Method and equipment for aerobic/anaerobic biofilter biological denitrogenation

Abstract

The invention discloses a method and equipment for aerobic / anaerobic biofilter biological denitrogenation. Intermitted water supply is carried out for the biofilter, and a denitrogenation process is divided into two processes including a nitrification process and a short-cut denitrification-anaerobic ammonia oxidation coupling process: that is a half of waste water to be treated is pumped into a biofilter for aerated nitrification, ammonia nitrogen is transformed into nitrate nitrogen, at the same time most COD in the waste water is removed, and organic loads in the subsequent reactions are reduced; when the nitrification process ends, aeration is stopped, the original waste water is pumped into the biofilter, degradable organics and ammonia nitrogen are introduced for respectively providing reaction matrixes and electron donors for the short-cut denitrification and the anaerobic ammonia oxidation, and synergistic denitrogenation of denitrifying bacteria and anaerobic ammonium oxidation bacteria is carried in the biofilter. The method overcomes the problem of insufficient carbon sources in traditional biological denitrogenation technology; the low C / N ratio waste water biological denitrogenation method has low sludge outputs without secondary pollution, external carbon sources are not added, and nitrogen removal rate reaches above 90%.

Description

technical field [0001] The invention belongs to the technical field of denitrification treatment of environmental engineering wastewater, and in particular relates to a biological denitrification treatment method and device for wastewater with a low carbon-to-nitrogen ratio, and is suitable for biological treatment of high-nitrogen and low-carbon wastewater such as domestic wastewater and landfill leachate. technical background [0002] Excessive discharge of nitrogen-containing substances in wastewater can easily lead to eutrophication of natural water bodies, excessive growth of algae plants, resulting in massive death of aquatic organisms such as fish, black and smelly rivers and other serious water environmental pollution problems. Nitrogen-containing wastewater such as domestic sewage and landfill leachate must undergo strict denitrification treatment before being discharged into natural water bodies. The "Water Pollutant Discharge Standards for Urban Sewage Treatment P...

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Problems solved by technology

SNAD (SimultaneouspartialNitrification, AnammoxandDenitrification) technology is to use NRBC (Non-wovenRotatingBiologicalContactor) reactor to realize the denitrification process of nitrifying bacteria, denitrifying bacteria and anammox bacteria co-existing in the same reactor, but it still needs to strictly control the short-term Nitrification stage, providing NO for anammox 2 — -N reaction matrix, it is difficult to maintain stability in practical application

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