Air-lifting type external-circulation vortex enhanced biological nitrogen-removal reactor

Abstract

The invention discloses an air-lifting type external-circulation vortex enhanced biological nitrogen-removal reactor. The air-lifting type external-circulation vortex enhanced biological nitrogen-removal reactor is characterized by comprising a water distributing section, a reaction section and a separating section, wherein the water distributing section comprises a lower short circular barrel; a water distributor and a microporous aeration plate are arranged in the barrel, and the water distributor is communicated with a water inlet tube; the microporous aeration plate is communicated with a gas inlet tube; the reaction section comprises a long circular barrel, and a multi-stage Venturi tube is arranged in the long circular barrel; a flow-splitting region and a mixing region are respectively formed between the two ends of the multi-stage Venturi tube and the port of the long circular barrel, and are communicated by left and right circulating tubes to form circulation; the separating section comprises an upper short circular barrel, and a water outlet and gas outlet system is arranged in the barrel. By virtue of arranging the microporous aeration plate, the mixing region and the multi-stage Venturi tube, vortex flow fields are formed in the multi-stage Venturi tube, so that the mass transfer efficiency among gas, liquid and solid phases is effectively enhanced. Besides, the structure is combined with the flow-splitting region, the left circulating tube and the right circulating tube to form external circulation, so that an aerobic-anoxic alternating environment is formed, and therefore, the reactor has a nitrification and denitrification biological nitrogen removal function.

Description

technical field [0001] The invention relates to a wastewater treatment biological denitrification reactor, in particular to an air-lift external circulation vortex enhanced biological denitrification reactor. Background technique [0002] my country's water pollution problem is very serious. Nitrogen continues to enter the water body with sewage, which can cause eutrophication of the water body, cause excessive growth of aquatic plants and algae, and derive a series of adverse consequences such as "water blooms" and "red tides". The economic loss caused by this is as high as tens of billions of yuan every year. It can be seen that it is imperative to develop a high-efficiency denitrification bioreactor. [0003] Biological denitrification is generally divided into two stages, namely the nitrification stage and the denitrification stage. Under aerobic conditions, ammonia oxidizing bacteria and nitrite oxidizing bacteria in nitrifying bacteria undergo biological nitrification...

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Problems solved by technology

[0005] What the present invention aims to solve is the technical problem that the flow field in the existing airlift internal circulation reactor tends to be fully mixed and the efficiency is low

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