Which of these is not a type of grit chamber

What is the percentage of dry solids assumed for the sludge at the outlet of a centrifuge?

Which bioreactor is designed for fermentation?

Which of these is used to remove odour?

What is the temperature at which sludge has to be frozen in order to carry out conditioning?

What is the % of dry solids assumed for a primary sludge from a settling tank at the outlet?

What is the maximum approach velocity to be considered for a mechanical screen while designing it?

Secondary sludge includes treated sewage sludge.