Removal of environmental pollutants using microorganisms is called __________.
or
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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
Q21: Activated sludge is used in which sewage
Q22: Which of the following is not an
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
Q27: Which causes the most stress to overloaded
Q28: Purification of waters while generating power and
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