The Trickling-Filter System and the Activated-Sludge System Both Require

question 53

Multiple Choice

The trickling-filter system and the activated-sludge system both require

• A)high levels of oxygen to promote aerobic decomposition.
• B)high levels of carbon dioxide to adjust the pH of the water for bacterial action.
• C)the addition of large amounts of chlorine to kill pathogens.
• D)the addition of large amounts of ammonia as nutrients to support decomposers.

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