Air-swing self-circulating denitrification reactor

Abstract

The invention discloses a gas oscillation type self-circulation denitrification reactor which is characterized in that a water distribution zone, a reaction zone, a separation zone, a circulation zone and a gas oscillation zone are arranged in a reactor body; the water distribution zone comprises a water inlet pipe, a gas inlet pipe and an aeration head; the reaction zone comprises an aerobic zone and a two-stage anaerobic zone; the separation zone comprises a gas release zone and a settling chamber; the circulation zone is provided with a reflux liquid suction pipe, a control valve and a connecting pipe; the gas oscillation zone comprises an aerobic zone gas collection chamber, a gas extraction liquid emptying pipe and a gas extraction liquid collection chamber. According to the gas oscillation type self-circulation denitrification reactor, a short-cut nitrification process is fused with an anaerobic ammonia oxidation process, the microorganism distribution is relatively fixed, the growth environment of functional bacteria can be optimized, and the biological denitrification can be enhanced; gas extraction liquid is controlled to be emptied to cause'gas oscillation' of the reactor, so that the mass transfer and the reaction can be promoted; reaction liquid is automatically circulated, and the nitrite salt is converted once generated, so that the bio-toxicity caused by nitrite salt accumulation can be avoided, the difficult problem of regulation and control on the matrix proportion can be solved, and the volumetric denitrification efficiency of the reactor can be improved.

Description

technical field [0001] The invention relates to a biological denitrification reactor, in particular to an air swing self-circulation denitrification reactor. Background technique [0002] Since the implementation of the "Twelfth Five-Year" Comprehensive Work Plan for Energy Conservation and Emission Reduction" and "The Twelfth Five-Year Plan for Energy Conservation and Emission Reduction", energy conservation and emission reduction work has been carried out in full swing. Oxygen, ammonia nitrogen, sulfur dioxide and nitrogen oxides have all achieved the annual targets for reducing the total emission of major pollutants. However, the total emission of ammonia nitrogen is still as high as 2.457 million tons, and its pollution control is still facing an extremely severe situation. After the organic pollutants are removed, the low carbon-to-nitrogen ratio (C / N ratio) becomes the main water quality characteristic of non-standard wastewater. Since the C / N ratio of substandard was...

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Problems solved by technology

However, the short-range nitrification process and the anammox process in the current design are usually separated into two devices, which may easily cause nitrite accumulation, inhibit ammonia oxidation, and limit the efficiency of the process; in addition, due to the anammox process (NH 3 +1.32NO 2 - +H + →1.02N 2 +0.26NO 3 - +2H 2 O) The required ratio of ammonia nitrogen and nitrite nitrogen is 1:1.32, such a matrix ratio is difficult to control in actual engineering

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