Question

The tolerance limit of pH value of sewage to be discharged into sea water is ____________

(a) 1-5ppm

(b) 2-9ppm

(c) 5.5-9ppm

(d) 6-10ppm

I had been asked this question in a job interview.

I would like to ask this question from Disposal of Sewage in section Natural Methods of Wastewater Disposal of Environmental Engineering

Answer 1

Correct option is (c) 5.5-9ppm

The best I can explain: The tolerance limit of pH value of sewage to be discharged into sea water or to be disposed on land is between 5.5 and 9ppm.