Method of promoting removal of total nitrogen from wastewater through short-cut denitrification

Abstract

The invention discloses a method of promoting removal of total nitrogen from wastewater through short-cut denitrification. High ammonia-nitrogen wastewater enters a pretreatment unit, so that organicmatters are removed, and biogas is produced; then yielding water enters a short-cut nitrification-anaerobic ammonia oxidation denitrification unit, so that ammonia nitrogen and most total nitrogen areremoved; yielding water enters a sulfur reduction short-cut denitrification unit, and the biogas is introduced, so that nitrate nitrogen is transformed into nitrite nitrogen; partial yielding water of the sulfur reduction short-cut denitrification unit reflows to the short-cut nitrification-anaerobic ammonia oxidation denitrification unit, and suffers anaerobic ammonia oxidation reaction so as tofurther remove the total nitrogen; the remaining yielding water enters an aftertreatment unit, and suffers advanced treatment in the aftertreatment unit; and after yielding water of the aftertreatment unit reaches the emission standards, the water is discharged. The method has the advantages that the total nitrogen removal rate of anaerobic digestion yielding water is high; the wastewater denitrification and the biogas desulfurization are realized at the same time; the complete autotrophic denitrification is realized; the biogas biological desulfurization does not require oxygenation; and thewhole wastewater denitrification and biogas desulfurization system has low operating cost.

Description

technical field [0001] The invention relates to a short-range denitrification method using hydrogen sulfide in biogas as an electron donor to promote the removal of total nitrogen in wastewater, which belongs to the field of wastewater treatment and is suitable for livestock and poultry breeding wastewater, high-nitrogen and high-concentration industrial organic wastewater, landfill leachate, Denitrification and biogas desulfurization of biogas slurry produced by anaerobic digestion of excess sludge in urban sewage plants. Background technique [0002] Livestock and poultry breeding wastewater, high-nitrogen and high-concentration industrial organic wastewater, landfill leachate, and residual sludge from urban sewage plants generally use anaerobic digestion to remove organic matter and produce biogas. Denitrification treatment is required before. For high-nitrogen and low-carbon wastewater, traditional biological denitrification mainly adopts nitrification-denitrification m...

AI Technical Summary

Problems solved by technology

However, in theory, the short-cut nitrification-anammox process can only remove 89% of the total nitrogen. For the anaerobic treatment effluent with high nitrogen and low carbon, after the short-cu...

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