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20.6: Eutrophication and Dead Zones
https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/20%3A_Biogeochemical_Cycles/20.06%3A_Eutrophication_and_Dead_Zones
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17.2E: Sewage Treatment
https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/17%3A_Ecology/17.02%3A_Cycles_of_Matter_in_the_Biosphere/17.2E%3A_Sewage_Treatment
This page discusses the U.S. waste management system, where 60% of waste is collected by sewers using 14 billion gallons of water daily, with 10% untreated discharge. It explains Biochemical Oxygen De...This page discusses the U.S. waste management system, where 60% of waste is collected by sewers using 14 billion gallons of water daily, with 10% untreated discharge. It explains Biochemical Oxygen Demand (BOD) related to organic matter, emphasizing the importance of keeping BOD below 1 for drinking water. The sewage treatment process includes primary, secondary, and optional tertiary treatments to reduce BOD and nutrients.
20.3: Eutrophication and Dead Zones
https://bio.libretexts.org/Workbench/General_Ecology_Ecology/Chapter_20%3A_Biogeochemical_Cycles/20.3%3A_Eutrophication_and_Dead_Zones
.

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