A method for realizing simultaneous denitrification and desulfurization by coupling sludge incineration flue gas and sludge drying condensate water

By coupling the treatment of sludge drying condensate and sludge incineration flue gas, and utilizing anaerobic digestion and ozone oxidation combined with short-cut denitrification and anaerobic ammonia oxidation, the problem of high reagent costs in the treatment of sludge incineration flue gas and sludge drying condensate is solved. This achieves efficient and stable denitrification and desulfurization, reduces operating and maintenance costs, and improves the resource utilization level of the system.

CN122321603APending Publication Date: 2026-07-03SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI UNIV
Filing Date
2026-05-21
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies for treating sludge incineration flue gas and sludge drying condensate have problems such as high reagent dosage, unstable treatment effect and high maintenance cost. In addition, the flue gas desulfurization and denitrification system is independent of the sludge treatment system, making it difficult to achieve efficient denitrification and deep desulfurization under conditions of high ammonia nitrogen and low organic matter.

Method used

By introducing sludge drying condensate into an anaerobic digester for anaerobic digestion, and then ozone oxidizing the sludge incineration flue gas to convert it into NO2 and SO3, the sludge drying condensate effluent is used as an absorbent to absorb nitrogen oxides and sulfur oxides in the flue gas. Combined with short-cut denitrification and anaerobic ammonia oxidation/sulfate anaerobic ammonia oxidation reaction, simultaneous denitrification and desulfurization are achieved.

Benefits of technology

The system achieves synergistic coupling between the sludge incineration system and the anaerobic digestion effluent treatment system, reducing the amount of reagents used, improving the stability of the treatment effect and the system's shock resistance, reducing operating and maintenance costs, and achieving efficient denitrification and desulfurization under high ammonia nitrogen conditions. The overall process is compact, energy-efficient, and highly resource-utilizing.

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Abstract

The application discloses a method for realizing simultaneous denitrification and desulfurization by coupling sludge incineration flue gas and sludge drying condensate water, which comprises the following steps: carrying out oxidation treatment on the dust and ash removed incineration flue gas by ozone oxidation; using sludge drying condensate water anaerobic digestion effluent as the only absorption liquid to absorb the incineration flue gas, so that NO x and SO x in the flue gas are transferred to the liquid phase; the absorption liquid is introduced into a short-cut denitrification reactor, and short-cut denitrification anaerobic ammonia oxidation and sulfate reduction anaerobic ammonia oxidation are utilized to realize simultaneous denitrification and desulfurization. The application realizes flue gas desulfurization and denitrification and sludge drying condensate water denitrification by coupling the incineration flue gas and the sludge drying condensate water and utilizing anaerobic ammonia oxidation and sulfate reduction anaerobic ammonia oxidation, and the reagent adding and operation cost are greatly saved.
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Citation Information

Patent Citations

  • Desulfurization and denitrification method for desulfurization and denitrification wastewater and ammonia-nitrogen wastewater

    CN108191056A

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

    CN108946944A

  • Method and apparatus for simultaneously removing sulfur oxide and nitrogen oxide contained in exhaust gas

    CN113677421A

  • Flue gas denitration and sludge anaerobic digestion cooperative treatment circulation method

    CN115028332A

  • Organic wastewater advanced treatment method and treatment device based on advanced oxidation coupling coagulation denitrification method

    CN121377385A