Bonjour
What happens during the disinfection step at a wastewater treatment plant?
(i) scum and sludge are separated from the liquid wastewater
(ii) treatment with chlorine or ultraviolet light to kill pathogens > CORRECT
(iii) liquid wastewater is mixed with air to help bacteria breakdown small particles of solid
material
(iv) large solid things are screened out
-
hope it's ok-
-
good evening☺☺☺
