Internal-loop air-lift anaerobic ammonia oxidation-autotrophic nitrogen removal plant and operating method thereof

Abstract

An internal-loop air-lift anaerobic ammonia oxidation-autotrophic nitrogen removal plant and an operating method thereof belong to the technical field of nitrogen removal of water treatment by an activated sludge process. Nitrogen is pre-charged into a gas collecting device, and a closed-loop nitrogen circulating system is employed for aerating an anaerobic ammonia oxidation reactor to produce anair-lift effect; internal circulation is formed in the reactor under the action of air-lift, so that sludge and water are fully mixed and contacted, thereby accelerating the conversion of flocculent sludge to granular sludge while enhancing the internal mass transfer effect; an aeration rate is regulated so as to change the internal hydraulic shear force, optimize the particle size distribution ofanaerobic ammonia oxidation granular sludge in the plant and improve the anaerobic ammonia oxidation nitrogen removal performance of the plant; and when high-concentration nitrogen-containing wastewater is treated in the reaction plant, a feed water dilution effect generated by reflux in the mixed liquid can significantly improve the impact load resisting capability of the system, avoid inhibition of nitrite nitrogen and facilitate stable and efficient operation of the plant.

Description

technical field [0001] The invention belongs to the technical field of activated sludge water treatment denitrification, and relates to a water treatment denitrification device and an operation method, in particular to an air lift internal circulation anaerobic ammonium oxidation autotrophic denitrification device and an operation method thereof . Background technique [0002] Environmental pollution caused by excessive discharge of nitrogen-containing pollutants into water bodies has aroused widespread concern. For high-concentration nitrogen-containing wastewater such as sludge digestate and landfill leachate, the traditional denitrification process is costly and difficult. In the process of exploring new nitrogen removal technologies, the anaerobic ammonium oxidation process developed by Delft University of Technology in the Netherlands stands out as one of the most promising nitrogen removal technologies. [0003] The anaerobic ammonium oxidation process is a new denit...

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Problems solved by technology

[0008] The purpose of the present invention is to propose a gas-lifting internal circulation anaerobic denitrification device for the current situation of difficult treatment of high-ammonia nitrogen wastewater and the uneven distribution of matrix, poor impact resistance, and easy generation of dead zones in traditional anammox autotrophic denitrification devices. Ammonia oxidation autotrophic denitrification device and its operation method, by changing the structure and operation method of the reactor, to obtain higher denitrification efficiency and operation stability

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