An air diffuser or membrane diffuser is an aeration device typically in the shape of a disc, tube or plate, which is used to transfer air and with that oxygen into the sewage or industrial wastewater.Since fine-bubble diffusers have about double the oxygen transfer rate of typical coarse-bubble diffusers, they only require about half of the air required from the blowers to accomplish the same amount of aeration as coarse-bubble systems. Therefore, converting to fine-bubble diffusers is best suited for aeration systems equipped with variable frequency drives which allow the blower to decrease the amount of air discharged.
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