A method for rapidly realizing short-range biological denitrification by free ammonia (fa) inhibition combined with pH value

Abstract

The invention discloses a device and a method for quickly realizing shortcut biological denitrification through the combination of free ammonia (FA) restraining and a pH value, and belongs to the technical field of sewage biological denitrification. The device mainly comprises a raw water tank, a water inlet pump, a water inlet pipe, an alternate aerobiotic / anoxic reactor, an air compressor, an aeration pipe, an air disperser, a carbon source storage tank, a carbon source feeding pump, a carbon source feeding pipe, a stirrer, a pH determinator, a pH sensor and a water draining pipe. The aerobiotic aeration is implemented in the shortcut nitrification phase; under the condition of sufficient dissolved oxygen, ammonia nitrogen is oxidized to nitrite nitrogen by AOB in sludge, and the pH value is monitored at the same time; when the pH value appears the ammonia valley feature point, the nitrification reaction is finished, and the aeration is stopped immediately; an outer carbon source is added to implement the anoxic stirring, and the pH value is monitored at the same time; when the pH value appears the nitrite knee feature point, the denitrification is finished, and the precipitation and the water drainage are implemented. The pH value accurately controls the nitrification time and denitrification time, so that the shortcut nitrification can be quickly realized and stably maintained, and the bottleneck problem of the shortcut nitrification is solved.

Description

technical field [0001] The invention relates to a device and method for quickly realizing short-range biological denitrification of high-ammonia nitrogen wastewater, and belongs to the technical field of sewage biological denitrification. Background technique [0002] Municipal garbage leachate is the sewage produced by the digestion of domestic garbage and the leaching and scouring of rainwater, as well as the immersion of surface water and groundwater during the process of stacking and landfilling domestic garbage. Its main water quality characteristics are as follows: (1) High ammonia nitrogen content. Since the garbage contains a large amount of nitrogen-containing substances, the leachate produced by it has a high content of ammonia nitrogen. The nitrogen in the leachate mainly exists in the form of ammonia nitrogen, and the content of ammonia nitrogen in the fresh leachate accounts for about 85% to 90% of the total nitrogen. The landfill leachate is high-concentration...

AI Technical Summary

Problems solved by technology

The lower C / N ratio not only has a strong inhibitory effect on the biological treatment process, but also the lack of organic carbon sources makes it difficult for the denitrification reaction to proceed effectively.

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