Activated sludge is used in which sewage treatment step?
A) Primary
B) Secondary
C) Tertiary
D) All of these choices are correct.
Correct Answer:
Verified
Q16: Rapid sand filtration,used in many water purification
Q17: Potable water is unfit for consumption or
Q18: Potable water
A)requires boiling to make it safe
Q19: Chlorination alone will usually suffice to inactivate
Q20: The membrane filter technique can be used
Q22: Which of the following is not an
Q23: Removal of environmental pollutants using microorganisms is
Q24: Secondary treatment of sewage involves the use
Q25: Sewage treatment that involves horizontal flow in
Q26: The biochemical oxygen demand (BOD)test is primarily
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