A/O coupled sulfur autotrophic denitrification enhanced low carbon-nitrogen ratio sewage denitrification and dephosphorization device and method

Abstract

The invention discloses an A/O coupled sulfur autotrophic denitrification enhanced low carbon-nitrogen ratio sewage denitrification and dephosphorization device, and a method, and belongs to the fieldof biological sewage treatment. The method comprises steps: raw water, a reflux solution of a sulfur autotrophic denitrification filter tank and reflux sludge of a secondary sedimentation tank are introduced into an anaerobic tank of an A/O process together, easily degradable organic matters are absorbed by phosphorus-accumulating bacteria in the anaerobic tank to synthesize PHAs, the PHAs are stored in the body, and phosphate is released; and the easily degradable organic matters are used by sulfur reducing bacteria to reduce sulfate into polysulfide, the polysulfide is transferred into sulfur oxidizing bacteria, and meanwhile, a phosphorus release effect is realized by sulfur oxidizing bacteria; mixed liquid of the anaerobic tank is introduced into an aerobic zone of the A/O process, the concentration of dissolved oxygen is controlled, ammonia nitrogen is completely converted into nitrate, and meanwhile, phosphorus-accumulating bacteria and sulfur-oxidizing bacteria are adopted to absorb a large amount of phosphorus; a supernatant of a secondary sedimentation tank is introduced into a sulfur autotrophic denitrification filter tank, and deep denitrification is carried out throughthe sulfur autotrophic denitrification effect. According to the method, the requirement of the A/O process on the carbon-nitrogen ratio of inlet water is reduced, and synchronous nitrogen and phosphorus removal of low-carbon-nitrogen-ratio sewage can be realized.

Description

technical field [0001] The invention proposes an A / O coupled sulfur autotrophic denitrification device and method for strengthening nitrogen and phosphorus removal from low-carbon-to-nitrogen ratio sewage, so as to improve the nitrogen and phosphorus removal effect of low-carbon-to-nitrogen ratio domestic sewage. The invention belongs to the biological technology field of sewage treatment, especially the treatment of sewage with low carbon-to-nitrogen ratio. Background technique [0002] With the improvement of people's living standards, the domestic sewage produced in China can reach tens of billions of tons every year. The large discharge of nutrients such as nitrogen and phosphorus will not only lead to the occurrence of eutrophication in water bodies, but may also cause the death of aquatic organisms and damage The ecological environment of natural water bodies may even endanger human health. In order to prevent water eutrophication, the content of nitrogen and phosphor...

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Problems solved by technology

However, sulfur autotrophic denitrification

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