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Aeration of sea water with three different aeration devices at the same air flow rate (1 L/min.)

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Porous resin airstone

Mili-bubbles are released from innumerous fine pores with about 150 µm of the airstone made of resins, and rise up in the water vigorously.

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Micro-bubble diffuser

Fine bubbles of 100 to 500 µm are released from the porous ceramic plate, but go up toward the water surface rapidly.

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eco-Bubble-400

Micro-bubbles of about 14 µm are emitted from the nozzle with DDHRS. They look like a mist in the water, floating in the water.

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Micro-bubbles (referred to as fine bubbles of less than 50 µm of diameter) tend to be suspended in the water for a long time due to extremely low buoyancy.

DDHRS Nozzle of eco-Bubble can create not only micro-bubbles (approximately 14 µm of mean diameter) but also nano-bubbles (approximately 0.2 µm of mean diameter) at the same time (Hu & Xia (2018)).

Remarks) The sizes of the bubbles released from the nozzle changes markedly, depending on the water conditions.

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