Device and method for deep denitrification of sewage based on autotrophic and heterotrophic coupling of sulfur cycle

Abstract

The invention provides an autotrophic and heterotrophic coupled sewage deep denitrification device and method based on sulfur cycle, belonging to the technical field of sewage treatment. The unit for generating hydrogen sulfide in the sewage treatment process of the present invention uses lye to absorb hydrogen sulfide; lifts the absorbed sulfide to an anoxic pool, and the anoxic pool removes nitrate nitrogen through sulfur autotrophic denitrification; anaerobic methane production The remaining organic matter undergoes heterotrophic denitrification in the anoxic tank, and the anoxic unit performs the combination of sulfur autotrophic denitrification and organic matter heterotrophic denitrification. The biogas desulfurization process system only absorbs hydrogen sulfide, and the absorbed sulfide is utilized in the anoxic system to realize the recovery and utilization of sulfur element.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a device and method for deep deamination of sewage based on autotrophic and heterotrophic coupling of sulfur cycle. Background technique [0002] According to the "China Environmental Statistical Bulletin", the discharge of ammonia nitrogen from industrial sources is 9.4% of the total discharge. The industrial sewage produced by nitrogen fertilizer, pharmaceuticals, coking enterprises and other industries has high concentration of nitrogen pollutants and low C / N. The denitrification process needs to consume a large amount of organic carbon sources, resulting in high operating costs for sewage treatment, increasing the cost of sewage treatment plants and enterprises, and causing a huge waste of chemicals. [0003] However, general industrial wastewater contains a certain concentration of sulfur, and a large amount of hydrogen sulfide will be produced during anaerobic trea...

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Problems solved by technology

[0002] According to the "China Environmental Statistical Bulletin", the discharge of ammonia nitrogen from industrial sources is 9.4% of the total discharge. The industrial sewage produced by nitrogen fertilizer, pharmaceuticals, coking enterprises and other industries has high concentration of nitrogen pollutants and low C / N. The denitrification process needs to consume a large amount of organic carbon sources, resulting in high operating costs for sewage treatment, increasing the cost of sewage treatment plants and corporate sewage treatment, and causing a huge waste of chemicals

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