In: Civil Engineering
(a) Microorganisms play a role in the formation of hardness in groundwater. True or false? Explain.
(b) In the United States, chlorine is preferred as a disinfectant
over ozone because it has a residual. Why is the presence of a
residual important? In recent years ozone has been replacing
chlorine as the primary disinfectant in the United States. What are
the advantages and disadvantages of this?