Question

what changes did you observe in the appearance of the liquid after aeration?

Answer 1

the colour of the liquid is changed after aeration .

air is pumped into clarified water to allow the growth of aerobic bacteria .

thus, aerobic bacteria consume the waste , therefore , cleaning the water resulting in the change in colour of the liquid

Answer 2

Answer:

The colour of liquid is changed after aeration. 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.