Which type of reactor is not used for oxidation?

Which of the following reactors is comparable to bubble column bioreactor?

Out of the below given methods in which of these organic matters is stabilized?

While designing a mechanical screen, the clear space between the bars would be in what range?

Which of these is used to remove odour?

What is the size of openings of a coarse screen?

Which type of treatment is the coarse screen?

Which type of reactor is used in ion exchange or adsorption?