UAD biological filter tower system based on sulfur autotrophy and denitrification method

Abstract

The invention relates to the technical field of sewage treatment and denitrification, and discloses a UAD biological filter tower system and method based on sulfur autotrophy, and the biological filter tower system comprises a water inlet mixing unit, a nitrogen removal uniform distribution unit, a biological membrane reaction unit and a water collection and drainage unit. Furthermore, the invention discloses a denitrification method based on the system. According to the method, autotrophic denitrifying bacteria are fixed in a high-specific-surface-area filler of an upflow biological filter tower, sulfur powder is used as an electron donor required by autotrophic denitrification, and nitrate nitrogen in sewage is degraded and removed under the condition that an organic carbon source does not need to be additionally added. The system has the advantages of high nitrogen removal efficiency, high treatment load, excellent effluent quality, intelligent operation control and the like, and is suitable for nitrogen removal treatment of high nitrate nitrogen industrial wastewater and nitrogen removal upgrading of municipal sewage secondary effluent.

Description

Technical field [0001] The present invention relates to the field of sewage denitrification treatment, discloses a sulfur-based UAD (UP-Flowautotrophic Denitrification) biofiltration tower system and a denitrification method. Background technique [0002] Eutrophication is a global phenomenon in recent decades. The increase in the emissions of nutrient elements in the water in the water and lakes tends to be rich. When eutrophication occurs in the water body, some algae has enormous, causing deterioration of water quality, full of fish smell, destroying the stability of the water ecosystem, which will seriously affect urban water supply and drinking water safety. The fundamental cause of eutrophication is the increase in nitrogen and phosphorus of nutrients. The second-stage treatment of urban sewage plants, the water and high nitrogen nitrogen industrial wastewater is the main source of sewage nitrogen emissions. [0003] In the existing old sewage treatment plant (station), the...

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Problems solved by technology

[0003] The content of biodegradable organic matter in the secondary biochemical section of the existing old sewage treatment plant (station) is low, that is, when the C / N is low, the original carbon source in the water can no longer meet the requirements of biological denitrification and denitrification. Additional organic carbon sources need to be added to the water

This brings about problems such as high operating costs and secondary pollution, and it is often difficult to achieve the ideal denitrification treatment effect

Wastewater from solar cell production and groundwater in uranium mining areas have a high content of nitrate nitrogen. At present, physical and chemical methods are used to treat high-concentration nitrate nitrogen wastewater, such as reverse osmosis, electrodialysis, ion exchange, etc., but the treatment cost is high. and difficult to maintain

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