Question

1)The process of digestion happens at which stage of waste water?
a.Primary
b.secondary
c.tertiary
d.none of these
2)Which of the following does not contribute to algal bloom?
a.Runoffa from agriculture fields
b.Runoffs from urban lawns
c.Untreted domestic water
d. Drinking water
3)Which of these following is used for disinfecting water?
a.Ozone
b.phosphus
c.Potassium
d.Flourine

_Answer one word
4) Light wastes that rise to the top and float during primary treatment of water._________


please answers fast I will mark you brainlist and don't give wrong anwers​

Answer 1

Answer:

1.(b) secondary

2.(d) drinking water

3. the options are wrong cause the answer is "chlorine"

Explanation: