Continuous flow biological denitrification method and device based on granular sludge

Abstract

The present invention discloses a continuous flow shortcut nitrification-anaerobic ammonium oxidation biological denitrification method based on granular sludge, and an apparatus. The method comprises: 1) carrying out sludge inoculation culture, and carrying out an active sludge adaptation period; 2) starting a shortcut nitrification-anaerobic ammonium oxidation reaction; 3) performing an anaerobic ammonium oxidation granular sludge formation and growth period; and 4) performing a stable operation period of a granular sludge continuous flow system. The apparatus comprises a water inlet tank, a bioreactor, a sedimentation tank and a hydraulic screen filter, wherein the water inlet tank, the bioreactor, the sedimentation tank and the hydraulic screen filter are sequentially communicated, the influent of the water inlet tank is communicated with high ammonia nitrogen wastewater, the effluent is communicated with the bioreactor, the concentrated sludge on the bottom of the sedimentation tank is communicated with the bioreactor through a sludge reflux pump, a fixation filler, a stirrer, a filtration screen and an aeration head communicated with an air compressor are arranged inside an anoxic reactor, the sedimentation tank is provided with a clear overflow port communicated with the hydraulic screen filter through a pipeline, the effluent of the hydraulic screen filter is the final effluent, and the retained granular sludge refluxes to the bioreactor.

Description

technical field [0001] The invention belongs to the technical field of biochemical wastewater treatment, and in particular relates to a method and a device for treating high-ammonia-nitrogen wastewater with a full-process autotrophic denitrification technology using granular sludge as the main body. The device uses fixed packing as the carrier to form anammox bacteria biofilm, and gradually forms anammox bacteria granular sludge through the growth, maturation and shedding of the biofilm; finally, the granular sludge is the main body, through ammonia oxidizing bacteria and anaerobic bacteria The synergistic effect of ammonium oxidizing bacteria achieves cost-effective denitrification. This process is suitable for the treatment of high ammonia nitrogen digested sludge dehydration liquid in urban sewage treatment plants, and also suitable for the treatment of industrial wastewater with high ammonia nitrogen and low carbon nitrogen ratio. Background technique [0002] The remov...

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Problems solved by technology

[0006] At present, there are still some technical problems in the anammox granular sludge process, which affect the start-up and stable operation of the anammox process, including: ① The mechanism of granular sludge formation is still unclear. Under the condition of oxidized granular sludge, the system start-up time is longer; ②The current anaerobic ammonium oxidation granular sludge is mainly realized in UASB reactor or SBR reactor, and it is still rarely used in continuous flow reactor; ③The current anaerobic ammonium oxidation granular sludge system still has difficulties in the control of dissolved oxygen, and generally requires intermittent aeration to maintain a low dissolved oxygen concentration, which increases the complexity of system operation

However, there is still a lack of patented technologies related to anammox granular sludge, especially the patented technology of forming anammox granular sludge in plug-flow reactors.

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