Biological sewage denitrification method based on sulfur autotrophic short-cut denitrification, and reaction device

Abstract

The invention discloses a biological sewage denitrification method based on sulfur autotrophic short-cut denitrification. The biological sewage denitrification method comprises the following steps: introducing a thiosulfate solution into a gas stripping type up-flow reactor from the bottom; deposing the thiosulfate into elemental sulfur and sulfite under the action of sulfur oxidizing bacteria domesticated in an anaerobic environment in the reactor; introducing sewage containing ammonia nitrogen and nitrate into the gas stripping type up-flow reactor from the bottom; and making the elemental sulfur and sulfite be respectively subjected to short-cut denitrification reaction with nitrate, wherein the generated nitrite nitrogen and ammonia nitrogen generate nitrogen under the action of anaerobic ammonia oxidizing bacteria. According to the invention, by selecting a new sulfur source, the problem of toxicity of hydrogen sulfide or low elemental sulfur reaction rate in a sulfur autotrophicdenitrification process is solved; and by means of sulfur autotrophic short-cut denitrification, stable nitrite nitrogen is provided for anaerobic ammonia oxidation, and autotrophic nitrogen removal treatment based on anaerobic ammonia oxidation is achieved.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a sewage biological denitrification method and a reaction device based on sulfur autotrophic short-range denitrification. Background technique [0002] For sewage containing both ammonia nitrogen and nitrate, the traditional process usually requires a combination of nitrification and denitrification. First, nitrifying bacteria need to convert ammonia nitrogen into nitrate nitrogen under aeration conditions, and then denitrify by adding organic carbon sources to convert nitrate nitrogen into nitrogen gas. [0003] The discovery of anammox bacteria has opened up a new nitrogen cycle pathway, making it possible for sewage autotrophic denitrification. Different from traditional heterotrophic denitrification, anammox does not require organic carbon sources as electron donors for denitrification and carbon sources for biosynthesis. Anammox, as an autotrophic bacte...

AI Technical Summary

Problems solved by technology

However, the short-range denitrification technology is based on heterotrophic denitrification bacteria. In the process of using organic carbon sources for denitrification, excessive sludge will be generated, excessively occupying the living space of anammox bacteria or affecting the mass transfer process, thereby affecting anaerobic Ammonia oxidation activity

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