Multi-stage air stripping and separation integrated aerobic granular sludge reactor

Abstract

The invention relates to a multi-stage air stripping and separation integrated aerobic granular sludge reactor which comprises a pond body and a gas-liquid separation tank, wherein the pond body is provided with at least two sludge bulking air stripping areas at intervals from bottom to top, and other sludge bulking air stripping areas except for the undermost sludge bulking air stripping area are all internally provided with aerators; a precipitation area and an effluent weir are arranged at the upper part inside the pond body, and a water distributing pipe and a mud discharge pipe are arranged at the bottom of the pond body; the pond body is internally provided with an air stripping pipe and reflux pipe; the upper end of the air stripping pipe is extended into the gas-liquid separation tank and is connected with the liquid inlet of the gas-liquid separation tank, the lower end of the air stripping pipe is extended into the undermost sludge bulking air stripping area, and the air stripping pipe is provided with liquid extraction ports in all sludge bulking air stripping areas; the reflux pipe is connected between the gas-liquid separation tank and the undermost sludge bulking air stripping area. The device disclosed by the invention is provided with multi-stage gas-liquid air stripping circulation and gas-solid-liquid separation, can be used for realizing the integration of multi-stage air stripping and separation, is fast in gas-liquid circulation and high in mass transfer efficiency and can be used for fast generating the aerobic granular sludge in an operating process.

Description

technical field [0001] The invention relates to an aerobic reaction device used in the biochemical treatment stage of municipal and industrial wastewater treatment, and belongs to the technical field of wastewater aerobic reaction treatment. Background technique [0002] The various aerobic reaction wastewater treatment technologies currently used at home and abroad are mainly activated sludge method, SBR, CASS, A / 0, A / A / O, A / A / A / O, etc. Generally, the depth of the pool is less than 6 m, COD volume load is usually less than 1kgCOD.m3.d, flocculent sludge is used for start-up and operation. The above technologies occupy a large area, require a large investment, have a long construction period, and are relatively complicated in operation and management. It is difficult to apply to high-concentration water quality and sewage with poor biochemical properties. [0003] Chinese patent document CN103332784A discloses a "Three-Stage Circulating Aerobic Reactor". The upper part of ...

AI Technical Summary

Problems solved by technology

Although the reactor has quick start-up of flocculent sludge, can quickly generate aerobic granular sludge during operation, can effectively solve ammonia nitrogen and can reduce sludge, but it cannot make the mud-water mixture in the tank participate in the whole process of aeration. However, the mass transfer effect and wastewater treatment effect and efficiency need to be further improved. At the same time, multiple three-phase separators need to be installed, which has a complex structure and high cost.

In addition, the air bubbles in the gas-liquid will cause the phenomenon of "breathing" (gas-liquid flow intermittently) when the gas-liquid is running. Since the gas-liquid lifted by the stripper tube enters from the middle of the gas-water separation tank, the gas-liquid flow in the gas-water separation tank If this "breathing" phenomenon cannot be eliminated, it will cause impact on the inner wall of the gas-water separation tank, the effect and efficiency of gas-liquid separation will be poor, and it will also affect the service life of the gas-water separation tank

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