1. AO (Anoxic-Oxic) process: Also known as the anaerobic-aerobic process, A (Anaerobic) is the anaerobic stage, used for ammonia and phosphorus removal; O (Oxic) is the aerobic stage, used for removing organic matter from the water. Its advantage is that in addition to degrading organic pollutants, it also has a
(1) According to the urban wastewater treatment and pollution prevention technology policy, wastewater treatment facilities with a daily treatment capacity of 200,000 cubic meters or more (excluding 200,000 cubic meters/day) generally adopt the conventional activated sludge process. Other mature technologies may also be used. For wastewater treatment facilities with a
The A2O process primarily uses biological tanks with aeration devices, propellers (anaerobic and anoxic sections), and reflux. The channel layout is divided into anaerobic, anoxic, and aerobic tanks. An anaerobic tank is a reaction tank without dissolved oxygen or nitrates. Hydrolysis, acidification, acetic acid production, and methanation occur simultaneously to
