The recovery zone of polluted natural waters is characterized by
A) rising Biological Oxygen Demand (BOD) and rising Dissolved Oxygen concentration (DO)
B) decreasing Biological Oxygen Demand (BOD) and rising Dissolved Oxygen concentration (DO)
C) rising Biological Oxygen Demand (BOD) and decreasing Dissolved Oxygen concentration
D) decreasing Biological Oxygen Demand (BOD) and decreasing Dissolved Oxygen concentration (DO)
Correct Answer:
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Q21: Secondary sewage treatment is focused on
A)disinfection to
Q22: Sediment (soil particles) in natural waters can
A)
Q23: Tertiary sewage treatment is primarily focused on
A)reducing
Q24: The amount of oxygen required to decompose
Q25: The coastal zones of the earth's oceans
Q26: The rapid decrease of dissolved oxygen in
Q28: The "river that burned" was the
A)Cuyahoga River
B)Mississippi
Q29: The zone of the open sea having
Q30: Wastewater treatment sludge, after reduction to about
Q31: Water pollution can be
A)biological
B)chemical
C)biological or chemical
D)visible but
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