If you have stayed in a sewage plant or some place that treats industrial wastewater, you are likely to have seen a vortex concave air flotation aerator. This thing may seem unremarkable, but it is a skilled hand in separating impurities in sewage treatment. Many people get confused when they hear words like "vortex concave" and "air floating", thinking they must be very profound. In fact, when broken down, their principles and structures are very down-to-earth. Today, I will talk to everyone in plain language.
First, let's talk about its core principle. Simply put, it relies on the tiny bubbles generated to "bring" the dirty things in the sewage to the surface. When we usually treat sewage, there are always many pollutants that are difficult to precipitate, such as small suspended particles, oil, and some organic matter dissolved in water. These things have a density similar to water and cannot settle even after being left to stand for half a day. Ordinary sedimentation tanks cannot handle them at all.
The vortex concave air flotation aerator has seized this pain point. When it works, it generates a high-speed rotating water flow through a specific structure, forming a low-pressure area. This low-pressure area is like a 'small vortex' that can suck in air from the outside. As soon as the air enters the water, it is sheared into countless tiny bubbles by high-speed water flow. These bubbles are so small that they appear blurry to the naked eye, and their diameter is usually only a few tens of micrometers. Advertising 1688, reliable source of goods, more worry free shopping! Despite multiple purchases, the quality remains the same. Alibaba View
These tiny bubbles have a characteristic of being particularly easy to adsorb onto the surface of pollutants in wastewater. As time goes by, pollutants follow the bubbles and the overall density becomes smaller than water, slowly rising. When it floats to the surface, a layer of floating slag will form. Then, a scraper will be used to scrape off this layer of floating slag, and most of the impurities in the sewage will be separated. Compared to devices that require high-pressure equipment to create bubbles, it does not require additional pressure and can create bubbles by relying on the power of the water flow itself, which is also a very practical aspect of it.
Let's talk about its structure again. It's actually a "combination punch" made up of several key components, each with its own unique job. Without it, no one can do anything.
Firstly, there is the main body shell, which is like its' body bone '. It is usually made of corrosion-resistant steel or fiberglass, after all, it is soaked in sewage every day. If it is not corrosion-resistant, it will soon break down. The shape of the shell is very particular, mostly cylindrical, and there is a specialized flow guiding structure inside that can guide the water flow to form vortices, laying the foundation for suction and cutting bubbles, which is equivalent to setting up a stage for subsequent work.
Next is the impeller, which is its' heart 'component. The impeller is usually spiral or turbine shaped, driven by a motor to rotate at high speed. It is the high-speed rotation of the impeller that creates a low-pressure zone inside the shell, sucking in air. Moreover, the blade design of the impeller is very special. When it rotates, it can fiercely "shred" the air, turning it into small bubbles. If the impeller rotates slowly or the blades are damaged, the bubbles will become larger, and the effect of adsorbing pollutants will be greatly reduced.
Next is the intake passage, as the name suggests, it is a "passage" specifically reserved for air. It is usually installed on the upper or side of the shell, with one end open to the atmosphere and the other end connected to the low-pressure area formed by the rotation of the impeller. No need to install additional fans, relying solely on pressure difference, air can automatically enter the water through the channel, saving equipment costs and reducing energy consumption, which is particularly worry free.
There are also driving devices, mainly motors and couplings. The motor is like a "power source", providing energy for the impeller to rotate, while the coupling is a "bridge" connecting the motor and the impeller, which can smoothly transmit the power of the motor to the impeller. When we use it normally, the power of the motor should be selected according to the amount of sewage treated. If the water volume is large, choose the one with higher power, otherwise the impeller will not rotate and the treatment effect will be far worse.
Finally, the scraper device cannot be ignored. Although it is not the core component of the aerator, it is a key supporting equipment. After the bubbles carry pollutants to the surface of the water and form floating slag, the scraper acts like a "cleaner", slowly moving along the water surface to scrape the floating slag into a specialized slag collection tank for further processing. If it weren't for it, the floating scum would have been floating on the surface of the water, and sooner or later it would have fallen back into the water, which would have been equivalent to all the previous work being wasted.
In general, the vortex concave air flotation aerator relies on simple physical principles and uses several core components to efficiently separate difficult to treat impurities in wastewater. It not only has low energy consumption and simple maintenance, but also has stable treatment effects, so many sewage treatment scenarios now cannot do without it. The next time you see it spinning, you will know that a big play of "bubbles catching impurities" is taking place inside.
