Which of the following is/are by-product(s) of wastewater treatment?
Which among the following are the by-products of wastewater treatment?
Which one of the following is not a step in wastewater treatment?
Question 3
Which of the following is/are products of wastewater treatment? (a) Biogas (b) Sludge (c) Both biogas and sludge (d) Aerator