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Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
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Alamojay Alamojay
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9 years ago
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.
Textbook 
Environmental Science: Toward A Sustainable Future

Environmental Science: Toward A Sustainable Future


Edition: 12th
Authors:
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Super Cuban Dude
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JesuisMelJesuisMel
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9 years ago
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Alamojay Author
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9 years ago
this is exactly what I needed
sudenzia
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Gamiung3657
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2 hours ago
Helped a lot
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