Waste water denitrogenation and marsh gas desulfurization coupling technique

Abstract

The invention relates to a technology for coupling wastewater denitrification and biogas desulphurization, which is characterized in that: wastewater or pretreated wastewater flow into an anaerobic digestion unit; organic matter in the wastewater is transformed to biogas, and organic sulfur and sulfate are transformed to hydrogen sulfide, and organic nitrogen is transformed to ammoniacal nitrogen by the anaerobic digestion unit. The effluent of the precipitated anaerobic digestion unit flows into a digestion liquid aerobic processing unit; residual organic matter is degraded and the ammoniacal nitrogen is transformed to nitrate nitrogen or nitrite nitrogen by the digestion liquid aerobic processing unit. A denitrification and desulphurization unit adopts a tower reactor; the effluent of the precipitated aerobic processing unit flows into the reactor from the top of the tower reactor and the biogas generated by the anaerobic digestion unit flows into the reactor from the bottom of the tower reactor. The nitrate nitrogen or the nitrite nitrogen is transformed to nitrogen and the hydrogen sulfide is transformed to elemental sulfur or the sulfate by the tower reactor. The technology for coupling wastewater denitrification and biogas desulphurization has the advantages that: the nitrogen in the wastewater and the sulfur in the biogas are removed at the same time; no extra carbon source is needed in the denitrification of the anaerobic digestion liquid; no other catalyst and oxidizer are needed in the biogas desulfurization; little biological mud is generated and the operation cost is low.

Description

Technical field [0001] The invention belongs to the field of environmental engineering wastewater treatment, and is suitable for the denitrification of wastewater from livestock and poultry breeding, fermentation, chemical industry and the like, and the desulfurization of biogas, and is also suitable for the denitrification of urban sewage and the desulfurization of sludge digestion gas. Background technique [0002] For high-concentration organic wastewater, anaerobic digestion technology is generally used for pre-treatment to remove most of the organic pollutants, reduce the load of subsequent aerobic treatment, and at the same time recover energy-biogas, and then perform aerobic post-treatment. Generally, high-concentration organic wastewater contains a considerable amount of organic sulfur or inorganic sulfur, which is converted into hydrogen sulfide in the anaerobic digestion process, and is eliminated with the biogas. Therefore, the biogas contains a certain amount of hydro...

AI Technical Summary

Problems solved by technology

Colorless sulfur bacterial desulfurization is essentially the same as physical and chemical desulfurization. It needs to provide oxygen as an electron acceptor, so it needs to consume energy to supply oxygen (air), and oxygen (air) is not easy to control. Oxygen residues in biogas can easily cause explosions. Danger

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