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Dorroco aerator is a type of ___________

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Dorroco aerator is a type of ___________

(a) Combined aerator

(b) Mechanical aerator

(c) Ridge and furrow type aerator

(d) Spiral flow type aerator

The question was asked during a job interview.

This is a very interesting question from Mechanical Aeration System, Treatment of Sludge in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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The correct choice is (a) Combined aerator

To elaborate: Dorroco aerator is a  type of combined aerator which is efficient in comparison to diffused air and mechanical aerator.

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