Micro-nano bubble generation device and sewage purification system

Abstract

The invention discloses a micro-nano bubble generation device and a sewage purification system. The generation device comprises a sealed space and a micro-nano membrane pipe contained in the sealed space, wherein an air inlet, a liquid inlet and an air-liquid mixture outlet are formed in the sealed space, compressed air entering the sealed space from the air inlet permeates from the first side of the micro-nano membrane pipe to the second side of the micro-nano membrane pipe; pressurized liquid entering from the liquid inlet flows towards the air-liquid mixture outlet along the second side of the micro-nano membrane pipe so that the pressurized liquid is mixed with the air permeating through the micro-nano membrane pipe and flows out of the air-liquid mixture outlet. When the pressurized liquid such as sewage flows through the surface of the second side of the micro-nano membrane pipe, the trace air permeating to the second side of the micro-nano membrane pipe can be rapidly and continuously sheared by the pressurized liquid, so that a large amount of micro-nano bubbles are efficiently generated and the air utilization rate can be greatly improved; the energy consumption for pressurizing the liquid and compressing the air can be effectively reduced; the water purification effect can be improved and the micro-nano bubble generation device is suitable for various water treatment fields.

Description

technical field [0001] The invention relates to the field of generating micro-nano bubbles, in particular to a micro-nano-bubble generating device and a sewage purification system using the device. Background technique [0002] In the field of water treatment, air flotation and aeration are usually required to carry impurities in the water to the surface of the water through air bubbles for cleaning, so as to achieve the purpose of purifying sewage. For example, in the field of purification of oily wastewater, it is necessary to carry out air flotation and aeration on the wastewater to realize the purification of the wastewater. [0003] Generally, oily wastewater comes from a wide range of sources, among which oily wastewater from oil refineries, wastewater from oil exploration and development, wastewater from metallurgy, steel mills, cold rolling mills, tanker ballast water, emulsified oil from electromechanical and mechanical processing are the main industrial sources. W...

AI Technical Summary

Problems solved by technology

The disadvantages are: in the process of aeration, it is necessary to generate sufficient pressure to improve the transfer efficiency of molecular mass between gas and liquid, the ratio of gas to water consumed is high, and the energy consumption is high

The characteristics of the mechanical aeration method are: simple and centralized facilities, convenient maintenance and management, high oxygenation efficiency and obvious stratification of dissolved oxygen in water. It is often used in small aeration tanks, such as oxidation ditch; disadvantages: air pressure Large loss, high energy consumption, easy to break down, and the size of the microbubbles generated is large, and is greatly affected by the depth of the water treatment pool

Jet aeration has good oxygenation characteristics, effective gas dispersion and high mass transfer coefficient, uniform distribution of dissolved oxygen and air bubbles, but there are many shortcomings: relatively complex structure, high manufacturing cost, difficult to choose mechanical molding materials, Larger shear stress needs to be generated, poor adaptability to water treatment pool type, small water treatment capacity, etc.

Disadvantages: The conditions for the occurrence of microbubbles are relatively harsh; the scope of application has certain limitations, mainly for small and medium-scale chemical and biochemical industrial sewage treatment or fish factories, etc.

The characteristics of the vortex concave air flotation method are: the whole system is only composed of two mechanical parts, and the operation is simple; the equipment occupies a small area, reduces the civil construction investment, and the operating cost is low (energy saving); the disadvantage: the bubble diameter is large, The effect of removing suspended solids is poor, and it is generally used in situations where the treatment effect is not very high.

The advantages of the pressurized dissolved air method are: it can release a large number of micro-bubbles with fine size, uniform particle size, dense and stable, small equipment volume, convenient operation, and not easy to block; the disadvantage is that part or even all of the recycled water needs to be recycled, and energy consumption In addition, it is mostly used for solid-liquid separation of sewage in engineering, which is relatively limited

In addition, the pressurized gas-dissolving method needs to be equipped with: dissolved gas tank, pressure-stabilizing tank, dissolved gas release head or release device, and the operation and maintenance are relatively complicated.

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