Secondary Sewage Treatment Is Distinguished Form Primary Sewage Treatment by The

Multiple Choice

Secondary sewage treatment is distinguished form primary sewage treatment by the:

A) addition of bacteria to process organic contaminants.
B) aeration of liquid effluent following chlorination.
C) chlorination of the liquid effluent.
D) removal of inorganic nutrients from the liquid effluent.
E) separation of the suspended solids from the liquid effluent.