Rotating biological contactors treat waste streams using a thin film of
aerobic microorganisms on rotating cylinders. The rate of rotation is selected and
controlled to provide optimum oxygen levels and contact with the waste stream.
This method has been demonstrated to be especially effective for alcohols, phenols, phthalates, cyanides, and ammonia.
It is generally effective for aqueous wastes where concentrations are less than 1%. As with all biological treatment, it requires stable, consistent operating conditions.
The rotating biological contactors method isn't suitable for highly chlorinated organics, aliphatics, amines, and aromatic compounds. Heavy metals and organic chemicals may kill the microorganisms. Heavy metals and non-biodegradable organics may also concentrate in the sludge. Hydrogen sulfide gas may also be released.
