Aeration-free external circulation completely autotrophic nitrogen removal over nitrite device

Abstract

The invention discloses an aeration-free external circulation completely autotrophic nitrogen removal over nitrite device. Wastewater in a water inlet and outlet tank is fed from the bottom of a contact oxidation tank through a peristaltic pump and a connecting pipeline, sufficiently contacts with microorganisms attached to environment-friendly polyethylene combined packing in the contact oxidation tank and then is discharged from the top of the contact oxidation tank, and effluent is pre-aerated by a drop aeration device arranged on the upper portion of the water inlet and outlet tank througha connecting pipeline and reenters the water inlet and outlet tank. The invention further discloses a rapid starting method of the aeration-free external circulation completely autotrophic nitrogen removal over nitrite device. completely autotrophic nitrogen removal is realized, an additional carbon source and aeration are omitted, and running cost is saved.

Description

technical field [0001] The invention belongs to the technical field of urban domestic sewage treatment and resource reuse, and in particular relates to a full-process autotrophic denitrification device for external circulation without aeration. Background technique [0002] Industrial wastewater, agricultural wastewater and domestic sewage are the most important sources of nitrogen pollution in natural water bodies. The main form of nitrogen in water bodies is ammonia nitrogen. When different forms of nitrogen-containing compounds are discharged into water bodies or transformed, they will cause serious pollution. Nitrogen pollution causes serious water quality pollution events such as eutrophication of water bodies, threatens human drinking water sources, and endangers human health and survival as well as the balance of natural ecology. Therefore, controlling the nitrogen content in sewage has become a hot issue for scholars worldwide in recent years. [0003] The principle...

AI Technical Summary

Problems solved by technology

The key condition for the application of the whole autotrophic denitrification process in urban sewage treatment is to control the micro-oxygen environment in the reactor, effectively inhibit the activity of nitrite oxidizing bacteria, and ensure the advantages of aerobic ammonium oxidizing bacteria and anaerobic ammonium oxidizing bacteria Poor micro-aerobic environment control, insufficient or excessive aeration will lead to deterioration of denitrification effect

Existing urban sewage treatment usually uses aeration machinery to control the dissolved oxygen concentration in the reactor with high energy consumption. There are problems such as high energy consumption, inaccurate dissolved oxygen control, and difficult control of micro-aerobic conditions. One of the restrictive factors in the application of denitrification process in urban sewage

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