Let's talk about something practical today - cavitation air flotation. Many friends get confused when they hear this term, feeling that it is some advanced black technology. In fact, it is like the "air magician" in the sewage treatment industry, using simple physical principles to sweep away all the dirt in the sewage! Whether you are a novice in environmental protection or a skilled operator on site, after reading this article, you are sure to have a clear understanding of it!
1、 What is cavitation air flotation? Let's first take a small example of daily life
Imagine when you are drinking pearl milk tea, with just a sip from your straw, the pearls and milk tea will gurgle upwards. The principle of cavitation air flotation is somewhat similar to this process, except that it uses air as a "suction tube" to "suck" suspended solids in sewage onto the water surface.
In sewage treatment plants, various strange things are often mixed in the sewage: oil, mud, flocs of microorganisms, and even small particles of heavy metals in industrial wastewater. These impurities not only make the water turbid, but may also pollute the environment. The task of cavitation air flotation is to extract these "bad guys" from the water and make the sewage clean!
2、 Core principle revealed: Air+Vortex=Suspended Matter Buster
1. Secret weapon: vortex aerator
The heart of vortex concave air flotation is a device that looks like a large fan - a vortex concave aerator. Its blades are not like ordinary fans, but are specially designed with a "cutting knife" shape. When the motor drives the blades to rotate at high speed, the blades create a super strong negative pressure zone below the water surface. It's like suddenly opening a "vacuum hole" underwater, and the air on the surface of the water will crazily drill into the hole!
2. The birth and growth of bubbles
After entering the negative pressure zone, the air will be instantly cut into countless small bubbles by the rapidly rotating blades. How small are these bubbles? Much thinner than a strand of hair! They are like countless small balloons in the sewage, quickly rising to the surface of the water.
3. Maintenance tips after shutdown
-Washing equipment: After each shutdown, rinse the aerator and scraper with clean water to remove any remaining floating slag and sludge. Don't be lazy! After these dirty things dry, they will become hard and stick to the equipment like cement, making it troublesome to turn them on next time.
-Check vulnerable parts: Regularly check the tightness of the scraper chain and the lubrication of the aerator bearings. If the chain is loose, it should be tightened in a timely manner. If the bearing runs out of oil, add it quickly. If a small problem is not dealt with, it will eventually become a major malfunction.
-Record operational data: develop a good habit of taking notes! Record the inflow water quality, treatment capacity, and equipment operation time every day. These data can help you quickly detect abnormalities, such as a sudden increase in the amount of floating slag, which may be a signal of changes in inflow water quality.
4、 Common problem first aid kit: Don't panic when encountering a malfunction!
-The floating slag layer is too thin: it may be due to insufficient aeration. Check if the aerator speed is normal or if there is any air leakage in the air pipeline.
-Equipment vibration is high: it is mostly due to blade imbalance. After stopping the machine, check whether there is sludge accumulation on the blades and clean them thoroughly to solve the problem.
-The effluent is still turbid: It may be due to incomplete separation of suspended solids. Some flocculants can be added appropriately to help the suspended solids clump together and make it easier for bubbles to "grab" them.
5、 Hidden advantages of vortex concave air flotation
Compared to other air flotation technologies (such as dissolved air flotation), cavitation air flotation is simply a "money saving expert":
-No need for pressurized equipment: No need for a high-pressure pump to pump air into the water, saving electricity and equipment costs.
-Operation is super simple: there are no complicated gas tanks or release devices, and beginners can get started in half a day after training.
-Widely applicable scenarios: Whether it's domestic sewage, food wastewater, or printing and dyeing, chemical wastewater, it can all be easily digested!
Summary: By using vortex concave air flotation clearly, the director of the sewage department can achieve twice the work with half the effort!
Having said so much, there are two core points: first, understanding how bubbles adhere to suspended solids, and second, remembering the operational details and taking good care of the equipment. Vortex concave air flotation is like a "sewage purifier". As long as you master the principle and operate it in a standardized manner, it can easily help you solve the problem of sewage treatment! Next time you see the foam surging on the water, don't just think it is ordinary. What is hidden there is all the magic power to make the sewage clear!
