Gravity thickening can achieve up to _____ solid fraction.

What is the wastewater called as after physical and biological removal of solids?

Which of the following is not a standard condition for aeration?

The sludge particles concentration is increased by the growth of the organism in aeration tanks.

How is air pumped in the aerator unit?

_________ is the actual mass of oxygen transferred per unit time.

Which of the following methods is used in both dewatering and thickening?

What is autotrophic biomass made up of?