Low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal device and method

Abstract

The invention discloses a low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal device and a low-carbon urban sewage biological phosphorus removal and autotrophic biological nitrogen removal method. The device comprises a raw water tank, a biological phosphorus removal and half shortcut nitrification reactor, a secondary sedimentation tank, an intermediate water tank and an anammox reactor, wherein the biological phosphorus removal and half shortcut nitrification reactor is a university of cape town (UCT) reactor without internal returning of digestive fluid; the secondary secondary sedimentation tank is a radial-flow sedimentation tank; and the anammox reactor is an upflow anaerobic sludge blanket (UASB) reactor. The method comprises: introducing urban sewage first to the anaerobic zone of the biological phosphorus removal and half shortcut nitrification reactor for phosphorus release, then to an anoxic zone of the biological phosphorus removal and half shortcut nitrification reactor for denitrification and phosphorus absorption and finally to an aerobic zone for aerobic phosphorus absorption and half shortcut nitrification; subjecting mixed liquid containing ammonia nitrogen and nitrite nitrogen to sludge and water separation in the secondary sedimentation tank; and introducing the water to the anammox UASB reactor for autotrophic biological nitrogen removal under anammox action. When the method is used, process aeration can be reduced, energy consumption can be reduced, and carbon source is saved. The method is suitable for treating low-carbon sewage.

Description

technical field [0001] The invention relates to a sewage biological treatment technology, specifically, the phosphorus in the sewage is removed by phosphorus accumulating bacteria, and the ammonia nitrogen in the sewage is converted into nitrogen by short-range nitrification + anaerobic ammonium oxidation technology, so as to achieve the purpose of autotrophic biological denitrification . Background technique [0002] Existing urban sewage plants use traditional biological denitrification and phosphorus removal processes, which have a certain demand for carbon sources, because the anaerobic phosphorus release process requires organic carbon sources, and the denitrification process also requires organic carbon sources, but some cities Sewage is low-carbon water quality, that is, the organic carbon source contained cannot meet the needs of traditional biological nitrogen and phosphorus removal. In order to control the eutrophication of water bodies, the country has continuous...

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Problems solved by technology

[0002] Existing urban sewage plants use traditional biological denitrification and phosphorus removal processes, which have a certain demand for carbon sources, because the anaerobic phosphorus release process requires organic carbon sources, and the denitrification process also requires organic carbon sources, but some cities Sewage is low-carbon water quality, that is, the organic carbon source contained cannot meet the needs of traditional biological nitrogen and phosphorus removal

In order to control the eutrophication of water bodies, the country has continuously raised the discharge standards of nitrogen and phosphorus in sewage. This has caused some water plants to add external carbon sources, such as industrial alcohol, to meet the discharge standards. While increasing the operating costs of water plants, it also increased Increased sludge production and increased carbon dioxide production during the treatment process, which is not in line with the purpose of low-carbon economy and circular economy

[0003] The emergence of short-range nitrification + anammox technology makes biological denitrification without organic carbon source, suitable for the treatment of low-carbon high-ammonia nitrogen wastewater, and there have been engineering application examples in the treatment of sludge digestion liquid, but so far this technology has not been seen Application in urban sewage plants

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