Talk:Dissolved gas flotation

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This page appears to deduce logical conclusions that do not point to factual reasoning for support i.e. "Therefore, the smaller the gas bubbles created the smaller the oil droplet floated to the surface". My experience is that minute oil droplets will also attach to large air bubbles.

The above quoted sentence from the article is not well supported by the general experience of Industry experts. For instance the general understanding for minute air bubbles is that as the air bubble decreases in size the surface charge on the air bubble tends towards being negative (this phenomenon being more associated with Dissolved Air Flotation [DAF] since the air bubble in DAF starts off at sub 1 micron sizes) - REFERENCE "The Nalco Water Handbook 2nd Edition, McGraw-Hill Book Company, Page 9.17". This would mean that as the oil particle and air particle tended smaller in size they will tend to electrostatically repel each other.

Another sentence in the article that may require modification (unless well referenced) is "The bubble size ranges from 50 to 1 micron or less". Does this mean 0-50 micron? Only DAF will be able to come close to achieving this (see previous paragraph). It is unlikely that cutting up large air bubbles with a propeller to make them smaller (like the DGF pump) will result in sub 10 micron sized air bubbles (no reference- sorry!) BluesLewis (talk) 23:25, 18 February 2013 (UTC)