Question

does the colour of the liquid change after aeration?

And does aeration change the odour of the liquid also?

Answer 1

Part : I
Air is pumped into clarified water to allow the growth aerobic bacteria to grow. These, bacteria consume human waste, food waste, soap which clean the water change its colour also.

Part : II
Wastewater Material such as Large objects like rags, sticks, Solution, plastic packets are removed.Thus yes,it show changes in the odour by decreasing the pollutant from the impure.