Non-equant distribution type microporous aeration pipe system for sewage treatment

Abstract

The invention discloses a non-equant distribution type microporous aeration pipe system for sewage treatment, which belongs to the field of sewage treatment microporous aeration pipe equipment, and consists of microporous aeration main pipes and microporous aeration branch pipes, wherein the microporous aeration main pipes are straight pipes which are formed by sequentially connecting a pluralityof microporous aeration straight pipes in the way of gradually increased inner diameters, the microporous aeration straight pipes have the same length but different inner diameters, the microporous aeration branch pipes are microporous aeration annular pipes which are symmetrically connected between two adjacent microporous aeration straight pipes which have different inner diameters, the microporous aeration main pipes are arranged in parallel at intervals, and microporous aeration main pipe orifices with large inner diameters are symmetrically connected with the two sides of a gas transmission main pipe, and are arranged in an aeration tank. Due to the pipe system design of the microporous aeration main pipes and the microporous aeration branch pipes, the mass transfer efficiency is improved, a strong annular stirring function is generated, dissolved oxygen in the aeration tank is ensured to be uniformly distributed along the horizontal and vertical directions, and the service scopeof bubbles which are generated by the microporous aeration pipe system is obviously increased, so the distribution density of the microporous aeration pipe system can be correspondingly reduced, materials are saved, and the microporous aeration pipe system is convenient to implement.

Description

technical field [0001] The invention relates to a non-equal-diameter split-flow microporous aeration pipe system for sewage treatment, which belongs to the field of microporous aeration pipe equipment for sewage treatment. Background technique [0002] Most of the energy consumption in the urban sewage treatment process is concentrated in the aerobic treatment process, and improving the efficiency of the aeration and oxygenation system has become the key to the operation and management of sewage plants. The current aeration methods mainly include: blast aeration, mechanical aeration and blast-mechanical aeration combining the two. The microporous aeration system in the blast aeration system is the most widely used because of its high aeration efficiency and strong adaptability. As the key equipment of the microporous aeration system, the main function of the microporous aeration diffuser is to control the size and distribution of the bubbles, and its air distribution and di...

AI Technical Summary

Problems solved by technology

The traditional microporous aeration tube mainly has the following problems in actual operation: (1) The traditional microporous aeration tube has the same internal diameter, equal pore diameter and equal opening ratio, so that the dissolved oxygen in the aerated water moves along the horizontal direction. uneven distribution

During the process of air flowing from the beginning to the end of the traditional microporous aeration tube during the aeration process, due to the resistance along the process and the release of some air bubbles, the pressure in the tube is continuously reduced, but due to the The internal diameter of the pipe at the beginning and the end, the diameter of the micropores on the surface of the pipe, and the opening ratio are the same, so the internal pressure of the initial microbubbles generated at the beginning and the end are different, so their rising speeds in the water are also different, resulting in microporous aeration The contact time between the air bubbles and water at the beginning and end of the tube is different, so the aeration effect at the beginning and end of the microporous aeration tube is different, and the dissolved oxygen in the water body at the corresponding position is also different, so that the dissolved oxygen in the entire pool along the length of the aeration tube Uneven distribution in the direction, that is, the dissolved oxygen in the water body is unevenly distributed in the horizontal direction, which affects the treatment effect of the aeration tank

(2) The shape of the traditional microporous aeration tube is a straight line, so the upward trajectory of the bubbles generated by each aeration tube in the water is a straight line parallel to each other, so the agitation ability of the bubbles in the horizontal and vertical directions is not strong, resulting in The turbulent diffusion effect is not strong, and the dissolved oxygen in the water after aeration is unevenly distributed along the vertical direction

Therefore, the traditional microporous aeration tube is linear, so that the bubbles produced by it mainly undergo interphase mass transfer at the gas-liquid interface when they rise in the water, and the turbulent diffusion of the bubbles in the water body is weak, that is, in the water body The dissolved oxygen in the vertical direction is unevenly distributed, which affects the treatment effect of the aeration tank

(3) In actual application, the traditional microporous aeration pipes are densely arranged, and the engineering cost is relatively high

In order to make the bubbles generated by the microporous aeration tube cover the entire aeration tank as much as possible, the traditional microporous aeration tube has a linear shape, so the arrangement density of the pipes can only be increased to meet the requirements.

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