Sewage shortcut nitrification system

Abstract

The invention discloses a sewage shortcut nitrification system. The sewage shortcut nitrification system comprises a nitrification reactor and an automatic control system, wherein an ammonia nitrogen sensor, a solid concentration sensor and a dissolved oxygen sensor are arranged in the nitrification reactor, the ammonia nitrogen sensor, the solid concentration sensor and the dissolved oxygen sensor are respectively connected to the automatic control system; one side of the nitrification reactor is connected with a water inlet pump, the other side of the nitrification reactor is connected with sedimentation equipment, and an aeration system is arranged at the bottom of the nitrification reactor; and the sedimentation equipment is respectively connected to a sludge reflux pump and a sludge discharging pump, and the sludge reflux pump is connected to the nitrification reactor. The sewage shortcut nitrification system has the advantages that shortcut nitrification can be realized by controlling concentration of ammonia nitrogen and solids in mixed liquor under the condition of relatively high dissolved oxygen concentration, an ammonia nitrogen load can be increased, and greenhouse gas emission can be reduced; the growth rate of ammonia oxidizing bacteria (AOB) is relatively high, relatively high reaction efficiency can be obtained, and an ammonia nitrogen treatment load is increased.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sewage short-range nitrification system. Background technique [0002] Ammonia nitrogen is one of the main pollutants that cause eutrophication of water bodies, and nitrification reaction is the first step to remove ammonia nitrogen. Ammonia nitrogen (NH 4 + ) nitrification reaction is a two-stage reaction process, first under the action of AOB (ammonia oxidizing bacteria), NH 4 + oxidized to N-NO 2 - , and then oxidized to NO under the action of NOB (nitrite oxidizing bacteria) 3 - . By controlling the reaction conditions and eliminating NOB, short-range nitrification can be achieved, which has the advantages of saving aeration and denitrification carbon sources, and can be combined with anaerobic ammonium oxidation process to achieve full autotrophic denitrification and greatly reduce sludge production. Currently, short-cut nitrification usually relies on lo...

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Problems solved by technology

[0004] The purpose of the invention is to solve the current short-range nitrification of sewage using low dissolved oxygen concentration, so that the greenhouse gas N in the nitrification process 2 O emission increases, nitrification reaction rate is low, which is not conducive to the technical problem of improving sewage treatment efficiency

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