Product Information
The aeration equipment series is core hardware in the biological stage of wastewater treatment. Its main job is to inject oxygen into the water for aerobic microbes to breathe and break down organic matter. Water treatment aeration equipment comes in many types, commonly including fine bubble diffusers, vortex aerators, tubular diffusers, and submersible aerators. They transfer oxygen from the air into the water through air diffusion or mechanical mixing—essentially acting as aeration and oxygenation devices. Selection mainly depends on tank type, water depth, oxygen demand, and energy requirements.
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Working Principle
Take the commonly used fine bubble diffuser as an example. Compressed air from the blower enters the diffusers at the bottom of the tank through pipes. The air passes through tiny pores in the diffuser discs or tubes, forming lots of fine bubbles. As the bubbles rise, oxygen gradually dissolves into the water. The fine pore design increases the gas-liquid contact area and oxygen transfer efficiency, while also driving a vertical circulation of the tank water. Submersible aerators work differently: a high-speed impeller creates negative pressure to draw in air, and the water's shear force breaks the bubbles apart, providing both aeration and mixing. The core metric for aeration devices is oxygen transfer efficiency—how much oxygen actually ends up dissolved in the water.
Application Fields
1.Municipal wastewater: oxygenation of aerobic tanks in activated sludge processes (like A/O, A²/O, SBR).
2.Industrial wastewater: aerobic biological treatment for chemical, printing and dyeing, and papermaking wastewater to improve biodegradability.
3.Black-odor water bodies: in-situ river restoration to raise dissolved oxygen and get rid of foul odors.
4.Aquaculture: bottom aeration in high-density ponds to prevent fish and shrimp from gasping at the surface.
FAQ
Q1: What's the difference between a fine bubble diffuser and a vortex aerator?
A: Fine bubble diffusers produce tiny bubbles with high oxygen transfer efficiency, but they clog easily and demand higher water quality. Vortex aerators use water shear to create bubbles, resist clogging, and suit high-suspended-solids wastewater, but they have higher resistance and energy consumption. The choice depends on water quality and operating costs.
Q2: What affects the oxygen transfer efficiency of aeration equipment?
A: Mainly water depth, temperature, bubble size, and water quality. Deeper water means longer contact time between bubbles and water, boosting efficiency. Colder water holds more dissolved oxygen. Smaller bubbles have a larger specific surface area for faster mass transfer. Also, oil or surfactants in the water can hinder oxygen transfer.
Q3: Why do diffuser discs crack or age?
A: Diffuser discs are commonly made of rubber membranes or corundum. Rubber membranes become brittle and age under long-term sunlight, ozone, or chemical exposure. If there's no backflow prevention when the blower stops, wastewater can flow back into the air pipes and damage the membrane. Corundum discs are wear-resistant but can crack under uneven stress or poor installation.