Process and device for continuous flow AOA with interval aeration and sludge single reflux

Abstract

The intermittent aerated sludge single-recirculation continuous flow AOA process and device belongs to the field of wastewater biological treatment and resource utilization. The device includes an influent tank, an intermittent aerated continuous flow AOA reactor, and a secondary sedimentation tank. Raw water is first pumped into the anaerobic section of the reactor by an influent pump for internal carbon source storage. It then enters the intermittent aeration section, where aerobic nitrification occurs in the aerobic section and denitrification occurs in the anoxic section using the stored carbon source. The process involves two aerobic sections and two anoxic sections, repeating the nitrification and internal denitrification processes. The second anoxic section is the longest, and the second compartment within it is equipped with an alternating aerobic and anoxic compartment. This invention fully utilizes the carbon source, rationally allocates aerobic and anoxic time for intermittent aeration, reduces internal carbon source loss due to aeration, promotes internal denitrification utilization, saves carbon source addition costs, and rationally utilizes resources, effectively promoting the development of carbon neutrality in urban wastewater treatment.

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