Continuous flow low-carbon denitrification process for low-carbon-nitrogen-ratio domestic sewage

Abstract

The invention discloses a continuous flow low-carbon denitrification process for low-carbon-nitrogen-ratio domestic sewage, which is characterized in that an existing AAO (anaerobic-anoxic-oxic) water tank is utilized, submersible stirring equipment is additionally arranged in an O tank, and efficient treatment of the low-carbon-nitrogen-ratio domestic sewage is realized by controlling the time sequence of aeration of the O tank, opening and closing of a submersible stirrer and backflow of nitrification liquid. When the carbon-nitrogen ratio is larger than 2, the domestic sewage with the low carbon-nitrogen ratio is efficiently treated on the premise that a carbon source is not additionally arranged, limitation of harsh process control conditions such as short-cut nitrification and denitrification and anaerobic ammonia oxidation is avoided, and the efficient continuous flow low-carbon biological denitrification process is easy to use in an engineering mode and especially suitable for upgrading and reconstruction of an existing sewage plant.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a continuous flow denitrification process for domestic sewage with a low-carbon-nitrogen ratio. The low-carbon-nitrogen ratio refers to that the carbon-nitrogen ratio in the sewage is lower than 4. Background technique [0002] With the continuous improvement of sewage treatment requirements, domestic sewage denitrification requirements are getting higher and higher, and some regions require that the total nitrogen discharge concentration does not exceed 10mg / L. At present, traditional biological denitrification processes including AAO and AO require that the carbon-nitrogen ratio cannot be lower than 4, while the actual carbon-nitrogen ratio of domestic sewage is usually lower than 4, which requires additional carbon sources, which not only increases sewage The operating cost of the treatment also greatly increases carbon emissions. New treatment processes based on short-range nit...

AI Technical Summary

Problems solved by technology

At present, traditional biological denitrification processes including AAO and AO require that the carbon-to-nitrogen ratio cannot be lower than 4, while the actual carbon-to-nitrogen ratio of domestic sewage is usually lower than 4, which requires more carbon sources, which not only increases sewage The operating costs of the treatment also add significantly to the carbon footprint

New treatment processes based on theories of short-cut nitrification and denitrification and anaerobic ammonium oxidation, although theoretically applicable to sewage treatment with low carbon-to-nitrogen ratios, these new processes have high requirements on the water temperature, stability, and automatic control of sewage. It is very difficult and has not been widely used in engineering practice

Images