Materials that are recycled into products of the same type are undergoing ____.
A. primary recycling
B. secondary recycling
C. postconsumer recycling
D. industrial recycling
E. open loop recycling
Answer: A
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A) about the same B) higher C) very constant D) highly variable E) lower
The trickling-filter system and the activated-sludge systems in wastewater treatment both require
a. the addition of large amounts of chlorine to kill pathogens. b. the addition of large amounts of ammonia as nutrients to support decomposers. c. high levels of oxygen to promote aerobic decomposition. d. high levels of carbon dioxide to adjust the pH of the water for bacterial action.
The new center of finance and banking in Shanghai is
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