Question

What happens during the clarification or separation step at a wastewater treatmentplant?

A. large solid things are screened out

B. scum and sludge are separated from the liquid wastewater

C. treatment with chlorine or ultraviolet light to kill pathogens

D. liquid wastewater is mixed with air to help bacteria breakdown small particles of solid material​

Answer 1

Answer:

{B} scum and sludge are separated from the liquid wastewater  

Explanation:

The clarifier works by permitting the heavier and larger particles to settle to the bottom of the clarifier. The particles then form a bottom layer of sludge requiring regular removal and disposal. Clarified water then proceeds through several more steps before being sent for storage and use.

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