthesis of new cell material