Foaming phenomenon may appear during the commissioning procedures of bio-reactors. Also, high variations in organic loads can cause foaming. Foaming is caused by the surface tension of the wastewater. Foaming during commissioning can be reduced by reducing the volume of air blown and by reducing the loads. Foaming in a fully developed environment can be reduced by recirculating some wastewater.
The foaming phenomenon should not occur in a well-sized bioreactor operating under normal load and temperature conditions. However, due to the load of specific substances, foaming may occasionally occur. The foaming phenomenon during normal operation can be controlled either by spraying water under pressure to the surface of the bio-reactors in which a small amount of antifoam is added or by adding anti-foaming substances without dilution.
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