Secondary sewage treatment is distinguished form primary sewage ...

[cool]

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

Question 2

Bioremediation has been particularly effective in marine ecosystems in the clean-up of ________.
 
  A) heavy metals
  B) hydrocarbons
  C) nitrates
  D) pesticides
  E) thermal effluents

[Benayers]

Answer to Question 1

C

Answer to Question 2

B