Fine bubble air, Micro diffuser & aeration in wastewater treatment

 Fine bubble diffuser: Fine bubble diffusers produce a plethora of very small air bubbles which rise slowly from the floor of a wastewater treatment plant or sewage treatment plant aeration tank and provide substantial and efficient mass transfer of oxygen to the water.The oxygen, combined with the food source, sewage, allows the bacteria to produce enzymes which help break down the waste so that it can settle in the secondary clarifiers or be filtered by membranes. A fine bubble diffuser is commonly manufactured in various forms: tube, disc, plate, and dome. PROFLEX Diffused Aeration Waste water Products and Systems offer many options on the type of diffusers and materials of construction. Our years of experience allow us to provide the industry with valuable input on solutions for all types of waste water aeration applications including unique tank geometries and difficult process applications. (a) A unique attachment system significantly reduces installation time.(b) Any diffuser length is available to suit the needs of each application.(c) Highest quality EPDM rubber. (d) Attachment system eliminates structural concerns of many other (e) tube diffuser designs. (f) Suitable for off/on applications. (g) Diffusers are factory assembled for easy installation.

Micro Bubble Diffuser: Size of the bubbles can drastically influence the oxygen transfer efficiency in the aeration system. Smaller bubbles increase OTR exponentially Gasion aerator generates micro bubbles with low rising velocity and high surface area. Gasion hydrodynamic aerators produce millions of bubbles in micron sizes which have much larger surface area, compared to millimetre bubbles of diffused aerators. The size is so minute that it cannot travel up to the surface in a straight path. The very low buoyancy of the micro bubbles creates zig-zag path of bubbles moving horizontally more than the vertical distance. This increases the residence time of these bubbles in liquid drastically. The figure illustrates and compares the air bubble size and rising phenomenon of millimetre and micron sized bubbles. It could be noted that millimetre sized bubbles travel up and burst outside on the surface. But the Gasion micron sized bubbles burst inside the liquid itself as it takes much longer before it reaches the top. This bubble burst in liquid accounts for very high OTR of the Gasion Aerators.



Fine bubble and coarse bubble diffusers: Though fine bubble diffuser and coarse bubble diffusers both work through bubble aeration, it’s important to identify some distinguishing features of their design and function to determine which is appropriate. Fine bubble membrane diffusers produce a smaller-diameter bubble for the aeration process. These bubbles typically measure 1 to 3 mm in diameter. This fine bubble aeration usually provides 2% or more Standard Oxygen Transfer Efficiency (SOTE) during aeration. Fine bubble diffusers come in a range of diameters themselves. At SSI Aeration, Inc., we offer 7-, 9- and 12-inch fine bubble diffusers designed for performance and durability in municipal and industrial use. Coarse air bubble diffusers, in contrast, produce a larger diameter of bubble to displace, churn and mix the wastewater effectively. Coarse bubble aeration typically provides 1% or less SOTE during aeration. At SSI, we offer a range of coarse bubble diffusers at a variety of price points to ensure our long-lasting products, engineered to the highest standards, can fill every type of need.

Aeration diffuser: Diffusers are typically connected to a piping system which is supplied with pressurized air by a blower. This system is commonly referred to as a diffused aeration system or aeration grid. There are two main types of diffused aeration systems, retrievable and fixed grid, that are designed to serve different purposes. In the case of a plant with a single tank, a retrievable system is desirable, in order to avoid stopping operation of the plant when maintenance is required on the aeration system. Fixed systems, on the other hand, are typically less costly, and often more efficient because it is easier to make full use of the floor. Durable, efficient diffusers from Grainger can deliver valuable water aeration and oxygenation in residential, municipal and industrial water and wastewater treatment applications. Fine-bubble diffuser tubes and disks can provide a high oxygen transfer rate. Use a diffuser with ballast assembly to help aerate shallow ponds, ornamental water features, grease traps and other small tanks. Rely on Grainger for coarse and fine bubble diffusers in a variety of sizes to help fit your application.

Construction and Operation: The Gasion hydrodynamic mixers are constructed of engineering plastics and can be used as high volume air diffusers. Compressed air enters at the bottom of the diffuser assembly through an ejector device creating vacuum which draws in large amount of water through the aerator body. The water and air mixture gets mixed thoroughly in a vane type arrangement and then the air is fractured into micro bubbles in a set of mushroom type bubble breaker device which forcibly dissolve oxygen into water. Circulating flows are formed by powerful upward air flows which evenly churn the entire tank resulting in high agitation and oxygen transfer. Volume of activated sludge sucked into the aerator is about 1.3 times than the air supplied because of strong negative pressure created in the ejector assembly.Air discharge opening is about 30mm and so operated without any clogging issues even in liquid with large particles.

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