Method and device for sludge digestive fluid two-level biological denitrification

Abstract

The invention provides a method and a device for sludge digestive fluid two-level biological denitrification, wherein the device comprises a sludge digestive fluid original water tank, a denitrification reactor, an autotrophic denitrification reactor and a secondary sedimentation tank; the sludge digestive fluid original water tank is provided with an overflow pipe and a blow-down pipe; the denitrification reactor is an upflow anaerobic sludge blanket (UASB) reactor, and is provided with a triphase separator, an exhaust pipe and a water outlet pipe; the autotrophic denitrification reactor comprises an anoxic zone, an aerobic zone, an anoxia biological film zone, the aerobic zone and the anoxia biological film zone; the anoxic zone has a stirrer and an agitating valve; the aerobic zone is provided with an aeration nozzle; the anoxia biological film zone is filled with sponge filler, and has the stirrer and the agitating valve; the secondary sedimentation tank is provided with a water outlet pipe, a sludge return pipe, a residual sludge pipe and a water outlet return pipe; the sludge digestive fluid original water tank is connected with an inlet valve of the denitrification reactor through a water pump; the water outlet pipe of the denitrification reactor is connected with the water inlet valve of the autotrophic denitrification reactor; an outlet valve of the autotrophic denitrification reactor is connected with a connecting pipe of the secondary sedimentation tank; and part outlet water is connected with the denitrification reactor through a water outlet reflux pump.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a two-stage biological denitrification method and device for sludge digestion liquid. Background technique [0002] Methane production from sludge is the main form of energy recovery in urban sewage plants. In the process, high-ammonia-nitrogen sludge digestate is produced. Due to the low content of organic matter and insufficient alkalinity, it is difficult to achieve the purpose of efficient biological nitrogen removal. The digested liquid nitrogen content of sludge accounts for 15-25% of the total nitrogen content of the sewage plant. If the denitrification treatment cannot be effectively carried out, but directly discharged to the sewage mainstream area of ​​the sewage plant, the urban sewage that is originally short of carbon sources will be even more lacking in carbon sources. , making it difficult for the effluent of urban sewage plants to meet the disc...

AI Technical Summary

Problems solved by technology

However, SRB reactor or CSTR reactor is mostly used for anaerobic ammonium oxidation treatment of sludge digestion liquid, and nitrate nitrogen in the effluent cannot be removed, which limits its denitrification efficiency

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