Ncert Exercises & Solutions

What would happen if oxygen availability to activated sludge flocs is reduced?

1.	It will slow down the rate of degradation of organic matter.
2.	The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.
3.	Floes would increase in size as anaerobic bacteria would grow around floes.
4.	Protozoa would grow in large numbers.