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Venturi
Injection vs. Bubble Diffusers
Venturi Injectors
(Injectors) work
by forcing water through a conical body which initiates a pressure differential
between the inlet and outlet ports. This creates a vacuum inside the
injector body, which initiates ozone suction through the suction port.
Characteristics:
 |
very
high ozone mass transfer rate (up to 90%) |
|
requires
water pump to initiate suction |
|
efficiency
rarely decreases over time |
|
no
moving parts |
Air being sucked into a venturi/injector - notice the
thousands of small bubbles present after the suction port.
Injectors produce thousands of bubbles greatly increasing the surface area of
oxygen, or ozone, in contact with the water. (Two small bubbles have
greater surface are than one large bubble of the same volume.) This
results in a very high mass transfer rate.
Bubble
Diffusers work by emitting ozone through hundreds of bubbles beneath the waters surface.
Characteristics:
|
low
ozone mass transfer rate (typically around 10-15%) |
|
efficiency
increases with increased water depth |
|
requires
air-pump to transfer oxygen below surface |
|
diffuser
holes become fouled decreasing transfer efficiency |
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