0
1
Infinity
None of the above
Answer is Right!
Answer is Wrong!
The correct answer is A. 0.
The recirculation factor is a dimensionless number that is used to describe the amount of sewage that is recirculated back into the treatment process. It is calculated by dividing the volume of recirculated sewage by the volume of influent sewage. When there is no recirculation of sewage, the recirculation factor is 0.
Option B is incorrect because the recirculation factor cannot be greater than 1. Option C is incorrect because the recirculation factor cannot be infinity. Option D is incorrect because there is a correct answer to the question.